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From "Liang Xie (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-8150) Simplify and enlarge new heap calculation
Date Fri, 21 Nov 2014 03:43:35 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-8150?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14220480#comment-14220480
] 

Liang Xie commented on CASSANDRA-8150:
--------------------------------------

IMHO, the MaxTenuringThreshold setting should be different per cluster, or say, per read/write
pattern. In past, when i tuned another similar NoSQL system in our internal production clusters,
i found i need to set it to different value to get a optimized status(e.g. one cluster is
3, but another cluster is 8 or sth else)
[~tjake], totally agreed with your point! i had seen several long safepoint due to using biased
locking in Hadoop system:)

> Simplify and enlarge new heap calculation
> -----------------------------------------
>
>                 Key: CASSANDRA-8150
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-8150
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Config
>            Reporter: Matt Stump
>            Assignee: Brandon Williams
>         Attachments: upload.png
>
>
> It's been found that the old twitter recommendations of 100m per core up to 800m is harmful
and should no longer be used.
> Instead the formula used should be 1/3 or 1/4 max heap with a max of 2G. 1/3 or 1/4 is
debatable and I'm open to suggestions. If I were to hazard a guess 1/3 is probably better
for releases greater than 2.1.



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