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From Nikolay Kоvshov <nkovs...@yandex.ru>
Subject Re: Cassandra 1.0 hangs during GC
Date Thu, 26 Jul 2012 06:25:02 GMT
Sun Java 6 didn't help it at all

Sar shows no special activity on the long GC times

And I have remembered that I do a lot of get_range_slices requests, each time on a range of
100, if this could be important.

Still my GC times are growing incredible

 INFO [ScheduledTasks:1] 2012-07-25 12:17:04,029 GCInspector.java (line 122) GC for ParNew:
497253 ms for 1 collections, 114036128 used; max is 8464105472
 INFO [ScheduledTasks:1] 2012-07-25 13:26:21,282 GCInspector.java (line 122) GC for ParNew:
149508 ms for 1 collections, 87015440 used; max is 8464105472
 INFO [ScheduledTasks:1] 2012-07-25 18:39:44,654 GCInspector.java (line 122) GC for ParNew:
83584 ms for 1 collections, 54368032 used; max is 8464105472
 INFO [ScheduledTasks:1] 2012-07-25 22:45:42,448 GCInspector.java (line 122) GC for ParNew:
48454 ms for 1 collections, 44072488 used; max is 8464105472


24.07.2012, 13:07, "Joost van de Wijgerd" <jwijgerd@gmail.com>:
> You are better off using Sun Java 6 to run Cassandra. In the past
> there were issues reported on 7. Can you try running it on Sun Java 6?
>
> kind regards
>
> Joost
>
> On Tue, Jul 24, 2012 at 10:04 AM, Nikolay Kоvshov <nkovshov@yandex.ru> wrote:
>
>>  48 G of Ram on that machine, swap is not used. I will disable swap at all just
in case
>>  I have 4 cassandra processes (parts of 4 different clusters), each allocated 8
GB and using 4 of them
>>> java -version
>>  java version "1.7.0"
>>  Java(TM) SE Runtime Environment (build 1.7.0-b147)
>>  Java HotSpot(TM) 64-Bit Server VM (build 21.0-b17, mixed mode)
>>
>>  23.07.2012, 20:12, "Joost van de Wijgerd" <jwijgerd@gmail.com>:
>>>  Howmuch memory do you have on the machine. Seems like you have 8G
>>>  reserved for the Cassandra java process, If this is all the memory on
>>>  the machine you might be swapping. Also which jvm do you use?
>>>
>>>  kind regards
>>>
>>>  Joost
>>>
>>>  On Mon, Jul 23, 2012 at 10:07 AM, Nikolay Kоvshov <nkovshov@yandex.ru>
wrote:
>>>>    21th I have mirgated to cassandra 1.1.2 but see no improvement
>>>>
>>>>   cat /var/log/cassandra/Earth1.log | grep "GC for"
>>>>   INFO [ScheduledTasks:1] 2012-05-22 17:42:48,445 GCInspector.java (line
123) GC for ParNew: 345 ms for 1 collections, 82451888 used; max is 8464105472
>>>>   INFO [ScheduledTasks:1] 2012-05-23 02:47:13,911 GCInspector.java (line
123) GC for ParNew: 312 ms for 1 collections, 110617416 used; max is 8464105472
>>>>   INFO [ScheduledTasks:1] 2012-05-23 11:57:54,317 GCInspector.java (line
123) GC for ParNew: 298 ms for 1 collections, 98161920 used; max is 8464105472
>>>>   INFO [ScheduledTasks:1] 2012-07-02 08:52:37,019 GCInspector.java (line
123) GC for ParNew: 196886 ms for 1 collections, 2310058496 used; max is 8464105472
>>>>   INFO [ScheduledTasks:1] 2012-07-16 17:41:25,940 GCInspector.java (line
123) GC for ParNew: 200146 ms for 1 collections, 2345987088 used; max is 8464105472
>>>>   === Migrated from 1.0.0 to 1.1.2
>>>>   INFO [ScheduledTasks:1] 2012-07-21 09:05:08,280 GCInspector.java (line
122) GC for ParNew: 282 ms for 1 collections, 466406864 used; max is 8464105472
>>>>   INFO [ScheduledTasks:1] 2012-07-21 12:38:43,132 GCInspector.java (line
122) GC for ParNew: 233 ms for 1 collections, 405269504 used; max is 8464105472
>>>>   INFO [ScheduledTasks:1] 2012-07-22 02:29:09,596 GCInspector.java (line
122) GC for ParNew: 253 ms for 1 collections, 389700768 used; max is 8464105472
