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From "Lars Hofhansl (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-5088) A concurrency issue on SoftValueSortedMap
Date Sun, 08 Jan 2012 01:15:40 GMT

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

Lars Hofhansl updated HBASE-5088:
---------------------------------

    Attachment: 5088-0.90.txt

This is what I committed to 0.90.

While I worked on that I noticed that I can get rid more concrete uses of SoftvalueSortedMap
in HConnectionManager (in fact all uses except creation, which is nice). I'll do an addendum
for this in 0.92 and trunk.
                
> 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: 5088-0.90.txt, 5088-final3.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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