Yes, like I said, the only relevant output from that file was:
2013-06-17T08:11:22.300+0000: 2551.288: [GC 870971K->216494K(4018176K), 145.1887460 secs]


2013/6/18 Takenori Sato <tsato@cloudian.com>
GC logging is not in system.log. But in the following file.

JVM_OPTS="$JVM_OPTS -Xloggc:/var/log/cassandra/gc-`date +%s`.log"

At least, no GC logs are shown in your post.


On Tue, Jun 18, 2013 at 5:05 PM, Joel Samuelsson <samuelsson.joel@gmail.com> wrote:
Can't find any promotion failure.

In system.log this is what I get:
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,490 GCInspector.java (line 122) GC for ParNew: 145189 ms for 1 collections, 225905072 used; max is 4114612224
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,490 StatusLogger.java (line 57) Pool Name                    Active   Pending   Blocked
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,491 StatusLogger.java (line 72) ReadStage                         0         0         0
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,492 StatusLogger.java (line 72) RequestResponseStage              0         0         0
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,492 StatusLogger.java (line 72) ReadRepairStage                   0         0         0
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,492 StatusLogger.java (line 72) MutationStage                     0         0         0
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,493 StatusLogger.java (line 72) ReplicateOnWriteStage             0         0         0
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,493 StatusLogger.java (line 72) GossipStage                       0         0         0
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,493 StatusLogger.java (line 72) AntiEntropyStage                  0         0         0
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,494 StatusLogger.java (line 72) MigrationStage                    0         0         0
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,494 StatusLogger.java (line 72) StreamStage                       0         0         0
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,494 StatusLogger.java (line 72) MemtablePostFlusher               0         0         0
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,495 StatusLogger.java (line 72) FlushWriter                       0         0         0
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,495 StatusLogger.java (line 72) MiscStage                         0         0         0
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,499 StatusLogger.java (line 72) commitlog_archiver                0         0         0
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,499 StatusLogger.java (line 72) InternalResponseStage             0         0         0
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,499 StatusLogger.java (line 72) HintedHandoff                     0         0         0
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,500 StatusLogger.java (line 77) CompactionManager                 0         0
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,500 StatusLogger.java (line 89) MessagingService                n/a       0,0
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,500 StatusLogger.java (line 99) Cache Type     Size    Capacity    KeysToSave  Provider
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,504 StatusLogger.java (line 100) KeyCache      12129   2184533     all                                                                 
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,505 StatusLogger.java (line 106) RowCache      0       0           all         org.apache.cassandra.cache.SerializingCacheProvider
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,505 StatusLogger.java (line 113) ColumnFamily                Memtable ops,data
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,505 StatusLogger.java (line 116) system.NodeIdInfo                         0,0
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,505 StatusLogger.java (line 116) system.IndexInfo                          0,0
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,505 StatusLogger.java (line 116) system.LocationInfo                       0,0
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,506 StatusLogger.java (line 116) system.Versions                         3,103
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,506 StatusLogger.java (line 116) system.schema_keyspacees                   0,0
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,506 StatusLogger.java (line 116) system.Migrations                         0,0
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,506 StatusLogger.java (line 116) system.schema_columnfamilies                 0,0
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,506 StatusLogger.java (line 116) system.schema_columns                     0,0
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,507 StatusLogger.java (line 116) system.HintsColumnFamily                  0,0
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,507 StatusLogger.java (line 116) system.Schema                             0,0
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,507 StatusLogger.java (line 116) Keyspace.cf01                 0,0
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,507 StatusLogger.java (line 116) Keyspace.cf02                 0,0
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,507 StatusLogger.java (line 116) Keyspace.cf03                 0,0
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,508 StatusLogger.java (line 116) Keyspace.cf04                 0,0
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,508 StatusLogger.java (line 116) Keyspace.cf05                 0,0
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,508 StatusLogger.java (line 116) Keyspace.cf06                 0,0
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,508 StatusLogger.java (line 116) Keyspace.cf07                 0,0
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,508 StatusLogger.java (line 116) Keyspace.cf08                 0,0
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,508 StatusLogger.java (line 116) Keyspace.cf09                 0,0
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,509 StatusLogger.java (line 116) Keyspace.cf10                 0,0
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,509 StatusLogger.java (line 116) Keyspace.cf11                 0,0
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,509 StatusLogger.java (line 116) Keyspace.cf12                 0,0
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,509 StatusLogger.java (line 116) Keyspace.cf13                 0,0
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,509 StatusLogger.java (line 116) Keyspace.cf14                 0,0
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,510 StatusLogger.java (line 116) Keyspace.cf15                 0,0
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,510 StatusLogger.java (line 116) Keyspace.cf16                 0,0
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,510 StatusLogger.java (line 116) Keyspace.cf17                 0,0
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,510 StatusLogger.java (line 116) Keyspace.cf18                 0,0
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,510 StatusLogger.java (line 116) Keyspace.cf19                 0,0
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,511 StatusLogger.java (line 116) Keyspace.cf20                 0,0
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,511 StatusLogger.java (line 116) Keyspace.cf21                 0,0
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,511 StatusLogger.java (line 116) Keyspace.cf22                 0,0
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,511 StatusLogger.java (line 116) Keyspace.cf23                 0,0
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,511 StatusLogger.java (line 116) Keyspace.cf24                 0,0
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,512 StatusLogger.java (line 116) Keyspace.cf25                 0,0
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,512 StatusLogger.java (line 116) Keyspace.cf26                 0,0
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,512 StatusLogger.java (line 116) StressKeyspace.StressStandard                 0,0
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,512 StatusLogger.java (line 116) testing_Keyspace.cf01                 0,0
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,512 StatusLogger.java (line 116) testing_Keyspace.cf02                 0,0
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,513 StatusLogger.java (line 116) testing_Keyspace.cf03                 0,0
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,513 StatusLogger.java (line 116) testing_Keyspace.cf04                 0,0
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,513 StatusLogger.java (line 116) testing_Keyspace.cf05                 0,0
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,513 StatusLogger.java (line 116) testing_Keyspace.cf06                 0,0
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,513 StatusLogger.java (line 116) testing_Keyspace.cf07                 0,0
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,514 StatusLogger.java (line 116) testing_Keyspace.cf08                 0,0
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,514 StatusLogger.java (line 116) testing_Keyspace.cf09                 0,0
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,514 StatusLogger.java (line 116) testing_Keyspace.cf10                 0,0
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,514 StatusLogger.java (line 116) testing_Keyspace.cf11                 0,0
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,514 StatusLogger.java (line 116) testing_Keyspace.cf12                 0,0
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,515 StatusLogger.java (line 116) testing_Keyspace.cf13                 0,0
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,515 StatusLogger.java (line 116) testing_Keyspace.cf14                 0,0
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,515 StatusLogger.java (line 116) testing_Keyspace.cf15                 0,0
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,515 StatusLogger.java (line 116) testing_Keyspace.cf16                 0,0
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,515 StatusLogger.java (line 116) testing_Keyspace.cf17                 0,0
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,516 StatusLogger.java (line 116) testing_Keyspace.cf18                 0,0
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,516 StatusLogger.java (line 116) testing_Keyspace.cf19                 0,0
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,516 StatusLogger.java (line 116) testing_Keyspace.cf20                 0,0
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,516 StatusLogger.java (line 116) testing_Keyspace.cf21                 0,0
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,517 StatusLogger.java (line 116) testing_Keyspace.cf22                 0,0
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,517 StatusLogger.java (line 116) OpsCenter.rollups7200                     0,0
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,517 StatusLogger.java (line 116) OpsCenter.rollups86400                    0,0
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,517 StatusLogger.java (line 116) OpsCenter.rollups60             13745,3109686
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,517 StatusLogger.java (line 116) OpsCenter.events                       18,826
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,518 StatusLogger.java (line 116) OpsCenter.rollups300              2516,570931
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,519 StatusLogger.java (line 116) OpsCenter.pdps                    9072,160850
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,519 StatusLogger.java (line 116) OpsCenter.events_timeline                3,86
 INFO [ScheduledTasks:1] 2013-06-17 08:13:47,520 StatusLogger.java (line 116) OpsCenter.settings                        0,0

