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From "Benjamin Lerer (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CASSANDRA-11593) getFunctions methods produce too much garbage
Date Mon, 02 May 2016 12:23:12 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-11593?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Benjamin Lerer updated CASSANDRA-11593:
---------------------------------------
    Attachment: 11593-trunk.txt
                11593-3.0.txt

> getFunctions methods produce too much garbage
> ---------------------------------------------
>
>                 Key: CASSANDRA-11593
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-11593
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Benjamin Lerer
>            Assignee: Benjamin Lerer
>             Fix For: 3.x
>
>         Attachments: 11593-3.0.txt, 11593-trunk.txt
>
>
> While profiling an heavy write workload on a single machine, I discover that calls to
{{getFunctions}} were producing a lot of garbage.
> Internally, the getFunctions method use {{Iterators}} or {{Iterables}} functions that
creates new immutable collections at each level.
> As {{getFunctions}} is called for each SELECT, INSERT, UPDATE or DELETE through the {{checkAccess}}
method the impact is not neglectable. 



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