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Posted to dev@lucene.apache.org by "Kristofer Karlsson (JIRA)" <ji...@apache.org> on 2013/01/31 16:51:12 UTC
[jira] [Created] (LUCENE-4741) Weak references cause extreme GC
churn
Kristofer Karlsson created LUCENE-4741:
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Summary: Weak references cause extreme GC churn
Key: LUCENE-4741
URL: https://issues.apache.org/jira/browse/LUCENE-4741
Project: Lucene - Core
Issue Type: Bug
Components: core/index
Affects Versions: 3.6.1
Environment: Linux debian squeeze 64 bit, Oracle JDK 6, 32 GB RAM, 16 cores
Reporter: Kristofer Karlsson
Priority: Critical
We are running a set of independent search machines, running our custom software using lucene as a search library. We recently upgraded from lucene 3.0.3 to 3.6.1 and noticed a severe degradation of performance.
After doing some heap dump digging, it turns out the process is stalling because it's spending so much time in GC. We noticed about 212 million WeakReference, originating from WeakIdentityMap, originating from MMapIndexInput.
Our problem completely went away after removing the clones weakhashmap from MMapIndexInput, and as a side-effect, disabling support for explictly unmapping the mmapped data.
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