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  • Graphite Running using daemon tools getting defunct

    - by pradeepchhetri
    I am running carbon-cache.py and carbon-aggregator.py using daemon tools. When I made some changes in the storage-schema.conf and tried to restart the carbon-cache.py, I found that it is becoming zombie very frequently. root 3367 3366 0 03:23 pts/1 00:00:00 supervise carbon-aggregator root 3371 3366 0 03:23 pts/1 00:00:00 supervise carbon-cache root 3373 3367 3 03:23 pts/1 00:00:02 /usr/bin/python /usr/bin/carbon-aggregator.py --debug start root 3379 3372 0 03:23 pts/1 00:00:00 multilog t /var/log/multilog/carbon-cache root 3382 3368 0 03:23 pts/1 00:00:00 multilog t /var/log/multilog/carbon-aggregator root 3638 3371 21 03:24 pts/1 00:00:00 [carbon-cache.py] <defunct> Can someone tell me what may be the reason ?

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  • Pre-Loading von Tabellen in 11g

    - by Ulrike Schwinn (DBA Community)
    Tabellen und Indizes in den Cache zu laden, damit möglichst wenig I/O durchgeführt wird, ist eine häufig anzutreffende Anforderung. Diese Technik nennt man auch Pre-Loading oder Pre-Caching von Datenbank Objekten. Die Durchführung ist dabei sehr einfach. Gleich zu Beginn werden spezielle SQL Statements wie SELECT Statements mit Full Table Scan oder Index Scan durchgeführt, damit die entsprechenden Objekte vollständig in den Cache geladen werden können. Besonders interessant ist dieser Aspekt auch im Zusammenhang mit der Erstellung von Testumgebungen. Falls beispielsweise kein Warmup möglich ist, kann man bevor der eigentliche Test durchgeführt wird, bestimmte Tabellen und Indizes mit dieser Technik vorab in den Buffer Cache laden.  Der folgende Artikel zeigt wie man eine Tabelle in 11g in den Buffer Cache laden kann und gibt Tipps zur Durchführung.

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  • last-modified/etags - to include or not?

    - by Kae Verens
    Google's PageSpeed plugin suggests that a website should include Last-Modified and ETag headers: Specify a cache validator "Resources that do not specify a cache validator cannot be refreshed efficiently. Specify a Last-Modified or ETag header to enable cache validation" However, Apache suggests that by not including them at all, we speed up websites by eliminating If-Modified-Since and If-None-Match requests: http://www.askapache.com/htaccess/apache-speed-last-modified.html these are in direct opposition - which should be implemented? I'm leaning towards Apache's suggestion, as when I want a file cached, I don't want it refreshed.

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  • Best practices for setting lm-factor in Squid refresh patterns

    - by Mpentecost
    I am running a Squid (3.1) cache in front of Django. The content of the site does not change very often, so Squid gives our backend much needed breathing room. Currently, this is the refresh pattern that we are using to cache the content: refresh_pattern . 60 100% 60 We basically want to cache everything for at least an hour (and only an hour) before Squid then re-validates the content. My question is on the "100%" parameter, which sets the lm-factor. I'm not sure if setting that to 100% is doing what we want it to. The assumption was that by setting it to 100%, it would ensure that objects stay in the cache for the max cache time. Is this an incorrect assumption? What are the best practices that one should follow when setting up a refresh pattern like this?

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  • this error appeared when upgrating 12.04 LTS to 12.10 [closed]

    - by habcity
    Possible Duplicate: How do I fix a “Problem with MergeList” error when trying to do an update? ryder@ryder-Q1500M:~$ do-release-upgrade Checking for a new Ubuntu release Get:1 Upgrade tool signature [198 B] Get:2 Upgrade tool [1,200 kB] Fetched 1,200 kB in 6s (6,988 B/s) authenticate 'quantal.tar.gz' against 'quantal.tar.gz.gpg' extracting 'quantal.tar.gz' [sudo] password for ryder: Reading cache A fatal error occurred Please report this as a bug and include the files /var/log/dist-upgrade/main.log and /var/log/dist-upgrade/apt.log in your report. The upgrade has aborted. Your original sources.list was saved in /etc/apt/sources.list.distUpgrade. Traceback (most recent call last): File "/tmp/update-manager-63XThv/quantal", line 10, in sys.exit(main()) File "/tmp/update-manager-63XThv/DistUpgrade/DistUpgradeMain.py", line 237, in main save_system_state(logdir) File "/tmp/update-manager-63XThv/DistUpgrade/DistUpgradeMain.py", line 130, in save_system_state scrub_sources=True) File "/tmp/update-manager-63XThv/DistUpgrade/apt_clone.py", line 146, in save_state self._write_state_installed_pkgs(sourcedir, tar) File "/tmp/update-manager-63XThv/DistUpgrade/apt_clone.py", line 173, in _write_state_installed_pkgs cache = self._cache_cls(rootdir=sourcedir) File "/usr/lib/python2.7/dist-packages/apt/cache.py", line 102, in init self.open(progress) File "/usr/lib/python2.7/dist-packages/apt/cache.py", line 145, in open self._cache = apt_pkg.Cache(progress) SystemError: E:Encountered a section with no Package: header, E:Problem with MergeList /var/lib/apt/lists/us.archive.ubuntu.com_ubuntu_dists_precise-backports_multiverse_i18n_Translation-en, E:The package lists or status file could not be parsed or opened.

