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https://issues.apache.org/jira/browse/CASSANDRA-5033?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jonathan Ellis resolved CASSANDRA-5033.
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Resolution: Later
Pretty sure reducing write timeouts (and hence queued mutations) has fixed this.
> Keep intransit mutation tracking off heap
> -----------------------------------------
>
> Key: CASSANDRA-5033
> URL: https://issues.apache.org/jira/browse/CASSANDRA-5033
> 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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