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https://issues.apache.org/jira/browse/HBASE-14279?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14706430#comment-14706430
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Heng Chen commented on HBASE-14279:
-----------------------------------
yeah... maybe we can replace {{ConcurrentMap<K, Set<V>> container;}} with
{{ConcurrentMap<K, Pair<Object, Set<V>>> container;}}
{{Pair.getFirst()}} is Lock for current key. {{Pair.getSecond()}} is real set.
> Race condition in ConcurrentIndex
> ---------------------------------
>
> Key: HBASE-14279
> URL: https://issues.apache.org/jira/browse/HBASE-14279
> Project: HBase
> Issue Type: Bug
> Reporter: Hiroshi Ikeda
> Priority: Minor
>
> {{ConcurrentIndex.put}} and {{remove}} are in race condition. It is possible
> to remove a non-empty set, and to add a value to a removed set. Also
> {{ConcurrentIndex.values}} is vague in sense that the returned set sometimes
> trace the current state and sometimes doesn't.
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