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From "Tim Freeman (JIRA)" <j...@apache.org>
Subject [jira] Created: (CASSANDRA-599) The pending tasks listed for the compaction pool is confusing
Date Thu, 03 Dec 2009 22:46:20 GMT
The pending tasks listed for the compaction pool is confusing
-------------------------------------------------------------

                 Key: CASSANDRA-599
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-599
             Project: Cassandra
          Issue Type: Improvement
          Components: Core
         Environment: RHEL 4
            Reporter: Tim Freeman
            Priority: Trivial


Using the build dated 29 Nov 09, the output from "nodeprobe tpstats" is confusing.  The following
observations were made with an idle server that was compacting to clean up after some writes
that were done in the past.  The number of pending tasks for COMPACTION-POOL starts at 1673,
and after doing some work the number of pending tasks has increased to 1675.  I'd prefer that
the amount of pending work reported by tpstats decreases as work is done.

> sh nodeprobe.sh tpstats
Pool Name                    Active   Pending      Completed
FILEUTILS-DELETE-POOL             0         0            872
MESSAGING-SERVICE-POOL            0         0              0
STREAM-STAGE                      0         0              0
RESPONSE-STAGE                    0         0         662309
ROW-READ-STAGE                    0         0         662309
LB-OPERATIONS                     0         0              0
COMMITLOG                         1         0        1189659
MESSAGE-DESERIALIZER-POOL         0         0              0
GMFD                              0         0              0
LB-TARGET                         0         0              0
CONSISTENCY-MANAGER               0         0              0
ROW-MUTATION-STAGE                0         0        1101916
MESSAGE-STREAMING-POOL            0         0              0
LOAD-BALANCER-STAGE               0         0              0
FLUSH-SORTER-POOL                 0         0           1723
MEMTABLE-POST-FLUSHER             0         0           1723
COMPACTION-POOL                   1      1673            136
FLUSH-WRITER-POOL                 0         0           1723
HINTED-HANDOFF-POOL               0         0             20
> sh nodeprobe.sh tpstats
Pool Name                    Active   Pending      Completed
FILEUTILS-DELETE-POOL             0         0            872
MESSAGING-SERVICE-POOL            0         0              0
STREAM-STAGE                      0         0              0
RESPONSE-STAGE                    0         0         662309
ROW-READ-STAGE                    0         0         662309
LB-OPERATIONS                     0         0              0
COMMITLOG                         1         0        1191173
MESSAGE-DESERIALIZER-POOL         0         0              0
GMFD                              0         0              0
LB-TARGET                         0         0              0
CONSISTENCY-MANAGER               0         0              0
ROW-MUTATION-STAGE                0         0        1101916
MESSAGE-STREAMING-POOL            0         0              0
LOAD-BALANCER-STAGE               0         0              0
FLUSH-SORTER-POOL                 0         0           1723
MEMTABLE-POST-FLUSHER             0         0           1723
COMPACTION-POOL                   1      1675            139
FLUSH-WRITER-POOL                 0         0           1723
HINTED-HANDOFF-POOL               0         0             20
(^[[01;32mroot@localhost^[[00m)^[[01;34m~/rackspace-stuff/cassandra-0.5-pre^[[00m> 

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