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https://issues.apache.org/jira/browse/OAK-4263?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15281323#comment-15281323
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Thomas Mueller commented on OAK-4263:
-------------------------------------
http://svn.apache.org/r1743481 (trunk)
In a microbenchmark, I didn't see much performance improvement (41 millions
operations/second vs. 40 million ops/sec before). I also didn't see notifyAll()
to be a problem even without the fix. Maybe this is also related to the JVM and
other factors. But I have seen notifyAll to be a bottleneck in a few full
thread dumps before, so I guess the patch is fine.
> LIRS cache: excessive use of notifyAll
> --------------------------------------
>
> Key: OAK-4263
> URL: https://issues.apache.org/jira/browse/OAK-4263
> Project: Jackrabbit Oak
> Issue Type: Bug
> Reporter: Thomas Mueller
> Assignee: Thomas Mueller
> Fix For: 1.6
>
>
> The LIRS cache tries to avoid loading the same cache entry concurrently. To
> notify a possible waiting thread, it uses notifyAll. This is a relatively
> expensive operation, and should be avoided if possible.
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