[jira] [Created] (CASSANDRA-13687) Abnormal heap growth and long GC during repair.

["Stanislav Vishnevskiy (JIRA)" <ji...@apache.org>]

Stanislav Vishnevskiy created CASSANDRA-13687:
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             Summary: Abnormal heap growth and long GC during repair.
                 Key: CASSANDRA-13687
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-13687
             Project: Cassandra
          Issue Type: Bug
            Reporter: Stanislav Vishnevskiy
         Attachments: 3.0.14.png, 3.0.9.png

We recently upgraded from 3.0.9 to 3.0.14 to get the fix from CASSANDRA-13004

Sadly 3 out of the last 7 nights we have had to wake up due Cassandra dying on us. We currently don't have any data to help reproduce this, but maybe since there aren't many commits between the 2 version it might be obvious.

Basically we trigger a parallel incremental repair from a single node every night at 1AM. That node will sometimes start allocating a lot and keeping the heap maxed and triggering GC. Some of these GC can last up to 2 minutes. This effectively destroys the whole cluster due to timeouts to this node.

The only solution we currently have is to drain the node and restart the repair, it has worked fine the second time every time.

I attached heap charts from 3.0.9 and 3.0.14.



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