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https://issues.apache.org/jira/browse/HBASE-1740?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ryan rawson reassigned HBASE-1740:
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Assignee: ryan rawson
> ICV has a subtle race condition only visible under high load
> ------------------------------------------------------------
>
> Key: HBASE-1740
> URL: https://issues.apache.org/jira/browse/HBASE-1740
> Project: Hadoop HBase
> Issue Type: Bug
> Affects Versions: 0.20.0
> Reporter: ryan rawson
> Assignee: ryan rawson
> Fix For: 0.20.1
>
> Attachments: HBASE-1740-test.patch, HBASE-1740.patch, HBASE-icv.patch
>
>
> ICV demonstrates a race condition under high load. The result is a duplicate
> KeyValue with the same timestamp, at first in the memcache, and in hfile,
> then both in hfile. The get/scan code doesnt know which one to read, and
> picks one arbitrarily. One of the keyvalues is correct, one is incorrect.
> What happens at a deeper level:
> - we start an ICV
> - a snapshot happens and moves the memstore to the snapshot
> - the ICV code puts a key-value into memstore that has the same timestamp as
> a keyvalue in the snapshot.
> This is a deep race condition and several attempts to fix it failed in
> production here at SU. This issue is about a more permanent fix.
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