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From "Sven Delmas (JIRA)" <>
Subject [jira] [Commented] (CASSANDRA-5037) Set CASSANDRA_HEAPDUMP_DIR in by default
Date Thu, 21 Mar 2013 18:35:18 GMT


Sven Delmas commented on CASSANDRA-5037:

Thanks, in that case I will ask docs to make sure they describe the setting of that variable.

> Set CASSANDRA_HEAPDUMP_DIR in by default
> ---------------------------------------------------------
>                 Key: CASSANDRA-5037
>                 URL:
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Config
>    Affects Versions: 1.1.7, 1.2.0 beta 3
>            Reporter: J.B. Langston
>            Priority: Minor
> Cassandra is configured via -XX:+HeapDumpOnOutOfMemoryError to trigger a heap dump at
the occurrence of an OutOfMemoryError, but unless you have set your CASSANDRA_HEAPDUMP_DIR
in, the file will be written in the Cassandra process's working directory,
which when Cassandra is run as a service is typically the root directory. Nine times out of
ten, the Cassandra process does not have permission to write here so no heap dump is created.
Even if Cassandra does have permission, the root filesystem is usually small and the heap
dump could easily fill it up with a large Xmx configured. This makes post-mortem analysis
difficult. We should set it by default to e.g. /var/log/cassandra.

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