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From "Patrick Bannister (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-13889) cfstats should take sorting and limit parameters
Date Sun, 01 Apr 2018 01:51:00 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-13889?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16421554#comment-16421554
] 

Patrick Bannister commented on CASSANDRA-13889:
-----------------------------------------------

I'm thinking that command line usage should support sort keys corresponding to the keys used
in the TableStatsHolder convert2Map function. They're more verbose than I'd like, but I felt
that creating a whole new nomenclature was the worse choice.

However, I am supporting a few alternative short forms for keys I expect to get common use:
 * "read_latency" as a short form of "local_read_latency_ms"
 * "reads" as a short form of "local_read_count"
 * "write_latency" as a short form of "local_write_latency_ms"
 * "writes" as a short form of "local_write_count"

I cringe a bit at "average_live_cells_per_slice_last_five_minutes", but I also didn't want
to blow up the command line usage hint with alternate short forms of every key.

> cfstats should take sorting and limit parameters
> ------------------------------------------------
>
>                 Key: CASSANDRA-13889
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-13889
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Tools
>            Reporter: Jon Haddad
>            Assignee: Patrick Bannister
>            Priority: Major
>             Fix For: 4.0
>
>         Attachments: sample_output_normal.txt, sample_output_sorted.txt, sample_output_sorted_top3.txt
>
>
> When looking at a problematic node I'm not familiar with, one of the first things I do
is check cfstats to identify the tables with the most reads, writes, and data.  This is fine
as long as there aren't a lot of tables but once it goes above a dozen it's quite difficult.
 cfstats should allow me to sort the results and limit to top K tables.



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