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Posted to commits@cassandra.apache.org by "Jonathan Ellis (JIRA)" <ji...@apache.org> on 2011/02/08 21:37:57 UTC

[jira] Updated: (CASSANDRA-2142) Add "reduce memory usage because I tuned things poorly" feature

     [ https://issues.apache.org/jira/browse/CASSANDRA-2142?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

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: https://issues.apache.org/jira/browse/CASSANDRA-2142
>             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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