And from gc-1371454124.log I get:
2013-06-17T08:11:22.300+0000: 2551.288: [GC 870971K->216494K(4018176K), 145.1887460 secs]


2013/6/18 Takenori Sato <tsato@cloudian.com>
Find "promotion failure". Bingo if it happened at the time.

Otherwise, post the relevant portion of the log here. Someone may find a hint.


On Mon, Jun 17, 2013 at 5:51 PM, Joel Samuelsson <samuelsson.joel@gmail.com> wrote:
Just got a very long GC again. What am I to look for in the logging I just enabled?


2013/6/17 Joel Samuelsson <samuelsson.joel@gmail.com>
> If you are talking about 1.2.x then I also have memory problems on the idle cluster: java memory constantly slow grows up to limit, then spend long time for GC. I never seen such behaviour for  1.0.x and 1.1.x, where on idle cluster java memory stay on the same value.

No I am running Cassandra 1.1.8.

> Can you paste you gc config?

I believe the relevant configs are these:
# GC tuning options
JVM_OPTS="$JVM_OPTS -XX:+UseParNewGC" 
JVM_OPTS="$JVM_OPTS -XX:+UseConcMarkSweepGC" 
JVM_OPTS="$JVM_OPTS -XX:+CMSParallelRemarkEnabled" 
JVM_OPTS="$JVM_OPTS -XX:SurvivorRatio=8" 
JVM_OPTS="$JVM_OPTS -XX:MaxTenuringThreshold=1"
JVM_OPTS="$JVM_OPTS -XX:CMSInitiatingOccupancyFraction=75"
JVM_OPTS="$JVM_OPTS -XX:+UseCMSInitiatingOccupancyOnly"

I haven't changed anything in the environment config up until now. 

Also can you take a heap dump at 2 diff points so that we can compare it?

I can't access the machine at all during the stop-the-world freezes. Was that what you wanted me to try?

Uncomment the followings in "cassandra-env.sh".
Done. Will post results as soon as I get a new stop-the-world gc.

If you are unable to find a JIRA, file one

Unless this turns out to be a problem on my end, I will.