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https://issues.apache.org/jira/browse/HBASE-5088?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13174612#comment-13174612
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Anoop Sam John commented on HBASE-5088:
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Good catch Jieshan
SoftValueSortedMap.headMap () returns a new Object of SoftValueSortedMap.
This new object's internalMap is a view of the original internalMap which is
refered by the 1st SoftValueSortedMap.. But the view always refer and operates
on the actual TreeMap datastructure which is not Thread safe....
Now 2 threads can operate on the 2 SoftValueSortedMap objects concurrently
which will result in concurrent operation on a single TreeMap object..
> 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
>
> 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 heapMap 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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