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  • Avoiding and Identifying False Sharing Among Threads

    In symmetric multiprocessor (SMP) systems, each processor has a local cache. The memory system must guarantee cache coherence. False sharing occurs when threads on different processors modify variables that reside on the same cache line. Learn methods to detect and correct false sharing.

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  • dpkg snippet isn't working for me when fixing / installing dockbar

    - by user3924
    I'm trying to use this code from webupd8 to fix the problem I have. It seems it didn't work. sudo dpkg -i --force-overwrite /var/cache/apt/archives/smplayer_0.6.9+svn3595-1ppa1~maverick1_i386.deb Here is the output from my attempt to install dockbar : $ sudo dpkg -i --force-all var/apt/cache/archives/dockmanager_0.1.0~bzr80-0ubuntu1~10.10~dockers1_i386.deb dpkg: error processing var/apt/cache/archives/dockmanager_0.1.0~bzr80-0ubuntu1~10.10~dockers1_i386.deb (--install): cannot access archive: No such file or directory Errors were encountered while processing: var/apt/cache/archives/dockmanager_0.1.0~bzr80-0ubuntu1~10.10~dockers1_i386.deb Is there any way around this?

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  • Using Bulk Operations with Coherence Off-Heap Storage

    - by jpurdy
    Some NamedCache methods (including clear(), entrySet(Filter), aggregate(Filter, …), invoke(Filter, …)) may generate large intermediate results. The size of these intermediate results may result in out-of-memory exceptions on cache servers, and in some cases on cache clients. This may be particularly problematic if out-of-memory exceptions occur on more than one server (since these operations may be cluster-wide) or if these exceptions cause additional memory use on the surviving servers as they take over partitions from the failed servers. This may be particularly problematic with clusters that use off-heap storage (such as NIO or Elastic Data storage options), since these storage options allow greater than normal cache sizes but do nothing to address the size of intermediate results or final result sets. One workaround is to use a PartitionedFilter, which allows the application to break up a larger operation into a number of smaller operations, each targeting either a set of partitions (useful for reducing the load on each cache server) or a set of members (useful for managing client result set sizes). It is also possible to return a key set, and then pull in the full entries using that key set. This also allows the application to take advantage of near caching, though this may be of limited value if the result is large enough to result in near cache thrashing.

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  • Issue accessing remote Infinispan mbeans

