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From S C <as...@outlook.com>
Subject RE: high pending compactions
Date Sun, 08 Jun 2014 18:57:18 GMT
How to check if there are any "stuck compactions"?


> Date: Sun, 8 Jun 2014 12:43:45 -0400
> From: wkatsak@cs.rutgers.edu
> To: user@cassandra.apache.org
> Subject: Re: high pending compactions
> 
> Have you verified that these aren't "stuck compactions"? e.g. even under 
> no load, they don't go away?
> 
> -Bill
> 
> 
> On 06/08/2014 12:32 PM, Jake Luciani wrote:
> > 2&3
> >
> > On Sunday, June 8, 2014, S C <asf11@outlook.com
> > <mailto:asf11@outlook.com>> wrote:
> >
> >     I am using Cassandra 1.1 (sorry bit old) and I am seeing high
> >     pending compaction count. "pending tasks: 67" while active
> >     compaction tasks are not more than 5. I have a 24CPU machine.
> >     Shouldn't I be seeing more compactions? Is this a pattern of high
> >     writes and compactions backing up? How can I improve this? Here are
> >     my thoughts.
> >
> >      1. Increase memtable_total_space_in_mb
> >      2. Increase compaction_throughput_mb_per_sec
> >      3. Increase concurrent_compactions
> >
> >
> >     Sorry if this was discussed already. Any pointers is much appreciated.
> >
> >     Thanks,
> >     Kumar
> >
> >
> >
> > --
> > http://twitter.com/tjake
 		 	   		  
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