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From Igor <i...@4friends.od.ua>
Subject 1.2.3 and 1.2.4 memory usage growth on idle cluster
Date Thu, 25 Apr 2013 09:30:27 GMT
Hello

Does  anybody seen memory problems on idle cluster?
I have 8-node ring with cassandra 1.2.3 which never been used and stay 
idle for several weeks. Yesterday when I decided to upgrade it to 1.2.4 
I found lot of messages like

INFO 11:10:56,273 GC for ParNew: 1039 ms for 1 collections, 6631277912 
used; max is 10630070272
  INFO 11:10:56,273 Pool Name                    Active   Pending Blocked
  INFO 11:10:56,275 ReadStage                         0 0         0
  INFO 11:10:56,276 RequestResponseStage              0 0         0
  INFO 11:10:56,276 ReadRepairStage                   0 0         0
  INFO 11:10:56,277 MutationStage                     0 0         0
  INFO 11:10:56,277 ReplicateOnWriteStage             0 0         0
  INFO 11:10:56,278 GossipStage                       0 0         0
  INFO 11:10:56,278 AntiEntropyStage                  0 0         0
  INFO 11:10:56,278 MigrationStage                    0 0         0
  INFO 11:10:56,279 MemtablePostFlusher               0 0         0
  INFO 11:10:56,279 FlushWriter                       0 0         0
  INFO 11:10:56,280 MiscStage                         0 0         0
  INFO 11:10:56,280 commitlog_archiver                0 0         0
  INFO 11:10:56,280 InternalResponseStage             0 0         0
  INFO 11:10:56,281 HintedHandoff                     0 0         0
  INFO 11:10:56,281 CompactionManager                 0         0
  INFO 11:10:56,281 MessagingService                n/a       0,0
  INFO 11:10:56,281 Cache Type Size                 
Capacity               KeysToSave
                                                         Provider
  INFO 11:10:56,281 KeyCache 7368                
104857600                      all

  INFO 11:10:56,281 RowCache 0                        
0                      all
              org.apache.cassandra.cache.SerializingCacheProvider
  INFO 11:10:56,281 ColumnFamily                Memtable ops,data
  INFO 11:10:56,281 system.local                             4,52
  INFO 11:10:56,281 system.peers                          30,6093
  INFO 11:10:56,282 system.batchlog                           0,0
  INFO 11:10:56,282 system.NodeIdInfo                         0,0
  INFO 11:10:56,282 system.LocationInfo                       0,0
  INFO 11:10:56,282 system.Schema                             0,0
  INFO 11:10:56,282 system.Migrations                         0,0
  INFO 11:10:56,282 system.schema_keyspaces                   0,0
  INFO 11:10:56,282 system.schema_columns                     0,0
  INFO 11:10:56,282 system.schema_columnfamilies                 0,0
  INFO 11:10:56,282 system.IndexInfo                          0,0
  INFO 11:10:56,282 system.range_xfers                        0,0
  INFO 11:10:56,282 system.peer_events                        0,0
  INFO 11:10:56,283 system.hints                              0,0
  INFO 11:10:56,283 system.HintsColumnFamily                  0,0
  INFO 11:10:56,283 system_auth.users                         0,0
  INFO 11:10:56,283 system_traces.sessions                    0,0
  INFO 11:10:56,283 system_traces.events                      0,0
  INFO 11:11:21,205 GC for ParNew: 1035 ms for 1 collections, 6633037168 
used; max is 10630070272

So you can see - there is no any activity. And what I can see from the 
java heap graph - it constantly grow. I plan to use this ring in prod, 
but this strange behaviour confuses me.


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