    - by user1960172
    I am able to access the Mbeans by local Jconsole but not able to access the MBEANS from a remote Host. My COnfiguration: <?xml version='1.0' encoding='UTF-8'?> <server xmlns="urn:jboss:domain:1.4"> <extensions> <extension module="org.infinispan.server.endpoint"/> <extension module="org.jboss.as.clustering.infinispan"/> <extension module="org.jboss.as.clustering.jgroups"/> <extension module="org.jboss.as.connector"/> <extension module="org.jboss.as.jdr"/> <extension module="org.jboss.as.jmx"/> <extension module="org.jboss.as.logging"/> <extension module="org.jboss.as.modcluster"/> <extension module="org.jboss.as.naming"/> <extension module="org.jboss.as.remoting"/> <extension module="org.jboss.as.security"/> <extension module="org.jboss.as.threads"/> <extension module="org.jboss.as.transactions"/> <extension module="org.jboss.as.web"/> </extensions> <management> <security-realms> <security-realm name="ManagementRealm"> <authentication> <local default-user="$local"/> <properties path="mgmt-users.properties" relative-to="jboss.server.config.dir"/> </authentication> </security-realm> <security-realm name="ApplicationRealm"> <authentication> <local default-user="$local" allowed-users="*"/> <properties path="application-users.properties" relative-to="jboss.server.config.dir"/> </authentication> </security-realm> </security-realms> <management-interfaces> <native-interface security-realm="ManagementRealm"> <socket-binding native="management-native"/> </native-interface> <http-interface security-realm="ManagementRealm"> <socket-binding http="management-http"/> </http-interface> </management-interfaces> </management> <profile> <subsystem xmlns="urn:jboss:domain:logging:1.2"> <console-handler name="CONSOLE"> <level name="INFO"/> <formatter> <pattern-formatter pattern="%K{level}%d{HH:mm:ss,SSS} %-5p [%c] (%t) %s%E%n"/> </formatter> </console-handler> <periodic-rotating-file-handler name="FILE" autoflush="true"> <formatter> <pattern-formatter pattern="%d{HH:mm:ss,SSS} %-5p [%c] (%t) %s%E%n"/> </formatter> <file relative-to="jboss.server.log.dir" path="server.log"/> <suffix value=".yyyy-MM-dd"/> <append value="true"/> </periodic-rotating-file-handler> <logger category="com.arjuna"> <level name="WARN"/> </logger> <logger category="org.apache.tomcat.util.modeler"> <level name="WARN"/> </logger> <logger category="org.jboss.as.config"> <level name="DEBUG"/> </logger> <logger category="sun.rmi"> <level name="WARN"/> </logger> <logger category="jacorb"> <level name="WARN"/> </logger> <logger category="jacorb.config"> <level name="ERROR"/> </logger> <root-logger> <level name="INFO"/> <handlers> <handler name="CONSOLE"/> <handler name="FILE"/> </handlers> </root-logger> </subsystem> <subsystem xmlns="urn:infinispan:server:endpoint:6.0"> <hotrod-connector socket-binding="hotrod" cache-container="clustered"> <topology-state-transfer lazy-retrieval="false" lock-timeout="1000" replication-timeout="5000"/> </hotrod-connector> <memcached-connector socket-binding="memcached" cache-container="clustered"/> <!--<rest-connector virtual-server="default-host" cache-container="clustered" security-domain="other" auth-method="BASIC"/> --> <rest-connector virtual-server="default-host" cache-container="clustered" /> <websocket-connector socket-binding="websocket" cache-container="clustered"/> </subsystem> <subsystem xmlns="urn:jboss:domain:datasources:1.1"> <datasources/> </subsystem> <subsystem xmlns="urn:infinispan:server:core:5.3" default-cache-container="clustered"> <cache-container name="clustered" default-cache="default"> <transport executor="infinispan-transport" lock-timeout="60000"/> <distributed-cache name="default" mode="SYNC" segments="20" owners="2" remote-timeout="30000" start="EAGER"> <locking isolation="READ_COMMITTED" acquire-timeout="30000" concurrency-level="1000" striping="false"/> <transaction mode="NONE"/> </distributed-cache> <distributed-cache name="memcachedCache" mode="SYNC" segments="20" owners="2" remote-timeout="30000" start="EAGER"> <locking isolation="READ_COMMITTED" acquire-timeout="30000" concurrency-level="1000" striping="false"/> <transaction mode="NONE"/> </distributed-cache> <distributed-cache name="namedCache" mode="SYNC" start="EAGER"/> </cache-container> <cache-container name="security"/> </subsystem> <subsystem xmlns="urn:jboss:domain:jca:1.1"> <archive-validation enabled="true" fail-on-error="true" fail-on-warn="false"/> <bean-validation enabled="true"/> <default-workmanager> <short-running-threads> <core-threads count="50"/> <queue-length count="50"/> <max-threads count="50"/> <keepalive-time time="10" unit="seconds"/> </short-running-threads> <long-running-threads> <core-threads count="50"/> <queue-length count="50"/> <max-threads count="50"/> <keepalive-time time="10" unit="seconds"/> </long-running-threads> </default-workmanager> <cached-connection-manager/> </subsystem> <subsystem xmlns="urn:jboss:domain:jdr:1.0"/> <subsystem xmlns="urn:jboss:domain:jgroups:1.2" default-stack="${jboss.default.jgroups.stack:udp}"> <stack name="udp"> <transport type="UDP" socket-binding="jgroups-udp"/> <protocol type="PING"/> <protocol type="MERGE2"/> <protocol type="FD_SOCK" socket-binding="jgroups-udp-fd"/> <protocol type="FD_ALL"/> <protocol type="pbcast.NAKACK"/> <protocol type="UNICAST2"/> <protocol type="pbcast.STABLE"/> <protocol type="pbcast.GMS"/> <protocol type="UFC"/> <protocol type="MFC"/> <protocol type="FRAG2"/> <protocol type="RSVP"/> </stack> <stack name="tcp"> <transport type="TCP" socket-binding="jgroups-tcp"/> <!