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From "Dirk Rudolph (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (OAK-5995) Lucene indexing with copyonread/write holding unexpectedly much files open
Date Wed, 29 Mar 2017 08:32:42 GMT

    [ https://issues.apache.org/jira/browse/OAK-5995?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15946729#comment-15946729
] 

Dirk Rudolph commented on OAK-5995:
-----------------------------------

Thanks Chetan, I will investigate with the Operations team and will let you know. In the meanwhile
I checked the index definitions and there are indeed some which don't have the {{indexPath}}
set. Though those are only small ones compared to others. Does the size matter? If this is
about leaking file handles, what are the circumstances which impact that behaviour? (Index
size, # of queries against the index, # of reads/writes)?

> Lucene indexing with copyonread/write holding unexpectedly much files open
> --------------------------------------------------------------------------
>
>                 Key: OAK-5995
>                 URL: https://issues.apache.org/jira/browse/OAK-5995
>             Project: Jackrabbit Oak
>          Issue Type: Bug
>          Components: lucene
>    Affects Versions: 1.4.1
>            Reporter: Dirk Rudolph
>            Assignee: Chetan Mehrotra
>         Attachments: lsofout2.txt
>
>
> We recently faced the issue that our Oak based enterprise content management system run
into failures due to too much open files. Monitoring the lsof output we found out that most
of the opened files of the process are the files within the configured localIndexDir of the
LuceneIndexProviderService. 
> {code}
> enableCopyOnReadSupport="true"
> localIndexDir="tmp/index"
> enableCopyOnWriteSupport="true"
> {code}
> See attached the lsof output:
> {code}
> ~ wc -l lsofout2.txt
>    20388 lsofout2.txt
> ~ grep "tmp/index" lsofout2.txt | wc -l
>    13499
> {code}
> where more then 60% of open files are "tmp/index" ones as configured as {{localIndexDir}}
shortly after a restart of the process.



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