cassandra-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Ran Tavory <ran...@gmail.com>
Subject HintedHandoffEnabled
Date Mon, 31 May 2010 11:04:38 GMT
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?

Mime
View raw message