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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 18:57:39 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5088?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13181515#comment-13181515

Lars Hofhansl commented on HBASE-5088:

I think we should check in the latest change. Since we cannot reliably reproduce the issue,
we have verify by inspection. The latest change (5088-syncObject.txt) will be least amount
of change from the original code and adds the lowest least extra synchronization needed.

I'll fix up the patch slightly (pull in the interface cleanups from my other patch).

Ted, Stack, etc, please weigh in.

> 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-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,
> 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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