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https://issues.apache.org/jira/browse/CASSANDRA-18905?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17771819#comment-17771819
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Mike Adamson commented on CASSANDRA-18905:
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|[5.0|https://github.com/apache/cassandra/pull/2769]|[CircleCI|https://app.circleci.com/pipelines/github/mike-tr-adamson/cassandra/311/workflows/3fb0868b-a638-4582-9756-b799d4826b4d]|
|[trunk|https://github.com/apache/cassandra/pull/2771]|[CircleCI|https://app.circleci.com/pipelines/github/mike-tr-adamson/cassandra/312/workflows/41e07357-e78b-4946-abd7-675033352753]|
> 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
>
>
> 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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