>>>>   INFO [ScheduledTasks:1] 2012-07-22 17:45:46,357 GCInspector.java (line
122) GC for ParNew: 57391 ms for 1 collections, 400083984 used; max is 8464105472
>>>>
>>>>   Memory and yaml memory-related settings are default
>>>>   I do not do deletes
>>>>   I have 2 CF's and no secondary indexes
>>>>
>>>>   LiveRatio's:
>>>>    INFO [pool-1-thread-1] 2012-06-09 02:36:07,759 Memtable.java (line
177) CFS(Keyspace='Keyspace1', ColumnFamily='PSS') liveRatio is 1.0 (just-counted was 1.0).
 calculation took 85ms for 6236 columns
>>>>    INFO [MemoryMeter:1] 2012-07-21 09:04:47,614 Memtable.java (line 213)
CFS(Keyspace='Keyspace1', ColumnFamily='Standard1') liveRatio is 1.0 (just-counted was 1.0).
 calculation took 8ms for 1 columns
>>>>    INFO [MemoryMeter:1] 2012-07-21 09:04:51,012 Memtable.java (line 213)
CFS(Keyspace='Keyspace1', ColumnFamily='PSS') liveRatio is 1.0 (just-counted was 1.0).  calculation
took 99ms for 1094 columns
>>>>    INFO [MemoryMeter:1] 2012-07-21 09:04:51,331 Memtable.java (line 213)
CFS(Keyspace='Keyspace1', ColumnFamily='Standard1') liveRatio is 1.0 (just-counted was 1.0).
 calculation took 80ms for 242 columns
>>>>    INFO [MemoryMeter:1] 2012-07-21 09:04:51,856 Memtable.java (line 213)
CFS(Keyspace='Keyspace1', ColumnFamily='PSS') liveRatio is 1.0 (just-counted was 1.0).  calculation
took 505ms for 2678 columns
>>>>    INFO [MemoryMeter:1] 2012-07-21 09:04:52,881 Memtable.java (line 213)
CFS(Keyspace='Keyspace1', ColumnFamily='PSS') liveRatio is 1.0 (just-counted was 1.0).  calculation
took 776ms for 5236 columns
>>>>    INFO [MemoryMeter:1] 2012-07-21 09:04:52,945 Memtable.java (line 213)
CFS(Keyspace='Keyspace1', ColumnFamily='Standard1') liveRatio is 1.0 (just-counted was 1.0).
 calculation took 64ms for 389 columns
>>>>    INFO [MemoryMeter:1] 2012-07-21 09:04:55,162 Memtable.java (line 213)
CFS(Keyspace='Keyspace1', ColumnFamily='PSS') liveRatio is 1.0 (just-counted was 1.0).  calculation
took 1378ms for 8948 columns
>>>>    INFO [MemoryMeter:1] 2012-07-21 09:04:55,304 Memtable.java (line 213)
CFS(Keyspace='Keyspace1', ColumnFamily='Standard1') liveRatio is 1.0 (just-counted was 1.0).
 calculation took 140ms for 1082 columns
>>>>    INFO [MemoryMeter:1] 2012-07-21 09:05:08,439 Memtable.java (line 213)
CFS(Keyspace='Keyspace1', ColumnFamily='Standard1') liveRatio is 2.5763038186160894 (just-counted
was 2.5763038186160894).  calculation took 8796ms for 102193 columns
>>>>
>>>>   18.07.2012, 07:51, "aaron morton" <aaron@thelastpickle.com>:
>>>>>   Assuming all the memory and yaml settings default that does not sound
right. The first thought would be the memory meter not counting correctly...
>>>>>   Do you do a lot of deletes ?
>>>>>   Do you have a lot of CF's and/or secondary indexes ?
>>>>>   Can you see log lines about the "liveRatio" for your cf's ?
>>>>>   I would upgrade to 1.0.10 before getting too carried away though.
>>>>>   Cheers
>>>>>
>>>>>   -----------------
>>>>>   Aaron Morton
>>>>>   Freelance Developer
>>>>>   @aaronmorton
>>>>>   http://www.thelastpickle.com
>>>>>
>>>>>   On 17/07/2012, at 8:14 PM, Nikolay Kоvshov wrote:
>>>>>>   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
--------
>>>  --
>>>  Joost van de Wijgerd
>>>  Visseringstraat 21B
>>>  1051KH Amsterdam
>>>  +31624111401
>>>  joost.van.de.wijgerd@Skype
>>>  http://www.linkedin.com/in/jwijgerd
> --
> Joost van de Wijgerd
> Visseringstraat 21B
> 1051KH Amsterdam
> +31624111401
> joost.van.de.wijgerd@Skype
> http://www.linkedin.com/in/jwijgerd

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