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To: solr-user@lucene.apache.org
From: Rallavagu <rallavagu@gmail.com>
Subject: Commit Error
Message-ID: <56312AD8.7040304@gmail.com>
Date: Wed, 28 Oct 2015 13:06:48 -0700
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Solr 4.6.1, cloud

Seeing following commit errors.

[commitScheduler-19-thread-1] ERROR org.apache.solr.update.CommitTracker 
– auto commit error...:java.lang.IllegalStateException: this writer hit 
an OutOfMemoryError; cannot commit at 
org.apache.lucene.index.IndexWriter.prepareCommitInternal(IndexWriter.java:2807) 
at 
org.apache.lucene.index.IndexWriter.commitInternal(IndexWriter.java:2984) at 
org.apache.solr.update.DirectUpdateHandler2.commit(DirectUpdateHandler2.java:559) 
at org.apache.solr.update.CommitTracker.run(CommitTracker.java:216) at 
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:440) 
at java.util.concurrent.FutureTask.run(FutureTask.java:138) at 
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:98) 
at 
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:206) 
at 
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:896) 
at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:919) 
at java.lang.Thread.run(Thread.java:682)

Looking at the code,

public final void prepareCommit() throws IOException {
     ensureOpen();
     prepareCommitInternal();
   }

   private void prepareCommitInternal() throws IOException {
     synchronized(commitLock) {
       ensureOpen(false);
       if (infoStream.isEnabled("IW")) {
         infoStream.message("IW", "prepareCommit: flush");
         infoStream.message("IW", "  index before flush " + segString());
       }

       if (hitOOM) {
         throw new IllegalStateException("this writer hit an 
OutOfMemoryError; cannot commit");
       }

It simply checking a flag if it hit OOM? What is making to check and set 
the flag? What could be the conditions? Thanks.