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Posted to user@cassandra.apache.org by Parag Patel <pp...@clearpoolgroup.com> on 2014/04/09 12:06:32 UTC

RE: Commit logs building up

Nate,

What values for the FlushWriter line would draw concern to you?  What is the difference between Blocked and All Time Blocked?

Parag

From: Nate McCall [mailto:nate@thelastpickle.com]
Sent: Thursday, February 27, 2014 4:22 PM
To: Cassandra Users
Subject: Re: Commit logs building up

What was the impetus for turning up the commitlog_segment_size_in_mb?

Also, in nodetool tpstats, do what are the values for the FlushWriter line?

On Wed, Feb 26, 2014 at 12:18 PM, Christopher Wirt <ch...@struq.com>> wrote:
We're running 2.0.5, recently upgraded from 1.2.14.

Sometimes we are seeing CommitLogs starting to build up.

Is this a potential bug? Or a symptom of something else we can easily address?

We have
commitlog_sync: periodic
commitlog_sync_period_in_ms:10000
commitlog_segment_size_in_mb: 512

Thanks,
Chris

--
-----------------
Nate McCall
Austin, TX
@zznate

Co-Founder & Sr. Technical Consultant
Apache Cassandra Consulting
http://www.thelastpickle.com

Re: Commit logs building up

Posted by Robert Coli <rc...@eventbrite.com>.

On Wed, Apr 9, 2014 at 3:06 AM, Parag Patel <pp...@clearpoolgroup.com>wrote:
>
> What values for the FlushWriter line would draw concern to you?  What is
> the difference between Blocked and All Time Blocked?
>

Non-zero "all time blocked". Because if the FlushWriter is blocked, you
probably don't have enough io to flush quickly enough.

Blocked is currently blocked, all time blocked is blocked since node
startup.

=Rob