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From "Constance Eustace (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CASSANDRA-9640) Nodetool repair of very wide, large rows causes GC pressure and destabilization
Date Tue, 23 Jun 2015 18:44:00 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-9640?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Constance Eustace updated CASSANDRA-9640:
-----------------------------------------
    Description: 
We've noticed our nodes becoming unstable with large, unrecoverable Old Gen GCs until OOM.

This appears to be around the time of repair, and the specific cause seems to be one of our
report computation tables that involves possible very wide rows with 10GB of data in it. THis
is an RF 3 table in a four-node cluster.

We truncate this occasionally, and we also had disabled this computation report for a bit
and noticed better node stabiliy.

I wish I had more specifics. We are switching to an RF 1 table and do more proactive truncation
of the table. 

When things calm down, we will attempt to replicate the issue and watch GC and other logs.

Any suggestion for things to look for/enable tracing on would be welcome.


  was:
We've noticed our nodes becoming unstable with large, unrecoverable Old Gen GCs until OOM.

This appears to be around the time of repair, and the specific cause seems to be one of our
report computation tables that involves possible very wide rows with 1TB of data in it. THis
is an RF 3 table in a four-node cluster.

We truncate this occasionally, and we also had disabled this computation report for a bit
and noticed better node stabiliy.

I wish I had more specifics. We are switching to an RF 1 table and do more proactive truncation
of the table. 

When things calm down, we will attempt to replicate the issue and watch GC and other logs.

Any suggestion for things to look for/enable tracing on would be welcome.



> Nodetool repair of very wide, large rows causes GC pressure and destabilization
> -------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-9640
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-9640
>             Project: Cassandra
>          Issue Type: New Feature
>         Environment: AWS, ~8GB heap
>            Reporter: Constance Eustace
>            Priority: Minor
>
> We've noticed our nodes becoming unstable with large, unrecoverable Old Gen GCs until
OOM.
> This appears to be around the time of repair, and the specific cause seems to be one
of our report computation tables that involves possible very wide rows with 10GB of data in
it. THis is an RF 3 table in a four-node cluster.
> We truncate this occasionally, and we also had disabled this computation report for a
bit and noticed better node stabiliy.
> I wish I had more specifics. We are switching to an RF 1 table and do more proactive
truncation of the table. 
> When things calm down, we will attempt to replicate the issue and watch GC and other
logs.
> Any suggestion for things to look for/enable tracing on would be welcome.



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