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https://issues.apache.org/jira/browse/LUCENE-7527?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15630268#comment-15630268
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Jagmohan Singh commented on LUCENE-7527:
----------------------------------------
Michael thanks for replying. We have mounts in different location and NIOFS
will surely degrade more. The exception is coming while i am trying to call
maybeReopen() method explicitly under SearcherManager as i want to get the
latest data before i could do any search. After calling maybeReopen() we do
call acquire() and then search and then release at the end of search call.
> 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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