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From "Joseph Lynch (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (CASSANDRA-14747) Evaluate 200 node, compression=none, encryption=none, coalescing=off
Date Wed, 19 Sep 2018 02:06:00 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-14747?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16619974#comment-16619974
] 

Joseph Lynch edited comment on CASSANDRA-14747 at 9/19/18 2:05 AM:
-------------------------------------------------------------------

Things went much better today, after the queue fixes we no longer ran out of memory, but the
{{MessagingService-NettyOutbound-Thread}} s would be pinned at 100% cpu. We (Jason, Jordan,
myself, etc) tracked it down to various unfortunate looping behaviors in the {{OutboundMessagingConnection}}
class. We're following up with various fixes to these queueing problems. I've attached flame
graphs and ttop outputs showing what's going on on the latest version of {{jasobrown/14503-collab}}
branch.


was (Author: jolynch):
Things went much better today, after the queue fixes we no longer ran out of memory, but the
{{MessagingService-NettyOutbound-Thread}}s would be pinned at 100% cpu. We (Jason, Jordan,
myself, etc) tracked it down to various unfortunate looping behaviors in the {{OutboundMessagingConnection}}
class. We're following up with various fixes to these queueing problems. I've attached flame
graphs and ttop outputs showing what's going on on the latest version of {{jasobrown/14503-collab}}
branch.

> Evaluate 200 node, compression=none, encryption=none, coalescing=off 
> ---------------------------------------------------------------------
>
>                 Key: CASSANDRA-14747
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-14747
>             Project: Cassandra
>          Issue Type: Sub-task
>            Reporter: Joseph Lynch
>            Assignee: Joseph Lynch
>            Priority: Major
>         Attachments: 3.0.17-QPS.png, 4.0.1-QPS.png, 4.0_errors_showing_heap_pressure.txt,
4.0_heap_histogram_showing_many_MessageOuts.txt, i-0ed2acd2dfacab7c1-after-looping-fixes.svg,
useast1c-i-0e1ddfe8b2f769060-mutation-flame.svg
>
>
> Tracks evaluating a 200 node cluster with all internode settings off (no compression,
no encryption, no coalescing).



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