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From Jason Tang <ares.t...@gmail.com>
Subject GCInspector works every 10 seconds!
Date Sun, 17 Jun 2012 12:16:43 GMT
Hi

   After running load testing for 24 hours(insert, update and delete), now
no new traffic to Cassandra, but Cassnadra shows still have high load(CPU
usage), from the system.log, it shows it always perform GC. I don't know
why it work as that, seems memory is not low.

Here is some configuration and log, where I can find the clue why Cassandra
works as this?

cassandra.yaml
disk_access_mode: mmap_index_only

#  /opt/cassandra/bin/nodetool -h 127.0.0.1 -p 6080 tpstats
Pool Name                    Active   Pending      Completed   Blocked  All
time blocked
ReadStage                         0         0            45387558         0
                0
RequestResponseStage      0         0            96568347         0
        0
MutationStage                    0         0            60215102         0
                0
ReadRepairStage                0         0              0
0                 0
ReplicateOnWriteStage       0         0              0                   0
                0
GossipStage                      0         0             399012
 0                 0
AntiEntropyStage               0         0              0
 0                 0
MigrationStage                   0         0             30
  0                 0
MemtablePostFlusher         0         0             279                 0
              0
StreamStage                      0         0              0
  0                 0
FlushWriter                        0         0             1846
  0              1052
MiscStage                         0         0              0
     0                 0
InternalResponseStage       0         0              0                    0
                0
HintedHandoff                     0         0              5
     0                 0

Message type           Dropped
RANGE_SLICE                  0
READ_REPAIR                  0
BINARY                       0
READ                         1
MUTATION                  1390
REQUEST_RESPONSE             0


 # /opt/cassandra/bin/nodetool -h 127.0.0.1 -p 6080 info
Token            : 56713727820156410577229101238628035242
Gossip active    : true
Load             : 37.57 GB
Generation No    : 1339813956
Uptime (seconds) : 120556
Heap Memory (MB) : 3261.14 / 5984.00
Data Center      : datacenter1
Rack             : rack1
Exceptions       : 0


 INFO [ScheduledTasks:1] 2012-06-17 19:47:36,633 GCInspector.java (line
123) GC for ParNew: 222 ms for 1 collections, 2046077640 used; max
is 6274678784
 INFO [ScheduledTasks:1] 2012-06-17 19:48:41,714 GCInspector.java (line
123) GC for ParNew: 262 ms for 1 collections, 2228128408 used; max
is 6274678784
 INFO [ScheduledTasks:1] 2012-06-17 19:48:49,717 GCInspector.java (line
123) GC for ParNew: 237 ms for 1 collections, 2390412728 used; max
is 6274678784
 INFO [ScheduledTasks:1] 2012-06-17 19:48:57,719 GCInspector.java (line
123) GC for ParNew: 223 ms for 1 collections, 2508702896 used; max
is 6274678784
 INFO [ScheduledTasks:1] 2012-06-17 19:50:01,988 GCInspector.java (line
123) GC for ParNew: 232 ms for 1 collections, 2864574832 used; max
is 6274678784
 INFO [ScheduledTasks:1] 2012-06-17 19:50:10,075 GCInspector.java (line
123) GC for ParNew: 208 ms for 1 collections, 2964629856 used; max
is 6274678784
 INFO [ScheduledTasks:1] 2012-06-17 19:50:21,078 GCInspector.java (line
123) GC for ParNew: 258 ms for 1 collections, 3149127368 used; max
is 6274678784
 INFO [ScheduledTasks:1] 2012-06-17 19:51:26,095 GCInspector.java (line
123) GC for ParNew: 213 ms for 1 collections, 3421495400 used; max
is 6274678784
 INFO [ScheduledTasks:1] 2012-06-17 19:51:34,097 GCInspector.java (line
123) GC for ParNew: 218 ms for 1 collections, 3543978312 used; max
is 6274678784
 INFO [ScheduledTasks:1] 2012-06-17 19:52:37,229 GCInspector.java (line
123) GC for ParNew: 221 ms for 1 collections, 3752290000 used; max
is 6274678784
 INFO [ScheduledTasks:1] 2012-06-17 19:52:37,230 GCInspector.java (line
123) GC for ConcurrentMarkSweep: 206 ms for 1 collections, 3752313400 used;
max is 6274678784
 INFO [ScheduledTasks:1] 2012-06-17 19:52:46,507 GCInspector.java (line
123) GC for ParNew: 243 ms for 1 collections, 3663162192 used; max
is 6274678784
 INFO [ScheduledTasks:1] 2012-06-17 19:52:54,510 GCInspector.java (line
123) GC for ParNew: 283 ms for 1 collections, 1582282248 used; max
is 6274678784
 INFO [ScheduledTasks:1] 2012-06-17 19:54:01,704 GCInspector.java (line
123) GC for ParNew: 235 ms for 1 collections, 1935534800 used; max
is 6274678784
 INFO [ScheduledTasks:1] 2012-06-17 19:55:13,747 GCInspector.java (line
123) GC for ParNew: 233 ms for 1 collections, 2356975504 used; max
is 6274678784
 INFO [ScheduledTasks:1] 2012-06-17 19:55:21,749 GCInspector.java (line
123) GC for ParNew: 264 ms for 1 collections, 2530976328 used; max
is 6274678784
 INFO [ScheduledTasks:1] 2012-06-17 19:55:29,794 GCInspector.java (line
123) GC for ParNew: 224 ms for 1 collections, 2592311336 used; max
is 6274678784


BRs
//Ares

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