Viral Gandhi created LUCENE-9422:
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Summary: Detailed logging for MergePolicy$MergeException stack
trace
Key: LUCENE-9422
URL: https://issues.apache.org/jira/browse/LUCENE-9422
Project: Lucene - Core
Issue Type: Improvement
Reporter: Viral Gandhi
We hit the following exception:
{code:java}
Uncaught exception: org.apache.lucene.index.MergePolicy$MergeException:
java.lang.IllegalStateException: files were not computed yet; segment=_3g5
maxDoc=3095 in thread Thread[Lucene Merge Thread #456,5,main]
org.apache.lucene.index.MergePolicy$MergeException:
java.lang.IllegalStateException: files were not computed yet; segment=_3g5
maxDoc=3095
at
org.apache.lucene.index.ConcurrentMergeScheduler.handleMergeException(ConcurrentMergeScheduler.java:704)
at
org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:684)
Caused by: java.lang.IllegalStateException: files were not computed yet;
segment=_3g5 maxDoc=3095
at org.apache.lucene.index.SegmentInfo.files(SegmentInfo.java:176)
at org.apache.lucene.index.SegmentCommitInfo.files(SegmentCommitInfo.java:228)
at org.apache.lucene.index.IndexWriter$2.mergeFinished(IndexWriter.java:3181)
at org.apache.lucene.index.IndexWriter.closeMergeReaders(IndexWriter.java:4444)
at org.apache.lucene.index.IndexWriter.mergeMiddle(IndexWriter.java:4744)
at org.apache.lucene.index.IndexWriter.merge(IndexWriter.java:4170)
at
org.apache.lucene.index.ConcurrentMergeScheduler.doMerge(ConcurrentMergeScheduler.java:625)
at
com.amazon.lucene.index.ConcurrentMergeSchedulerWrapper.doMerge(ConcurrentMergeSchedulerWrapper.java:64)
at
org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:662)
{code}
After a merge thread hit an exception, and in trying to throw the exception,
Lucene called _SegmentInfo.files()_ which then threw another exception. Maybe
this caused in losing root cause exception? Having more details regarding the
root cause would have been helpful here.
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