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https://issues.apache.org/jira/browse/HBASE-5088?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13181156#comment-13181156
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Jieshan Bean commented on HBASE-5088:
-------------------------------------
Either the patch of replace TreeMap with ConcurrentSkipListMap, or the patch of
replace SoftValueSortedMap with ConcurrentSkipListMap, the performance slightly
degraded. The latter one seems better. Please find the test results from the
attachment "PerformanceTestResults.png".
> 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
>
> Attachments: 5088-useMapInterfaces.txt, 5088.generics.txt,
> HBase-5088-90.patch, HBase-5088-trunk.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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