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From "Jonathan Ellis (JIRA)" <>
Subject [jira] Updated: (CASSANDRA-2053) Make cache saving less contentious
Date Tue, 01 Feb 2011 17:50:29 GMT


Jonathan Ellis updated CASSANDRA-2053:

    Attachment: 2053.txt

Moves CacheWriter to a top-level class and runs it on the CompactionManager executor.  Reads
and writes udpated to use BRAF cache-non-polluting mode.

> Make cache saving less contentious
> ----------------------------------
>                 Key: CASSANDRA-2053
>                 URL:
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 0.7.0
>            Reporter: Nick Bailey
>             Fix For: 0.7.2
>         Attachments: 2053.txt
> The current default for saving key caches is every hour.  Additionally the default timeout
for flushing memtables is every hour.  I've seen situations where both of these occuring at
the same time every hour causes enough pressure on the node to have it drop messages and other
nodes mark it dead.  This happens across the cluster and results in flapping.
> We should do something to spread this out. Perhaps staggering cache saves/flushes that
occur due to timeouts.

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