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From Joel Samuelsson <samuelsson.j...@gmail.com>
Subject Re: Reduce Cassandra GC
Date Tue, 18 Jun 2013 15:48:21 GMT
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.
>>>>>
>>>>
>>>>
>>>
>>
>

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