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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CXF-6825) Performance bottle neck due to synchronize block on each read
Date Wed, 09 Mar 2016 12:45:40 GMT

    [ https://issues.apache.org/jira/browse/CXF-6825?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15187040#comment-15187040
] 

ASF GitHub Bot commented on CXF-6825:
-------------------------------------

Github user dkulp commented on the pull request:

    https://github.com/apache/cxf/pull/119#issuecomment-194280245
  
    You HAVE to have the lock on the get as well as the put.   During the put, the entire
map is allowed to be restructured internally (buckets recalculated, etc... if the map grows)
which would make anything going on in the get invalid. 


> Performance bottle neck due to synchronize block on each read
> -------------------------------------------------------------
>
>                 Key: CXF-6825
>                 URL: https://issues.apache.org/jira/browse/CXF-6825
>             Project: CXF
>          Issue Type: Bug
>          Components: Bus, JAX-RS
>    Affects Versions: 3.1.0, 3.1.1, 3.1.2, 3.1.3, 3.1.4, 3.1.5, 3.2.0, 3.1.6
>         Environment: All environments
>            Reporter: Yotam Madem
>             Fix For: 3.2.0, 3.1.6
>
>   Original Estimate: 24h
>  Remaining Estimate: 24h
>
> In our (IBM MobileFirst foundation) performance tests it is possible to see that many
threads are stuck at:
> "LargeThreadPool-thread-1505" daemon prio=10 tid=0x00007f10f020b800 nid=0x31fc waiting
for monitor entry [0x00007f12bfffd000]
>    java.lang.Thread.State: BLOCKED (on object monitor)
> 	at org.apache.cxf.BusFactory.getThreadBusHolder(BusFactory.java:120)
> 	- waiting to lock <0x00000000c6b99020> (a java.util.WeakHashMap)
> 	at org.apache.cxf.BusFactory.getAndSetThreadDefaultBus(BusFactory.java:202)
>  
> (We use version 3.1.0)
> I did a test fix locally and it seems to resolve our problem so I submitted 2 pull requests:
> for 3.1.6: https://github.com/apache/cxf/pull/119
> for 3.2.0: https://github.com/apache/cxf/pull/120



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