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From "Jonathan Ellis (JIRA)" <>
Subject [jira] Updated: (CASSANDRA-2142) Add "reduce memory usage because I tuned things poorly" feature
Date Tue, 08 Feb 2011 20:37:57 GMT


Jonathan Ellis updated CASSANDRA-2142:

    Attachment: 2142.txt

adds StorageService.reduceHeapUsage, which flushes the largest memtables and caps cache size
when GCInspector notices that heap post-full-collection is within a configurable threshold
of completely full.

The threshold defaults to 100% if it is not specified in .yaml (i.e., off for people upgrading)
and 95% in the sample .yaml.

> Add "reduce memory usage because I tuned things poorly" feature
> ---------------------------------------------------------------
>                 Key: CASSANDRA-2142
>                 URL:
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Jonathan Ellis
>            Assignee: Jonathan Ellis
>            Priority: Minor
>              Labels: ponies
>             Fix For: 0.7.1
>         Attachments: 2142.txt
> Users frequently create too many columnfamilies, set the memtable thresholds too high
(or adjust throughput while ignoring operations), and/or set caching thresholds too high.
 Then their server OOMs and they tell their friends Cassandra sucks.

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