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https://issues.apache.org/jira/browse/HBASE-5088?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jieshan Bean updated HBASE-5088:
--------------------------------
Attachment: HBase5088Reproduce.java
HBase-5088-trunk.patch
HBase-5088-90.patch
This problem can't be easily reproduced in the cluster. So I just mocked it by
write some test code to reproduce this same concurrency issue. See
HBase5088Reproduce.java, it can be reproduced with a high probability. Change
the TreeMap to ConcurrentSkipListMap can solve the problem.
The patches, I have tested them. All the unit tests passed. In cluster, the
performance seems a slighly coming down:
38764-without patch and 37080-with patch
> 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
> Attachments: 5088-useMapInterfaces.txt, HBase-5088-90.patch,
> HBase-5088-trunk.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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