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From "Jeff Jirsa (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CASSANDRA-14261) Compaction Profiling Improvements
Date Thu, 12 Apr 2018 16:01:00 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-14261?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jeff Jirsa updated CASSANDRA-14261:
-----------------------------------
    Status: Ready to Commit  (was: Patch Available)

> Compaction Profiling Improvements
> ---------------------------------
>
>                 Key: CASSANDRA-14261
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-14261
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Compaction
>            Reporter: Jeff Jirsa
>            Assignee: Jeff Jirsa
>            Priority: Minor
>             Fix For: 4.0
>
>         Attachments: patched-hot-threads.png, patched-tlab.png, unpatched-hot-threads-top.png,
unpatched-hot-threads.png, unpatched-tlab.png
>
>
> There's some low hanging fruit in some laptop compaction runs, such as creating a ton
of the same object unnecessarily and hashing cell names repeatedly to see if a column is dropped
even when we should know that the table has no dropped columns. 



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