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https://issues.apache.org/jira/browse/OAK-6500?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16104499#comment-16104499
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Chetan Mehrotra commented on OAK-6500:
--------------------------------------
Added ignored test with 1803248.
The test uses
[UnixOperatingSystemMXBean#maxFileDescriptorCount|https://docs.oracle.com/javase/7/docs/jre/api/management/extension/com/sun/management/UnixOperatingSystemMXBean.html#getMaxFileDescriptorCount()]
to check how many file handles are open. Hence would only work on unix setups.
The test configures nrt logic to use SimpleFSDirectory which avoids memory
mapped file access and hence any open file gets reflected in file descriptor
count
> NRTIndex leaks file handles due to unclosed IndexReader
> -------------------------------------------------------
>
> Key: OAK-6500
> URL: https://issues.apache.org/jira/browse/OAK-6500
> Project: Jackrabbit Oak
> Issue Type: Bug
> Components: lucene
> Affects Versions: 1.6.0
> Reporter: Chetan Mehrotra
> Assignee: Chetan Mehrotra
> Priority: Critical
> Fix For: 1.8, 1.7.5, 1.6.4
>
> Attachments: OAK-6500-v1.patch
>
>
> On some setups under stress it has been seen that NRTIndex leaks file handles
> over time.
> Checking with lsof indicates that more than 3 nrt folders per index are being
> used. However per design there can be max 3 and after system is not in use
> max 1 should be present.
> {noformat}
> $ lsof -p 9550 | grep '/nrt' | gawk 'match($0,
> /.*crx-quickstart\/repository\/index\/(.*?)\/\_.*$/, m) { print m[1]; }' |
> sort | uniq
> cqPageLucene-1501065263331/nrt1501065335930
> cqPageLucene-1501065263331/nrt1501065374667
> cqPageLucene-1501065263331/nrt1501065392492
> cqPageLucene-1501065263331/nrt1501065440955
> cqPageLucene-1501065263331/nrt1501065473286
> cqPageLucene-1501065263331/nrt1501065507345
> slingeventJob-1501065263330/nrt1501065356975
> slingeventJob-1501065263330/nrt1501065373229
> slingeventJob-1501065263330/nrt1501065394142
> slingeventJob-1501065263330/nrt1501065440953
> slingeventJob-1501065263330/nrt1501065473282
> slingeventJob-1501065263330/nrt1501065507342
> versionStoreIndex-1501065263332/nrt1501065335925
> versionStoreIndex-1501065263332/nrt1501065366781
> versionStoreIndex-1501065263332/nrt1501065392490
> versionStoreIndex-1501065263332/nrt1501065441232
> versionStoreIndex-1501065263332/nrt1501065473285
> {noformat}
> Further actually checking index folder indicates that those folder are
> actually deleted. So some where the file handle is still referring them.
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