--<protocol type="MPING" socket-binding="jgroups-mping"/>--> <protocol type="TCPPING"> <property name="initial_hosts">10.32.50.53[7600],10.32.50.64[7600]</property> </protocol> <protocol type="MERGE2"/> <protocol type="FD_SOCK" socket-binding="jgroups-tcp-fd"/> <protocol type="FD"/> <protocol type="VERIFY_SUSPECT"/> <protocol type="pbcast.NAKACK"> <property name="use_mcast_xmit">false</property> </protocol> <protocol type="UNICAST2"/> <protocol type="pbcast.STABLE"/> <protocol type="pbcast.GMS"/> <protocol type="UFC"/> <protocol type="MFC"/> <protocol type="FRAG2"/> <protocol type="RSVP"/> </stack> </subsystem> <subsystem xmlns="urn:jboss:domain:jmx:1.1"> <show-model value="true"/> <remoting-connector use-management-endpoint="false"/> </subsystem> <subsystem xmlns="urn:jboss:domain:modcluster:1.1"> <mod-cluster-config advertise-socket="modcluster" connector="ajp" excluded-contexts="console"> <dynamic-load-provider> <load-metric type="busyness"/> </dynamic-load-provider> </mod-cluster-config> </subsystem> <subsystem xmlns="urn:jboss:domain:naming:1.2"/> <subsystem xmlns="urn:jboss:domain:remoting:1.1"> <connector name="remoting-connector" socket-binding="remoting" security-realm="ApplicationRealm"/> </subsystem> <subsystem xmlns="urn:jboss:domain:security:1.2"> <security-domains> <security-domain name="other" cache-type="infinispan"> <authentication> <login-module code="Remoting" flag="optional"> <module-option name="password-stacking" value="useFirstPass"/> </login-module> <login-module code="RealmUsersRoles" flag="required"> <module-option name="usersProperties" value="${jboss.server.config.dir}/application-users.properties"/> <module-option name="rolesProperties" value="${jboss.server.config.dir}/application-roles.properties"/> <module-option name="realm" value="ApplicationRealm"/> <module-option name="password-stacking" value="useFirstPass"/> </login-module> </authentication> </security-domain> <security-domain name="jboss-web-policy" cache-type="infinispan"> <authorization> <policy-module code="Delegating" flag="required"/> </authorization> </security-domain> </security-domains> </subsystem> <subsystem xmlns="urn:jboss:domain:threads:1.1"> <thread-factory name="infinispan-factory" group-name="infinispan" priority="5"/> <unbounded-queue-thread-pool name="infinispan-transport"> <max-threads count="25"/> <keepalive-time time="0" unit="milliseconds"/> <thread-factory name="infinispan-factory"/> </unbounded-queue-thread-pool> </subsystem> <subsystem xmlns="urn:jboss:domain:transactions:1.2"> <core-environment> <process-id> <uuid/> </process-id> </core-environment> <recovery-environment socket-binding="txn-recovery-environment" status-socket-binding="txn-status-manager"/> <coordinator-environment default-timeout="300"/> </subsystem> <subsystem xmlns="urn:jboss:domain:web:1.1" default-virtual-server="default-host" native="false"> <connector name="http" protocol="HTTP/1.1" scheme="http" socket-binding="http"/> <connector name="ajp" protocol="AJP/1.3" scheme="http" socket-binding="ajp"/> <virtual-server name="default-host" enable-welcome-root="false"> <alias name="localhost"/> <alias name="example.com"/> </virtual-server> </subsystem> </profile> <interfaces> <interface name="management"> <inet-address value="${jboss.bind.address.management:10.32.222.111}"/> </interface> <interface name="public"> <inet-address value="${jboss.bind.address:10.32.222.111}"/> </interface> </interfaces> <socket-binding-group name="standard-sockets" default-interface="public" port-offset="${jboss.socket.binding.port-offset:0}"> <socket-binding name="management-native" interface="management" port="${jboss.management.native.port:9999}"/> <socket-binding name="management-http" interface="management" port="${jboss.management.http.port:9990}"/> <socket-binding name="management-https" interface="management" port="${jboss.management.https.port:9443}"/> <socket-binding name="ajp" port="8089"/> <socket-binding name="hotrod" port="11222"/> <socket-binding name="http" port="8080"/> <socket-binding name="https" port="8443"/> <socket-binding name="jgroups-mping" port="0" multicast-address="${jboss.default.multicast.address:234.99.54.14}" multicast-port="45700"/> <socket-binding name="jgroups-tcp" port="7600"/> <socket-binding name="jgroups-tcp-fd" port="57600"/> <socket-binding name="jgroups-udp" port="55200" multicast-address="${jboss.default.multicast.address:234.99.54.14}" multicast-port="45688"/> <socket-binding name="jgroups-udp-fd" port="54200"/> <socket-binding name="memcached" port="11211"/> <socket-binding name="modcluster" port="0" multicast-address="224.0.1.115" multicast-port="23364"/> <socket-binding name="remoting" port="4447"/> <socket-binding name="txn-recovery-environment" port="4712"/> <socket-binding name="txn-status-manager" port="4713"/> <socket-binding name="websocket" port="8181"/> </socket-binding-group> </server> Remote Process: service:jmx:remoting-jmx://10.32.222.111:4447 I added user to both management and application realm admin=2a0923285184943425d1f53ddd58ec7a test=2b1be81e1da41d4ea647bd82fc8c2bc9 But when i try to connect its says's: Connection failed: Retry When i use Remote process as:10.32.222.111:4447 on the sever it prompts a warning : 16:29:48,084 ERROR [org.jboss.remoting.remote.connection] (Remoting "djd7w4r1" read-1) JBREM000200: Remote connection failed: java.io.IOException: Received an invali d message length of -2140864253 Also disabled Remote authentication: -Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.ssl=false -Dcom.sun.management.jmxremote.authenticate=false -Dcom.sun.management.jmxremote.port=12345 Still not able to connect. Any help will be highly appreciated . Thanks

