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https://issues.apache.org/jira/browse/HBASE-5088?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13175142#comment-13175142
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Lars Hofhansl commented on HBASE-5088:
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If the observed behavior is for the calling thread to enter an infinite loop
(as Jieshan seems to suggest) I'd say this is a critical issue. (imagine this
happening in a long lived application server)
Jieshan, can confirm that what you saw was a thread entering looping
indefinitely?
As I said above, I think using SoftReferences for caching is generally
misguided.
As far as I am concerned we can just replace SoftValueSortedMap with
ConcurrentSkipListMap.
> 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 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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