This is a cluster of 2 nodes, each having 8G of operating memory, replicationfactor=2 Write/read pressure is quite low and almost never exceeds 10/second
>From time to time (2-3 times in a month) I see GC activity in logs and for >this time cassandra stops responding to requests which results in a timeout in >upper-layer application. Total time of unavailability can be over 5 minues >(like in the following case) What can I do with that? Wiil it become much worse when my cluster grows up? INFO [GossipTasks:1] 2012-07-16 13:10:50,055 Gossiper.java (line 736) InetAddress /10.220.50.9 is now dead. INFO [ScheduledTasks:1] 2012-07-16 13:10:50,056 GCInspector.java (line 123) GC for ParNew: 391383 ms for 1 collections, 2025808488 used; max is 8464105472 INFO [ScheduledTasks:1] 2012-07-16 13:10:50,067 StatusLogger.java (line 50) Pool Name Active Pending Blocked INFO [ScheduledTasks:1] 2012-07-16 13:10:50,071 StatusLogger.java (line 65) ReadStage 0 0 0 INFO [ScheduledTasks:1] 2012-07-16 13:10:50,071 StatusLogger.java (line 65) RequestResponseStage 0 0 0 INFO [ScheduledTasks:1] 2012-07-16 13:10:50,072 StatusLogger.java (line 65) ReadRepairStage 0 0 0 INFO [ScheduledTasks:1] 2012-07-16 13:10:50,072 StatusLogger.java (line 65) MutationStage 0 0 0 INFO [ScheduledTasks:1] 2012-07-16 13:10:50,073 StatusLogger.java (line 65) ReplicateOnWriteStage 0 0 0 INFO [GossipStage:1] 2012-07-16 13:10:50,074 Gossiper.java (line 722) InetAddress /10.220.50.9 is now UP INFO [ScheduledTasks:1] 2012-07-16 13:10:50,075 StatusLogger.java (line 65) GossipStage 1 59 0 INFO [ScheduledTasks:1] 2012-07-16 13:10:50,075 StatusLogger.java (line 65) AntiEntropyStage 0 0 0 INFO [ScheduledTasks:1] 2012-07-16 13:10:50,076 StatusLogger.java (line 65) MigrationStage 0 0 0 INFO [ScheduledTasks:1] 2012-07-16 13:10:50,076 StatusLogger.java (line 65) StreamStage 0 0 0 INFO [ScheduledTasks:1] 2012-07-16 13:10:50,077 StatusLogger.java (line 65) MemtablePostFlusher 0 0 0 INFO [ScheduledTasks:1] 2012-07-16 13:10:50,077 StatusLogger.java (line 65) FlushWriter 0 0 0 INFO [ScheduledTasks:1] 2012-07-16 13:10:50,077 StatusLogger.java (line 65) MiscStage 0 0 0 INFO [ScheduledTasks:1] 2012-07-16 13:10:50,078 StatusLogger.java (line 65) InternalResponseStage 0 0 0 INFO [ScheduledTasks:1] 2012-07-16 13:10:50,078 StatusLogger.java (line 65) HintedHandoff 0 0 0 INFO [ScheduledTasks:1] 2012-07-16 13:10:50,079 StatusLogger.java (line 69) CompactionManager n/a 0 INFO [ScheduledTasks:1] 2012-07-16 13:10:50,079 StatusLogger.java (line 81) MessagingService n/a 0,0 INFO [ScheduledTasks:1] 2012-07-16 13:10:50,080 StatusLogger.java (line 85) ColumnFamily Memtable ops,data Row cache size/cap Key cache size/cap INFO [ScheduledTasks:1] 2012-07-16 13:10:50,080 StatusLogger.java (line 88) Keyspace1.PSS 36712,343842617 0/0 97995/1000000 INFO [ScheduledTasks:1] 2012-07-16 13:10:50,085 StatusLogger.java (line 88) Keyspace1.Standard1 128679,162567721 0/0 0/1000000 INFO [ScheduledTasks:1] 2012-07-16 13:10:50,085 StatusLogger.java (line 88) system.NodeIdInfo 0,0 0/0 0/1 INFO [ScheduledTasks:1] 2012-07-16 13:10:50,086 StatusLogger.java (line 88) system.IndexInfo 0,0 0/0 0/1 INFO [ScheduledTasks:1] 2012-07-16 13:10:50,086 StatusLogger.java (line 88) system.LocationInfo 0,0 0/0 1/2 INFO [ScheduledTasks:1] 2012-07-16 13:10:50,086 StatusLogger.java (line 88) system.Migrations 0,0 0/0 3/3 INFO [ScheduledTasks:1] 2012-07-16 13:10:50,087 StatusLogger.java (line 88) system.HintsColumnFamily 1,528 0/0 0/1 INFO [ScheduledTasks:1] 2012-07-16 13:10:50,087 StatusLogger.java (line 88) system.Schema 0,0 0/0 2/3 -------- Завершение пересылаемого сообщения --------
