[jira] [Resolved] (HBASE-5088) A concurrency issue on SoftValueSortedMap

["Lars Hofhansl (Resolved) (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-5088?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Lars Hofhansl resolved HBASE-5088.
----------------------------------

      Resolution: Fixed
    Hadoop Flags: Reviewed

Committed to 0.92 and trunk.
Not entirely convinced we should make this change in 0.90
                
> 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: Lars Hofhansl
>            Priority: Critical
>             Fix For: 0.92.0, 0.94.0
>
>         Attachments: 5088-final.txt, 5088-final2.txt, 5088-final3.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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