incubator-cassandra-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Jonathan Ellis <jbel...@gmail.com>
Subject Re: HintedHandoffEnabled
Date Mon, 31 May 2010 18:53:56 GMT
disabling hinted handoff will prevent creation of new hints, but it
will continue to attempt to deliver existing ones unless you manually
delete the hint files in the system/ dir.

On Mon, May 31, 2010 at 6:04 AM, Ran Tavory <rantav@gmail.com> wrote:
> In 0.6.2 I disabled hinted handoff, however tpstats and cfstats report seems
> odd.
> On all servers in the cluster I have:
>  <HintedHandoffEnabled>false</HintedHandoffEnabled>
> tpstats reports 5 completed handoffs.
> $ nodetool -h cass25 -p 9004 tpstats
> Pool Name                    Active   Pending      Completed
> FILEUTILS-DELETE-POOL             0         0              2
> STREAM-STAGE                      0         0              0
> RESPONSE-STAGE                    0         0        5903099
> ROW-READ-STAGE                    0         0         669093
> LB-OPERATIONS                     0         0              0
> MESSAGE-DESERIALIZER-POOL         1         0        6595504
> GMFD                              0         0          35947
> LB-TARGET                         0         0              0
> CONSISTENCY-MANAGER               0         0         669095
> ROW-MUTATION-STAGE                0         0         644360
> MESSAGE-STREAMING-POOL            0         0              0
> LOAD-BALANCER-STAGE               0         0              0
> FLUSH-SORTER-POOL                 0         0              0
> MEMTABLE-POST-FLUSHER             0         0              7
> FLUSH-WRITER-POOL                 0         0              7
> AE-SERVICE-STAGE                  0         0              1
> HINTED-HANDOFF-POOL               0         0              5
> In data/system/* there are only LocationInfo files, so looks like hinted
> handoff is indeed disabled and cfstats does indicate there are 0 bytes,
> however it also indicates of 32 reads which I didn't expect (cluster has
> been up for a few hours).
> $ nodetool -h cass25 -p 9004 tpstats
> ...
>                 Column Family: HintsColumnFamily
>                 SSTable count: 0
>                 Space used (live): 0
>                 Space used (total): 0
>                 Memtable Columns Count: 0
>                 Memtable Data Size: 0
>                 Memtable Switch Count: 0
>                 Read Count: 32
>                 Read Latency: 0.062 ms.
>                 Write Count: 0
>                 Write Latency: NaN ms.
>                 Pending Tasks: 0
>                 Key cache capacity: 1
>                 Key cache size: 0
>                 Key cache hit rate: NaN
>                 Row cache: disabled
>                 Compacted row minimum size: 0
>                 Compacted row maximum size: 0
>                 Compacted row mean size: 0
> Any idea why is this happening?



-- 
Jonathan Ellis
Project Chair, Apache Cassandra
co-founder of Riptano, the source for professional Cassandra support
http://riptano.com

Mime
View raw message