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  • Is there a way to tell Drupal not to cache a specific page?

    - by TechplexEngineer
    I have a custom php page that processes a feed of images and makes albums out of it. However whenever i add pictures to my feed, the Drupal page doesn't change until I clear the caches. Is there a way to tell Drupal not to cache that specific page? Thanks, Blake Edit: Drupal v6.15 Not exactly sure what you mean oswald, team2648.com/media is hte page. I used the php interpreter module. Here is the php code: <?php //////// CODE by Pikori Web Designs - pikori.org /////////// //////// Please do not remove this title, /////////// //////// feel free to modify or copy this software /////////// $feedURL = 'http://picasaweb.google.com/data/feed/base/user/Techplex.Engineer?alt=rss&kind=album&hl=en_US'; $photoNodeNum = 4; $galleryTitle = 'Breakaway Pictures'; $year = '2011'; ?> <?php /////////////// DO NOT EDIT ANYTHING BELOW THIS LINE ////////////////// $album = $_GET['album']; if($album != ""){ //GENERATE PICTURES $feedURL= "http://".$album."&kind=photo&hl=en_US"; $feedURL = str_replace("entry","feed",$feedURL); $sxml = simplexml_load_file($feedURL); $column = 0; $pix_count = count($sxml->channel->item); //print '<h2>'.$sxml->channel->title.'</h2>'; print '<table cellspacing="0" cellpadding="0" style="font-size:10pt" width="100%"><tr>'; for($i = 0; $i < $pix_count; $i++) { print '<td align="center">'; $entry = $sxml->channel->item[$i]; $picture_url = $entry->enclosure['url']; $time = $entry->pubDate; $time_ln = strlen($time)-14; $time = substr($time,0,$time_ln); $description = $entry->description; $tn_beg = strpos($description, "src="); $tn_end = strpos($description, "alt="); $tn_length = $tn_end - $tn_beg; $tn = substr($description, $tn_beg, $tn_length); $tn_small = str_replace("s288","s128",$tn); $picture_url = $tn; $picture_beg = strpos($picture_url,"http:"); $picture_len = strlen($picture_url)-7; $picture_url = substr($tn, $picture_beg, $picture_len); $picture_url = str_replace("s288","s640",$picture_url); print '<a rel="lightbox[group]" href="'.$picture_url.'">'; print '<img '.$tn_small.' style="border:1px solid #02293a"><br>'; print '</a></td> '; if($column == 4){ print '</tr><tr>'; $column = 0;} else $column++; } print '</table>'; print '<br><center><a href="media">Return to album</a></center>'; } else { //GENERATE ALBUMS $sxml = simplexml_load_file($feedURL); $column = 0; $album_count = count($sxml->channel->item); //print '<h2>'.$galleryTitle.'</h2>'; print '<table cellspacing="0" cellpadding="0" style="font-size:10pt" width="100%"><tr>'; for($i = 0; $i < $album_count; $i++) { $entry = $sxml->channel->item[$i]; $time = $entry->pubDate; $time_ln = strlen($time)-14; $time = substr($time,0,$time_ln); $description = $entry->description; $tn_beg = strpos($description, "src="); $tn_end = strpos($description, "alt="); $tn_length = $tn_end - $tn_beg; $tn = substr($description, $tn_beg, $tn_length); $albumrss = $entry->guid; $albumrsscount = strlen($albumrss) - 7; $albumrss = substr($albumrss, 7, $albumrsscount); $search = strstr($time, $year); if($search != FALSE || $year == ''){ print '<td valign="top">'; print '<a href="/node/'.$photoNodeNum.'?album='.$albumrss.'">'; print '<center><img '.$tn.' style="border:3px double #cccccc"><br>'; print $entry->title.'<br>'.$time.'</center>'; print '</a><br></td> '; if($column == 3){ print '</tr><tr>'; $column = 0; } else { $column++; } } } print '</table>'; } ?>

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  • In Java Concurrency In Practice by Brian Goetz, why is the Memoizer class not annotated with @ThreadSafe?

