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From "Stefan Podkowinski (JIRA)" <>
Subject [jira] [Commented] (CASSANDRA-13687) Abnormal heap growth and CPU usage during repair.
Date Tue, 25 Jul 2017 08:33:00 GMT


Stefan Podkowinski commented on CASSANDRA-13687:

Can you make sure to disable DEBUG logging for the MerkleTree class?

> Abnormal heap growth and CPU usage during repair.
> -------------------------------------------------
>                 Key: CASSANDRA-13687
>                 URL:
>             Project: Cassandra
>          Issue Type: Bug
>            Reporter: Stanislav Vishnevskiy
>         Attachments: 3.0.14cpu.png, 3.0.14heap.png, 3.0.14.png, 3.0.9heap.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 versions 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 during repair.

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