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Date: Fri, 23 Dec 2011 06:23:30 +0000 (UTC)
From: "Jieshan Bean (Commented) (JIRA)" <jira@apache.org>
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Subject: [jira] [Commented] (HBASE-5088) A concurrency issue on
 SoftValueSortedMap
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    [ https://issues.apache.org/jira/browse/HBASE-5088?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13175306#comment-13175306 ] 

Jieshan Bean commented on HBASE-5088:
-------------------------------------

I have made a patch replace the TreeMap with ConcurrentSplitListMap in SoftValueSortedMap, but not replace SoftValueSortedMap. I'm running the test on that patch. once finished, I'll submit the patch.
                
> A concurrency issue on SoftValueSortedMap
> -----------------------------------------
>
>                 Key: HBASE-5088
>                 URL: https://issues.apache.org/jira/browse/HBASE-5088
>             Project: HBase
>          Issue Type: Bug
>          Components: client
>    Affects Versions: 0.90.4, 0.94.0
>            Reporter: Jieshan Bean
>            Assignee: Jieshan Bean
>         Attachments: 5088-useMapInterfaces.txt
>
>
> SoftValueSortedMap is backed by a TreeMap. All the methods in this class are synchronized. If we use this method to add/delete elements, it's ok.
> But in HConnectionManager#getCachedLocation, it use headMap to get a view from SoftValueSortedMap#internalMap. Once we operate 
> on this view map(like add/delete) in other threads, a concurrency issue may occur.

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