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From Bernd Fehling <bernd.fehl...@uni-bielefeld.de>
Subject no concurrent merging?
Date Thu, 04 Aug 2016 11:03:30 GMT
While increasing the indexing load of version 5.5.3 I see
threads where one merging thread is blocking other merging threads.
But is this concurrent merging?

Bernd

"Lucene Merge Thread #6" - Thread t@40280    java.lang.Thread.State: BLOCKED 	
at org.apache.lucene.index.IndexWriter.mergeMiddle(IndexWriter.java:4008)
 - waiting to lock <6d75db> (a org.apache.solr.update.SolrIndexWriter) owned by "Lucene
Merge Thread #8" t@53896
 at org.apache.lucene.index.IndexWriter.merge(IndexWriter.java:3655)
 at org.apache.lucene.index.ConcurrentMergeScheduler.doMerge(ConcurrentMergeScheduler.java:588)
 at org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:626)
 Locked ownable synchronizers: 	- None

"Lucene Merge Thread #7" - Thread t@40281    java.lang.Thread.State: BLOCKED
 at org.apache.lucene.index.IndexWriter.mergeMiddle(IndexWriter.java:4166)
 - waiting to lock <6d75db> (a org.apache.solr.update.SolrIndexWriter) owned by "Lucene
Merge Thread #8" t@53896
 at org.apache.lucene.index.IndexWriter.merge(IndexWriter.java:3655)
 at org.apache.lucene.index.ConcurrentMergeScheduler.doMerge(ConcurrentMergeScheduler.java:588)
 at org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:626)
 Locked ownable synchronizers: 	- None

"Lucene Merge Thread #8" - Thread t@53896    java.lang.Thread.State: RUNNABLE
 at java.lang.System.identityHashCode(Native Method)
 at org.apache.lucene.index.IndexReader.hashCode(IndexReader.java:302)
 at java.util.WeakHashMap.hash(WeakHashMap.java:298)
 at java.util.WeakHashMap.put(WeakHashMap.java:449)
 at java.util.Collections$SetFromMap.add(Collections.java:5461)
 at java.util.Collections$SynchronizedCollection.add(Collections.java:2035)
 - locked <4c8b5399> (a java.util.Collections$SynchronizedSet)
 at org.apache.lucene.index.IndexReader.registerParentReader(IndexReader.java:138)
 at org.apache.lucene.index.FilterLeafReader.<init>(FilterLeafReader.java:306)
 at org.apache.lucene.uninverting.UninvertingReader.<init>(UninvertingReader.java:184)
 at org.apache.solr.update.DeleteByQueryWrapper.wrap(DeleteByQueryWrapper.java:52)
 at org.apache.solr.update.DeleteByQueryWrapper.createWeight(DeleteByQueryWrapper.java:72)
 at org.apache.lucene.search.IndexSearcher.createWeight(IndexSearcher.java:904)
 at org.apache.lucene.search.IndexSearcher.createNormalizedWeight(IndexSearcher.java:887)
 at org.apache.lucene.index.BufferedUpdatesStream.applyQueryDeletes(BufferedUpdatesStream.java:713)
 at org.apache.lucene.index.BufferedUpdatesStream.applyDeletesAndUpdates(BufferedUpdatesStream.java:246)
 - locked <9f8d81c> (a org.apache.lucene.index.BufferedUpdatesStream)
 at org.apache.lucene.index.IndexWriter._mergeInit(IndexWriter.java:3834)
 - locked <6d75db> (a org.apache.solr.update.SolrIndexWriter)
 at org.apache.lucene.index.IndexWriter.mergeInit(IndexWriter.java:3792)
 - locked <6d75db> (a org.apache.solr.update.SolrIndexWriter)
 at org.apache.lucene.index.IndexWriter.merge(IndexWriter.java:3646)
 at org.apache.lucene.index.ConcurrentMergeScheduler.doMerge(ConcurrentMergeScheduler.java:588)
 at org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:626)


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