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https://issues.apache.org/jira/browse/USERGRID-405?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14378765#comment-14378765
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ASF GitHub Bot commented on USERGRID-405:
-----------------------------------------
Github user asfgit closed the pull request at:
https://github.com/apache/incubator-usergrid/pull/175
> Fix hotspot from continuous writes of entities (Shawn)
> ------------------------------------------------------
>
> Key: USERGRID-405
> URL: https://issues.apache.org/jira/browse/USERGRID-405
> Project: Usergrid
> Issue Type: Story
> Reporter: Todd Nine
> Assignee: Todd Nine
> Fix For: Release old
>
>
> Currently, performing a continuous PUT in 2.0 under heavy load causes a
> hotspot in our cassandra data.
> Cause:
> # Under load, entities can be PUT continuously
> # Asynchronous cleanups run and delete previous versions
> # These versions are retained in cassandra for long periods of time. This
> causes severe row bloating before compaction occurs.
> Solution:
> For entity data, we only care about the current max version. We should
> change this column family to store only the maximum data format. We will
> need to keep the log of previous versions, so that we can bring ES into a
> consistent state
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