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https://issues.apache.org/jira/browse/CASSANDRA-18905?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17776824#comment-17776824
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Caleb Rackliffe commented on CASSANDRA-18905:
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Thanks [~adelapena]. I'm going to go ahead and commit this...
> Index.Group is incorrectly unregistered from the SecondaryIndexManager
> ----------------------------------------------------------------------
>
> Key: CASSANDRA-18905
> URL: https://issues.apache.org/jira/browse/CASSANDRA-18905
> Project: Cassandra
> Issue Type: Bug
> Components: Feature/2i Index
> Reporter: Mike Adamson
> Assignee: Mike Adamson
> Priority: Urgent
> Fix For: 5.0, 5.1
>
>
> An Index.Group is removed from the SecondaryIndexManager during
> unregisterIndex if it contains no indexes after the index is unregistered.
> The code for removing the group uses the wrong key to remove the group from
> the indexGroups map. It is using the group object rather than the group name
> that is used as the key in the map.
> This means that the group is not added again if a new index is registered
> using that group. The knock on from this is that the
> StorageAttachedIndexGroup unregisters itself from the Tracker when it has no
> indexes after an index is removed. The same group with no tracker is then
> used for new indexes. This group then receives no notifications about sstable
> or memtable updates. The ultimate side effect of this is that, memtables are
> not released, resulting in memory leaks and indexes are not updated with new
> sstables and their associated index files.
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