    - by dig_dug
    Java Concurrency In Practice by Brian Goetz provides an example of a efficient scalable cache for concurrent use. The final version of the example showing the implementation for class Memoizer (pg 108) shows such a cache. I am wondering why the class is not annotated with @ThreadSafe? The client, class Factorizer, of the cache is properly annotated with @ThreadSafe. The appendix states that if a class is not annotated with either @ThreadSafe or @Immutable that it should be assumed that it isn't thread safe. Memoizer seems thread-safe though. Here is the code for Memoizer: public class Memoizer<A, V> implements Computable<A, V> { private final ConcurrentMap<A, Future<V>> cache = new ConcurrentHashMap<A, Future<V>>(); private final Computable<A, V> c; public Memoizer(Computable<A, V> c) { this.c = c; } public V compute(final A arg) throws InterruptedException { while (true) { Future<V> f = cache.get(arg); if (f == null) { Callable<V> eval = new Callable<V>() { public V call() throws InterruptedException { return c.compute(arg); } }; FutureTask<V> ft = new FutureTask<V>(eval); f = cache.putIfAbsent(arg, ft); if (f == null) { f = ft; ft.run(); } } try { return f.get(); } catch (CancellationException e) { cache.remove(arg, f); } catch (ExecutionException e) { throw launderThrowable(e.getCause()); } } } }

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  • Disable caching in JPA (eclipselink)

    - by James
    Hi, I want to use JPA (eclipselink) to get data from my database. The database is changed by a number of other sources and I therefore want to go back to the database for every find I execute. I have read a number of posts on disabling the cache but this does not seem to be working. Any ideas? I am trying to execute the following code: EntityManagerFactory entityManagerFactory = Persistence.createEntityManagerFactory("default"); EntityManager em = entityManagerFactory.createEntityManager(); MyLocation one = em.createNamedQuery("MyLocation.findMyLoc").getResultList().get(0); MyLocation two = em.createNamedQuery("MyLocation.findMyLoc").getResultList().get(0); System.out.println(one==two); one==two is true while I want it to be false. I have tried adding each/all the following to my persistence.xml <property name="eclipselink.cache.shared.default" value="false"/> <property name="eclipselink.cache.size.default" value="0"/> <property name="eclipselink.cache.type.default" value="None"/> I have also tried adding the @Cache annotation to the Entity itself: @Cache( type=CacheType.NONE, // Cache nothing expiry=0, alwaysRefresh=true ) Am I misunderstanding something? Thank you, James

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  • Disable chaching in JPA (eclipselink)

    - by James
    Hi, I want to use JPA (eclipselink) to get data from my database. The database is changed by a number of other sources and I therefore want to go back to the database for every find I execute. I have read a number of posts on disabling the cache but this does not seem to be working. Any ideas? I am trying to execute the following code: EntityManagerFactory entityManagerFactory = Persistence.createEntityManagerFactory("default"); EntityManager em = entityManagerFactory.createEntityManager(); MyLocation one = em.createNamedQuery("MyLocation.findMyLoc").getResultList().get(0); MyLocation two = em.createNamedQuery("MyLocation.findMyLoc").getResultList().get(0); System.out.println(one==two); one==two is true while I want it to be false. I have tried adding each/all the following to my persistence.xml <property name="eclipselink.cache.shared.default" value="false"/> <property name="eclipselink.cache.size.default" value="0"/> <property name="eclipselink.cache.type.default" value="None"/> I have also tried adding the @Cache annotation to the Entity itself: @Cache( type=CacheType.NONE, // Cache nothing expiry=0, alwaysRefresh=true ) Am I misunderstanding something? Thank you, James

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  • using the ASP.NET Caching API via method annotations in C#

    - by craigmoliver
    In C#, is it possible to decorate a method with an annotation to populate the cache object with the return value of the method? Currently I'm using the following class to cache data objects: public class SiteCache { // 7 days + 6 hours (offset to avoid repeats peak time) private const int KeepForHours = 174; public static void Set(string cacheKey, Object o) { if (o != null) HttpContext.Current.Cache.Insert(cacheKey, o, null, DateTime.Now.AddHours(KeepForHours), TimeSpan.Zero); } public static object Get(string cacheKey) { return HttpContext.Current.Cache[cacheKey]; } public static void Clear(string sKey) { HttpContext.Current.Cache.Remove(sKey); } public static void Clear() { foreach (DictionaryEntry item in HttpContext.Current.Cache) { Clear(item.Key.ToString()); } } } In methods I want to cache I do this: [DataObjectMethod(DataObjectMethodType.Select)] public static SiteSettingsInfo SiteSettings_SelectOne_Name(string Name) { var ck = string.Format("SiteSettings_SelectOne_Name-Name_{0}-", Name.ToLower()); var dt = (DataTable)SiteCache.Get(ck); if (dt == null) { dt = new DataTable(); dt.Load(ModelProvider.SiteSettings_SelectOne_Name(Name)); SiteCache.Set(ck, dt); } var info = new SiteSettingsInfo(); foreach (DataRowView dr in dt.DefaultView) info = SiteSettingsInfo_Load(dr); return info; } Is it possible to separate those concerns like so: (notice the new annotation) [CacheReturnValue] [DataObjectMethod(DataObjectMethodType.Select)] public static SiteSettingsInfo SiteSettings_SelectOne_Name(string Name) { var dt = new DataTable(); dt.Load(ModelProvider.SiteSettings_SelectOne_Name(Name)); var info = new SiteSettingsInfo(); foreach (DataRowView dr in dt.DefaultView) info = SiteSettingsInfo_Load(dr); return info; }

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  • Caching page by parts; how to pass variables calculated in cached parts into never-cached parts?

