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From aaron morton <aa...@thelastpickle.com>
Subject Re: Large hints column family
Date Thu, 15 Mar 2012 08:51:15 GMT
Is there anything going on in the logs ? Are nodes going up and down ? Can you see any messages
about delivering hints ? 

If the query to read the hints errors it will log "HintsCF getEPPendingHints timed out" at
INFO level. 

Also checking, do the hinted_handoff_*  settings in cassandra.yaml have their default settings
?

Cheers

-----------------
Aaron Morton
Freelance Developer
@aaronmorton
http://www.thelastpickle.com

On 15/03/2012, at 8:35 AM, Bryce Godfrey wrote:

> Forgot to mention that this is on 1.0.8
>  
> From: Bryce Godfrey [mailto:Bryce.Godfrey@azaleos.com] 
> Sent: Wednesday, March 14, 2012 12:34 PM
> To: user@cassandra.apache.org
> Subject: Large hints column family
>  
> The system HintsColumnFamily seems large in my cluster, and I want to track down why
that is.  I try invoking “listEndpointsPendingHints()” for o.a.c.db.HintedHandoffManager
and it never returns, and also freezes the node that its invoked against.  It’s a 3 node
cluster, and all nodes have been up and running without issue for a while.  Any help on where
to start with this?
>  
>                Column Family: HintsColumnFamily
>                 SSTable count: 11
>                 Space used (live): 11271669539
>                 Space used (total): 11271669539
>                 Number of Keys (estimate): 1408
>                 Memtable Columns Count: 338
>                 Memtable Data Size: 0
>                 Memtable Switch Count: 1
>                 Read Count: 3
>                 Read Latency: 4354.669 ms.
>                 Write Count: 848
>                 Write Latency: 0.029 ms.
>                 Pending Tasks: 0
>                 Bloom Filter False Postives: 0
>                 Bloom Filter False Ratio: 0.00000
>                 Bloom Filter Space Used: 12656
>                 Key cache capacity: 14
>                 Key cache size: 11
>                 Key cache hit rate: 0.6666666666666666
>                 Row cache: disabled
>                 Compacted row minimum size: 105779
>                 Compacted row maximum size: 7152383774
>                 Compacted row mean size: 590818614
>  
> Thanks,
> Bryce


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