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From Jonathan Ellis <jbel...@gmail.com>
Subject Re: HintedHandoffEnabled
Date Mon, 31 May 2010 19:11:25 GMT
Ah... no, that's just its "is there anything to deliver" check.
Basically a no-op if there are no data files left.

On Mon, May 31, 2010 at 2:05 PM, Ran Tavory <rantav@gmail.com> wrote:
> I deleted all files in the system dir, including hints before starting the
> servers.
> It's not a big deal. but can it be something else?
>
> On Mon, May 31, 2010 at 9:53 PM, Jonathan Ellis <jbellis@gmail.com> wrote:
>>
>> 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
>
>



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

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