Solr master and slave freeze after query
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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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