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https://issues.apache.org/jira/browse/OAK-2125?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14145964#comment-14145964
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Chetan Mehrotra commented on OAK-2125:
--------------------------------------

Added support in http://svn.apache.org/r1627228

By default logging integration is not enabled and Lucene continues to use the 
{{InfoStream.NO_OUTPUT}} so performance impact. To enable it one must set the 
'debug' flag to true for 
{{org.apache.jackrabbit.oak.plugins.index.lucene.LuceneIndexProviderService}} 
OSGi config. Once enabled actual logging can be configured via category 
{{oak.lucene}}. 

Sample output

{noformat}
24.09.2014 11:13:16.750 *DEBUG* [pool-12-thread-4] oak.lucene.TP [TP] 
startStartCommit
24.09.2014 11:13:16.750 *DEBUG* [pool-12-thread-4] oak.lucene.IW [IW] 
startCommit(): start
24.09.2014 11:13:16.750 *DEBUG* [pool-12-thread-4] oak.lucene.IW [IW] 
startCommit index=_a(4.7):C19809 changeCount=4
24.09.2014 11:13:16.750 *DEBUG* [pool-12-thread-4] oak.lucene.TP [TP] 
midStartCommit
24.09.2014 11:13:16.750 *DEBUG* [pool-12-thread-4] oak.lucene.TP [TP] 
midStartCommit2
24.09.2014 11:13:16.750 *DEBUG* [pool-12-thread-4] oak.lucene.IW [IW] done all 
syncs: [_a.tim, _a.nvm, _a.tip, _a.doc, _a.nvd, _a.fdt, _a.si, _a.pos, _a.fdx, 
_a.fnm]
24.09.2014 11:13:16.750 *DEBUG* [pool-12-thread-4] oak.lucene.TP [TP] 
midStartCommitSuccess
24.09.2014 11:13:16.750 *DEBUG* [pool-12-thread-4] oak.lucene.TP [TP] 
finishStartCommit
24.09.2014 11:13:16.750 *DEBUG* [pool-12-thread-4] oak.lucene.IW [IW] commit: 
pendingCommit != null
24.09.2014 11:13:16.751 *DEBUG* [pool-12-thread-4] oak.lucene.IW [IW] commit: 
wrote segments file "segments_9"
24.09.2014 11:13:16.751 *DEBUG* [pool-12-thread-4] oak.lucene.IFD [IFD] now 
checkpoint "_a(4.7):C19809" [1 segments ; isCommit = true]
24.09.2014 11:13:16.751 *DEBUG* [pool-12-thread-4] oak.lucene.IFD [IFD] 
deleteCommits: now decRef commit "segments_8"
{noformat}

> Integrate Lucene logging with Slf4j
> -----------------------------------
>
>                 Key: OAK-2125
>                 URL: https://issues.apache.org/jira/browse/OAK-2125
>             Project: Jackrabbit Oak
>          Issue Type: Improvement
>          Components: oak-lucene
>            Reporter: Chetan Mehrotra
>            Assignee: Chetan Mehrotra
>            Priority: Minor
>             Fix For: 1.1, 1.0.7
>
>
> Lucene creates debug logging which are routed via 
> [InfoStream|http://lucene.apache.org/core/4_0_0/core/org/apache/lucene/util/InfoStream.html].
>  Currently there is no way to enable that in Oak. We should provide a way to 
> route the logs via slf4j



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