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https://issues.apache.org/jira/browse/LUCENE-7527?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15636375#comment-15636375
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Michael McCandless commented on LUCENE-7527:
--------------------------------------------
Please, triple check absolutely all places that close or release a searcher
back to {{SearcherManager}} in your application. If any of those mess up, e.g.
releasing twice, that explains this crash.
Yes, NIOFS will be worse performance than MMapDirectory, but if you temporarily
switch to it, then you should see {{AlreadyClosedException}} instead of JVM
crashes, making it easier to debug where the extra releases are happening.
Once you debug that then you can switch back to MMapDirectory.
> Facing unsafe memory access operation error while calling
> searcherManager.maybeReopen()
> ---------------------------------------------------------------------------------------
>
> Key: LUCENE-7527
> URL: https://issues.apache.org/jira/browse/LUCENE-7527
> Project: Lucene - Core
> Issue Type: Bug
> Components: core/search
> Affects Versions: 3.5
> Reporter: Jagmohan Singh
>
> We are getting below error while calling searcherManager.maybeReopen()
> method. We are using MMAP implementation to read NFS index directory mounted
> against 3 servers. We have a different process to update the indices and 3
> other processes to read from the same index. What we believe is that this
> issue occurs when we call maybeReopen() method during heavy writes to the
> indices and MMap implementation is not able to coop with it..
> Caused by: java.lang.InternalError: a fault occurred in a recent unsafe
> memory access operation in compiled Java code
> at java.security.AccessController.doPrivileged(Native Method)
> at
> org.apache.lucene.store.MMapDirectory.cleanMapping(MMapDirectory.java:158)
> at
> org.apache.lucene.store.MMapDirectory$MMapIndexInput.close(MMapDirectory.java:389)
> at
> org.apache.lucene.index.SegmentInfos$FindSegmentsFile.run(SegmentInfos.java:690)
> at
> org.apache.lucene.index.SegmentInfos$FindSegmentsFile.run(SegmentInfos.java:593)
> at org.apache.lucene.index.SegmentInfos.read(SegmentInfos.java:359)
> at
> org.apache.lucene.index.SegmentInfos.readCurrentVersion(SegmentInfos.java:480)
> at
> org.apache.lucene.index.DirectoryReader.isCurrent(DirectoryReader.java:901)
> at
> org.apache.lucene.index.DirectoryReader.doOpenNoWriter(DirectoryReader.java:471)
> at
> org.apache.lucene.index.DirectoryReader.doOpenIfChanged(DirectoryReader.java:450)
> at
> org.apache.lucene.index.DirectoryReader.doOpenIfChanged(DirectoryReader.java:391)
> at
> org.apache.lucene.index.IndexReader.openIfChanged(IndexReader.java:497)
> at
> org.apache.lucene.search.SearcherManager.maybeReopen(SearcherManager.java:162)
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