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From "Jonathan Ellis (JIRA)" <>
Subject [jira] [Resolved] (CASSANDRA-5033) Keep intransit mutation tracking off heap
Date Tue, 19 Nov 2013 23:21:27 GMT


Jonathan Ellis resolved CASSANDRA-5033.

    Resolution: Later

Pretty sure reducing write timeouts (and hence queued mutations) has fixed this.

> Keep intransit mutation tracking off heap
> -----------------------------------------
>                 Key: CASSANDRA-5033
>                 URL:
>             Project: Cassandra
>          Issue Type: New Feature
>          Components: Core
>    Affects Versions: 1.1.0
>            Reporter: T Jake Luciani
> When a node is down and writes are timing out to that node the coordinator keeps the
mutation in memory and writes out the hint on timeout.  
> The problem is under heavy write load these mutations pile up quite a bit (when CL is
low).  It causes a lot of heap pressure and causes a lot of problems (which shouldn't happen
just because a node is down)
> If we serialized the mutation and put it in a off heap cache vs on head we could avoid
this problem.

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