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Posted to commits@cassandra.apache.org by "Chris Lohfink (JIRA)" <ji...@apache.org> on 2019/06/26 16:19:00 UTC
[jira] [Comment Edited] (CASSANDRA-14670) Table Metrics Virtual
Table
[ https://issues.apache.org/jira/browse/CASSANDRA-14670?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16873481#comment-16873481 ]
Chris Lohfink edited comment on CASSANDRA-14670 at 6/26/19 4:18 PM:
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Made recommended changes and Jon took another quick look.
Thanks, committed as [07ff9e57344f1d837e4aef3cbca26b953745bcd7|https://github.com/apache/cassandra/commit/07ff9e57344f1d837e4aef3cbca26b953745bcd7].
was (Author: cnlwsu):
Made recommended changes and Jon took another quick look.
Thanks, committed as [07ff9e57344f1d837e4aef3cbca26b953745bcd7|[https://github.com/apache/cassandra/commit/07ff9e57344f1d837e4aef3cbca26b953745bcd7]].
> Table Metrics Virtual Table
> ---------------------------
>
> Key: CASSANDRA-14670
> URL: https://issues.apache.org/jira/browse/CASSANDRA-14670
> Project: Cassandra
> Issue Type: Improvement
> Components: Legacy/CQL, Legacy/Observability
> Reporter: Chris Lohfink
> Assignee: Chris Lohfink
> Priority: Low
> Labels: pull-request-available, virtual-tables
> Fix For: 4.0.x
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> Different than CASSANDRA-14572 whose goal is to expose all metrics. This is to expose a few hand tailored tables that are particularly useful in debugging slow Cassandra instances (in my experience). These are useful in finding out which table it is that is having issues if you see a node performing poorly in general. This can kinda be figured out with cfstats sorting and some clever bash-foo but its been a bit of a operational UX pain for me personally for awhile.
> examples:
> {code}
> cqlsh> select * from system_views.max_partition_size limit 5;
> max_partition_size | keyspace_name | table_name
> --------------------+---------------+----------------
> 126934 | system | size_estimates
> 9887 | system_schema | columns
> 9887 | system_schema | tables
> 6866 | system | local
> 258 | keyspace1 | standard1
> (5 rows)
> cqlsh> select * from system_views.local_reads limit 5 ;
> count | keyspace_name | table_name | 99th | max | median | per_second
> -------+---------------+-----------------+-----------+-----------+---------+------------
> 23 | system | local | 186563160 | 186563160 | 1629722 | 3.56101
> 22 | system_schema | tables | 4055269 | 4055269 | 454826 | 3.72452
> 14 | system_schema | columns | 1131752 | 1131752 | 545791 | 2.37015
> 14 | system_schema | dropped_columns | 126934 | 126934 | 88148 | 2.37015
> 14 | system_schema | indexes | 219342 | 219342 | 152321 | 2.37015
> (5 rows)
> cqlsh> select * from system_views.coordinator_reads limit 5;
> count | keyspace_name | table_name | 99th | max | median | per_second
> -------+---------------+------------+------+-----+--------+------------
> 2 | system | local | 0 | 0 | 0 | 0.005324
> 1 | system_auth | roles | 0 | 0 | 0 | 0.002662
> 0 | basic | wide | 0 | 0 | 0 | 0
> 0 | basic | wide3 | 0 | 0 | 0 | 0
> 0 | keyspace1 | counter1 | 0 | 0 | 0 | 0
> (5 rows)
> {code}
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