    - by Kirzilla
    Hello, Let's imagine that I have a code like this... if (!$data = $cache->load("part1_cache_id")) { $item_id = $model->getItemId(); ob_start(); echo 'Here is the cached item id: '.$item_id; $data = ob_get_contents(); ob_end_clean(); $cache->save($data, "part1_cache_id"); } echo $data; echo never_cache_function($item_id); if (!$data_2 = $cache->load("part2_cache_id")) { ob_start(); echo 'Here is the another cached part of the page...'; $data_2 = ob_get_contents(); ob_end_clean(); $cache->save("part2_cache_id"); } echo $data_2; As far as you can see I need to pass $item_id variable into never_cache_function, but if fist part is cached (part1_cache_id) then I have no way to get $item_id value. I see the only solution - serialize all data from fist part (including $item_id value); then cache serialized string and unserialize it everytime when script is executed... Something like this... if (!$data = $cache->load("part1_cache_id")) { $item_id = $model->getItemId(); $data['item_id'] = $item_id; ob_start(); echo 'Here is the cached item id: '.$item_id; $data['html'] = ob_get_contents(); ob_end_clean(); $cache->save( serialize($data), "part1_cache_id" ); } $data = unserialize($data); echo $data['html'] echo never_cache_function($data['item_id']); Is there any other ways for doing such trick? I'm looking for the most high performance solution. Thank you UPDATED And another question is - how to implement such caching into controller without separating page into two templates? Is it possible? PS: Please, do not suggest Smarty, I'm really interested in implementing custom caching.

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  • How to get the actual address of a pointer in C?

    - by Airjoe
    BACKGROUND: I'm writing a single level cache simulator in C for a homework assignment, and I've been given code that I must work from. In our discussions of the cache, we were told that the way a small cache can hold large addresses is by splitting the large address into the position in the cache and an identifying tag. That is, if you had an 8 slot cache but wanted to store something with address larger than 8, you take the 3 (because 2^3=8) rightmost bits and put the data in that position; so if you had address 22 for example, binary 10110, you would take those 3 rightmost bits 110, which is decimal 5, and put it in slot 5 of the cache. You would also store in this position the tag, which is the remaining bits 10. One function, cache_load, takes a single argument, and integer pointer. So effectively, I'm being given this int* addr which is an actual address and points to some value. In order to store this value in the cache, I need to split the addr. However, the compiler doesn't like when I try to work with the pointer directly. So, for example, I try to get the position by doing: npos=addr%num_slots The compiler gets angry and gives me errors. I tried casting to an int, but this actually got me the value that the pointer was pointing to, not the numerical address itself. Any help is appreciated, thanks!

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  • Rackspace Cloud rewrite jpg causes Session reset

    - by willoller
    This may be the .Net version of this question. I have an image script with the following: ... Response.WriteFile(filename); Response.End(); I am rewriting .jpg files using the following rewrite rule in web.config: <rule name="Image Redirect" stopProcessing="true"> <match url="^product-images/(.*).jpg" /> <conditions> <add input="{REQUEST_URI}" pattern="\.(jp?g|JP?G)$" /> </conditions> <action type="Redirect" redirectType="SeeOther" url="/product-images/ProductImage.aspx?path=product-images/{tolower:{R:1}}.jpg" /> </rule> It basically just rewrites the image path into a query parameter. The problem is that (intermittently of course) Mosso returns a new Asp Session cookie which breaks the whole world. Directly accessing a static .jpg file does not cause this problem. Directly accessing the image script does not cause it either. Only rewriting a .jpg file to the .aspx script causes the Session loss. Things I have tried (From the Rackspace doc How can I bypass the cache?) I added Private cacheability to the image script itself: Response.Cache.SetCacheability(HttpCacheability.Private); I tried adding these cache-disabling nodes to web.config: <staticContent> <clientCache cacheControlMode="DisableCache" /> </staticContent> and <httpProtocol> <customHeaders> <add name="Cache-Control private" value="Cache-Control private" </customHeaders> </httpProtocol> The Solution I need The browser cache cannot be disabled. This means potential solutions involving Cache.SetNoStore() or HttpCacheability.NoCache will not work.

