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https://issues.apache.org/jira/browse/SOLR-1482?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12761654#action_12761654
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Bill Au commented on SOLR-1482:
-------------------------------
You probably want to take a JVM thread dump (kill -3) while the JVM is hung to
find out what's going on.
Is your webapp app being reloaded? You can check the appserver log file to see
if that's happening. One common way of running out of PermGen space is a
classloader link which occurs when a webapp is reloaded.
> Solr master and slave freeze after query
> ----------------------------------------
>
> Key: SOLR-1482
> URL: https://issues.apache.org/jira/browse/SOLR-1482
> Project: Solr
> Issue Type: Bug
> Affects Versions: 1.4
> Environment: Nightly 9/28/09.
> 14 individual instances per server, using JNDI.
> replicateAfter commit, 5 min interval polling.
> All caches are currently commented out, on both slave and master.
> Lots of ongoing commits - large chunks of data, each accompanied by a commit.
> This is to guarantee that anything we think is now in Solr remains there in
> case the server crashes.
> Reporter: Artem Russakovskii
> Priority: Critical
>
> We're having issues with the deployment of 2 master-slave setups.
> One of the master-slave setups is OK (so far) but on the other both the
> master and the slave keep freezing, but only after I send a query to them.
> And by freezing I mean indefinite hanging, with almost no output to log, no
> errors, nothing. It's as if there's some sort of a deadlock. The hanging
> servers need to be killed with -9, otherwise they keep hanging.
> The query I send queries all instances at the same time using the ?shards=
> syntax.
> On the slave, the logs just stop - nothing shows up anymore after the query
> is issued. On the master, they're a bit more descriptive. This information
> seeps through very-very slowly, as you can see from the timestamps:
> {quote}
> SEVERE: java.lang.OutOfMemoryError: PermGen space
> Oct 1, 2009 2:16:00 PM org.apache.solr.common.SolrException log
> SEVERE: java.lang.OutOfMemoryError: PermGen space
> Oct 1, 2009 2:19:37 PM org.apache.catalina.connector.CoyoteAdapter service
> SEVERE: An exception or error occurred in the container during the request
> processing
> java.lang.OutOfMemoryError: PermGen space
> Oct 1, 2009 2:19:37 PM org.apache.coyote.http11.Http11Processor process
> SEVERE: Error processing request
> java.lang.OutOfMemoryError: PermGen space
> Oct 1, 2009 2:19:39 PM org.apache.catalina.connector.CoyoteAdapter service
> SEVERE: An exception or error occurred in the container during the request
> processing
> java.lang.OutOfMemoryError: PermGen space
> Exception in thread "ContainerBackException in thread "pool-29-threadOct 1,
> 2009 2:21:47 PM org.apache.catalina.connector.CoyoteAdapter service
> SEVERE: An exception or error occurred in the container during the request
> processing
> java.lang.OutOfMemoryError: PermGen space
> Oct 1, 2009 2:21:47 PM
> org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler process
> SEVERE: Error reading request, ignored
> java.lang.OutOfMemoryError: PermGen space
> Oct 1, 2009 2:21:47 PM
> org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler process
> SEVERE: Error reading request, ignored
> java.lang.OutOfMemoryError: PermGen space
> -22" java.lang.OutOfMemoryError: PermGen space
> Oct 1, 2009 2:21:47 PM
> org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler process
> SEVERE: Error reading request, ignored
> java.lang.OutOfMemoryError: PermGen space
> Exception in thread "http-8080-42" Oct 1, 2009 2:21:47 PM
> org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler process
> SEVERE: Error reading request, ignored
> java.lang.OutOfMemoryError: PermGen space
> Oct 1, 2009 2:21:47 PM
> org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler process
> SEVERE: Error reading request, ignored
> java.lang.OutOfMemoryError: PermGen space
> Oct 1, 2009 2:21:47 PM
> org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler process
> SEVERE: Error reading request, ignored
> java.lang.OutOfMemoryError: PermGen space
> Exception in thread "http-8080-26" Exception in thread "http-8080-32"
> Exception in thread "http-8080-25" Exception in thread "http-8080-22"
> Exception in thread "http-8080-15" Exception in thread "http-8080-45"
> Exception in thread "http-8080-13" Exception in thread "http-8080-48"
> Exception in thread "http-8080-7" Exception in thread "http-8080-38"
> Exception in thread "http-8080-39" Exception in thread "http-8080-28"
> Exception in thread "http-8080-1" Exception in thread "http-8080-2" Exception
> in thread "http-8080-12" Exception in thread "http-8080-44" Exception in
> thread "http-8080-47" Exception in thread "http-8080-29" Exception in thread
> "http-8080-33" Exception in thread "http-8080-27" Exception in thread
> "http-8080-36" Exception in thread "http-8080-113" Exception in thread
> "http-8080-112" Exception in thread "http-8080-37" Exception in thread
> "http-8080-18" java.lang.OutOfMemoryError: PermGen space
> java.lang.OutOfMemoryError: PermGen space
> java.lang.OutOfMemoryError: PermGen space
> java.lang.OutOfMemoryError: PermGen space
> java.lang.OutOfMemoryError: PermGen space
> Exception in thread "http-8080-34" java.lang.OutOfMemoryError: PermGen space
> java.lang.OutOfMemoryError: PermGen space
> Exception in thread "http-8080-103"
> {quote}
> So the problem seems to be related to PermGen space. I found
> http://www.nabble.com/Number-of-webapps-td22198080.html and tried
> -XX:MaxPermSize=256m, but it didn't fix the problem. The current
> CATALINA_OPTS looks like this:
> {quote}
> export CATALINA_OPTS="-XX:MaxPermSize=256m -Xmx6500m -XX:+UseConcMarkSweepGC"
> {quote}
> Is the only solution at this point going multicore, as Noble suggested (is
> Noble your first name? I always assumed it was Paul and Noble was part of the
> nickname)? Will multicore get rid of the problem, before we spend time
> looking at it? For multicore, will the existing data dirs be compatible or
> would a complete reindex be needed?
> I'm willing to provide any information to you guys, just not sure what at the
> moment. I'm also open to communicating outside of JIRA, at artem [_aT_] plaxo
> {dot} com.
> Thanks.
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