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From "Lars Hofhansl (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5088) A concurrency issue on SoftValueSortedMap
Date Fri, 06 Jan 2012 22:36:39 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5088?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13181656#comment-13181656
] 

Lars Hofhansl commented on HBASE-5088:
--------------------------------------

Look at the {head|tail|sub}Map methods, that's where it gets interesting and is exactly the
reason why there is an extra object to synchronize on.
                
> 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
>            Priority: Critical
>             Fix For: 0.92.0, 0.90.6
>
>         Attachments: 5088-final.txt, 5088-syncObj.txt, 5088-useMapInterfaces.txt, 5088.generics.txt,
HBase-5088-90.patch, HBase-5088-trunk.patch, HBase5088-90-replaceSoftValueSortedMap.patch,
HBase5088-90-replaceTreeMap.patch, HBase5088-trunk-replaceTreeMap.patch, HBase5088Reproduce.java,
PerformanceTestResults.png
>
>
> 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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