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  • using xpath get the correct value in selectName

    - by Sangeeta
    Below I have written the code. I need help to get the right value in selectName. I am new to XPath. Basically with this code I am trying to achieve if employeeName = Chris I need to return 23549 to the calling function. Please help. Part of the code: public static string getEmployeeeID(string employeeName) { Cache cache = HttpContext.Current.Cache; string cacheNameEmployee = employeeName + "Tech"; if (cache[cacheNameEpm] == null) { XPathDocument doc = new XPathDocument(HttpContext.Current.Request.MapPath("inc/xml/" + SiteManager.Site.ToString() + "TechToolTip.xml")); XPathNavigator navigator = doc.CreateNavigator(); string selectName = "/Technologies/Technology[FieldName='" + fieldName + "']/EpmId"; XPathNodeIterator nodes = navigator.Select(selectName); if (nodes.Count > 0) { if (nodes.Current.Name.Equals("FieldName")) //nodes.Current.MoveToParent(); //nodes.Current.MoveToParent(); //nodes.Current.MoveToChild("//EpmId"); cache.Add(cacheNameEpm, nodes.Current.Value, null, DateTime.Now + new TimeSpan(4, 0, 0), System.Web.Caching.Cache.NoSlidingExpiration, CacheItemPriority.Default, null); } } return cache[cacheNameEpm] as string; } XML file <?xml version="1.0" encoding="utf-8" ?> <Employees> <Employee> <EName>Chris</EName> <ID>23556</ID> </Employee> <Employee> <EName>CBailey</EName> <ID>22222</ID> </Employee> <Employee> <EName>Meghan</EName> <ID>12345</ID> </Employee> </Employees> PLEASE NOTE:This XML file has 100 nodes. I just put 1 to indicate the structure.

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  • A member variable's hashCode() value is different

    - by Jacques René Mesrine
    There's a piece of code that looks like this. The problem is that during bootup, 2 initialization takes place. (1) Some method does a reflection on ForumRepository & performs a newInstance() purely to invoke #setCacheEngine. (2) Another method following that invokes #start(). I am noticing that the hashCode of the #cache member variable is different sometimes in some weird scenarios. Since only 1 piece of code invokes #setCacheEngine, how can the hashCode change during runtime (I am assuming that a different instance will have a different hashCode). Is there a bug here somewhere ? public class ForumRepository implements Cacheable { private static CacheEngine cache; private static ForumRepository instance; public void setCacheEngine(CacheEngine engine) { cache = engine; } public synchronized static void start() { instance = new ForumRepository(); } public synchronized static void addForum( ... ) { cache.add( .. ); System.out.println( cache.hashCode() ); // snipped } public synchronized static void getForum( ... ) { ... cache.get( .. ); System.out.println( cache.hashCode() ); // snipped } }

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  • VirtualHost and 403 Forbidden problem with Apache

    - by Joaquín L. Robles
    Hi people, I have the exactly same problem as in 403 Forbidden Error when accessing enabled virtual host, but I tried the provided solution and still receiving 403 Forbidden, my site is called project, and it's cofiguration file in /etc/apache2/sites-available is the following: <VirtualHost *:80> ServerAdmin webmaster@reweb ServerName www.online.project.com ErrorLog /logs/project-errors.log DocumentRoot /home/joarobles/Zend/workspaces/DefaultWorkspace7/online.project.com.ar/public <Directory /home/joarobles/Zend/workspaces/DefaultWorkspace7/online.project.com.ar> Order Deny,Allow Allow from all Options Indexes </Directory> Tried to change the owner of /home/joarobles/Zend/workspaces/DefaultWorkspace7/online.cobico.com.ar to www:data:www-data with recursion, but still getting this error in project-errors.log: [Mon Jan 31 01:26:01 2011] [crit] [client 127.0.0.1] (13)Permission denied: /home/joarobles/.htaccess pcfg_openfile: unable to check htaccess file, ensure it is readable Any idea? Thanks!

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  • PHP-FPM and APC for shared hosting?

    - by Tiffany Walker
    We are looking into finding a way to get APC to only create one cache per account / site. This can be done with Fastcgi (last update 2006…) but with Fastcgid APC will have to create multiple caches for multiple processes run by the same account. To get around this problem, we have been looking into PHP-FPM PHP process manager allows multiple PHP processes to share a single APC cache. But from what I have read (I hope I'm wrong) , even if you create a pool per process, all sites accross all pools will share the same APC cache. This brings us back to the same problem as with shared Memcached: it's not secure ! On php-fpm's site I read that you can chroot php-fpm pools and define a specific UID and GID per pool… if this is the case then shouldn't APC have to use this user and not have access to other pools cache ? An article here (in 2011) suggests that you would need to run one process per pool creating multiple launchers on different ports and different config files with one pool per config file : http://groups.drupal.org/node/198168 Is this still neceessary ? If so what would be the impact of running say 800 processes of php-fpm ? Would it be mainly memory ? If so how can I work out what the memory impact would be ? I guess that it would be better to run 800 times php-fpm then to have accounts creating multiple APC caches for a single site ? If on average an account creates a 50MB cache and creates 3 caches per account that makes 150Mb per account which makes 120GB… However if each account uses on average only 50Mb that would make 40GB We will have at least 128GB of ram on our next server so 40GB is acceptable if running 800 x PHP-FPM does not create an overhead of more than 20GB ! What do you think is PHP-FPM the best way to go to provide secure APC cache on shared hosting with a server that has a decent amount of memory ? Or should I be looking at another system ? Thanks !

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