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From "Paulo Motta (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-13614) Batchlog replay throttle should be dynamically configurable with jmx and possibly nodetool
Date Fri, 16 Jun 2017 23:10:01 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-13614?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16052494#comment-16052494
] 

Paulo Motta commented on CASSANDRA-13614:
-----------------------------------------

Overall looks good, just a few minor suggestions:
* I think we should also include the {{nodetool getbatchlogreplaythrottlekb}} command as well
given the JMX method is already there so the extra effort is minimum and could be handy for
admins. I see there are some setters without their corresponding getters on nodetool, but
I think we should always include both setters and getters. WDYT?
* Can you add a notice to the nodetool command help stating that {{This will be reduced proportionally
to the number of nodes in the cluster}}, similar to the YAML notice.
* Also, perhaps you could add a debug log on {{BatchLogManager.setRate}} stating the actual
rate that is being set, given it varies with the number of nodes.

> Batchlog replay throttle should be dynamically configurable with jmx and possibly nodetool
> ------------------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-13614
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-13614
>             Project: Cassandra
>          Issue Type: Sub-task
>          Components: Configuration, Materialized Views
>            Reporter: Andrés de la Peña
>            Assignee: Andrés de la Peña
>
> As it is said in [CASSANDRA-13162|https://issues.apache.org/jira/browse/CASSANDRA-13162],
batchlog replay can be excessively throttled with materialized views. The throttle is controlled
by the property {{batchlog_replay_throttle_in_kb}}, which is set by default to (only) 1024KB,
and it can't be configured dynamically. It would be useful to be able of modifying it dynamically
with JMX and possibly nodetool.



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