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From aaron morton <aa...@thelastpickle.com>
Subject Re: "Heap is N.N full." Immediately on startup
Date Thu, 21 Feb 2013 16:58:48 GMT
My first guess would be the bloom filter and index sampling from lots-o-rows 

Check the row count in cfstats
Check the bloom filter size in cfstats. 

Background on memory requirements http://www.mail-archive.com/user@cassandra.apache.org/msg25762.html

Cheers

-----------------
Aaron Morton
Freelance Cassandra Developer
New Zealand

@aaronmorton
http://www.thelastpickle.com

On 20/02/2013, at 11:27 PM, Andras Szerdahelyi <andras.szerdahelyi@ignitionone.com>
wrote:

> Hey list,
> 
> Any ideas ( before I take a heap dump ) what might be consuming my 8GB JVM heap at startup
in Cassandra 1.1.6 besides
> row cache : not persisted and is at 0 keys when this warning is produced
> Memtables : no write traffic at startup, my app's column families are durable_writes:false
> Pending tasks : no pending tasks, except for 928 compactions ( not sure where those are
coming from )
> I drew these conclusions from the StatusLogger output below: 
> 
> INFO [ScheduledTasks:1] 2013-02-20 05:13:25,198 GCInspector.java (line 122) GC for ConcurrentMarkSweep:
14959 ms for 2 collections, 7017934560 used; max is 8375238656
>  INFO [ScheduledTasks:1] 2013-02-20 05:13:25,198 StatusLogger.java (line 57) Pool Name
                   Active   Pending   Blocked
>  INFO [ScheduledTasks:1] 2013-02-20 05:13:25,199 StatusLogger.java (line 72) ReadStage
                        0         0         0
>  INFO [ScheduledTasks:1] 2013-02-20 05:13:25,200 StatusLogger.java (line 72) RequestResponseStage
             0         0         0
>  INFO [ScheduledTasks:1] 2013-02-20 05:13:25,200 StatusLogger.java (line 72) ReadRepairStage
                  0         0         0
>  INFO [ScheduledTasks:1] 2013-02-20 05:13:25,200 StatusLogger.java (line 72) MutationStage
                    0        -1         0
>  INFO [ScheduledTasks:1] 2013-02-20 05:13:25,201 StatusLogger.java (line 72) ReplicateOnWriteStage
            0         0         0
>  INFO [ScheduledTasks:1] 2013-02-20 05:13:25,201 StatusLogger.java (line 72) GossipStage
                      0         0         0
>  INFO [ScheduledTasks:1] 2013-02-20 05:13:25,201 StatusLogger.java (line 72) AntiEntropyStage
                 0         0         0
>  INFO [ScheduledTasks:1] 2013-02-20 05:13:25,201 StatusLogger.java (line 72) MigrationStage
                   0         0         0
>  INFO [ScheduledTasks:1] 2013-02-20 05:13:25,201 StatusLogger.java (line 72) StreamStage
                      0         0         0
>  INFO [ScheduledTasks:1] 2013-02-20 05:13:25,202 StatusLogger.java (line 72) MemtablePostFlusher
              0         0         0
>  INFO [ScheduledTasks:1] 2013-02-20 05:13:25,202 StatusLogger.java (line 72) FlushWriter
                      0         0         0
>  INFO [ScheduledTasks:1] 2013-02-20 05:13:25,202 StatusLogger.java (line 72) MiscStage
                        0         0         0
>  INFO [ScheduledTasks:1] 2013-02-20 05:13:25,202 StatusLogger.java (line 72) commitlog_archiver
               0         0         0
>  INFO [ScheduledTasks:1] 2013-02-20 05:13:25,203 StatusLogger.java (line 72) InternalResponseStage
            0         0         0
>  INFO [ScheduledTasks:1] 2013-02-20 05:13:25,212 StatusLogger.java (line 77) CompactionManager
                0       928
>  INFO [ScheduledTasks:1] 2013-02-20 05:13:25,212 StatusLogger.java (line 89) MessagingService
               n/a       0,0
>  INFO [ScheduledTasks:1] 2013-02-20 05:13:25,212 StatusLogger.java (line 99) Cache Type
                    Size                 Capacity               KeysToSave               
                                         Provider
>  INFO [ScheduledTasks:1] 2013-02-20 05:13:25,212 StatusLogger.java (line 100) KeyCache
                        25                       25                      all             
                                                   
>  INFO [ScheduledTasks:1] 2013-02-20 05:13:25,213 StatusLogger.java (line 106) RowCache
                         0                        0                      all             
org.apache.cassandra.cache.SerializingCacheProvider
>  INFO [ScheduledTasks:1] 2013-02-20 05:13:25,213 StatusLogger.java (line 113) ColumnFamily
               Memtable ops,data
>  INFO [ScheduledTasks:1] 2013-02-20 05:13:25,213 StatusLogger.java (line 116) MYAPP_1.CF
                       0,0
>  INFO [ScheduledTasks:1] 2013-02-20 05:13:25,213 StatusLogger.java (line 116) MYAPP_2.CF
                        0,0
>  INFO [ScheduledTasks:1] 2013-02-20 05:13:25,213 StatusLogger.java (line 116) HiveMetaStore.MetaStore
                  0,0
>  INFO [ScheduledTasks:1] 2013-02-20 05:13:25,213 StatusLogger.java (line 116) system.NodeIdInfo
                        0,0
>  INFO [ScheduledTasks:1] 2013-02-20 05:13:25,213 StatusLogger.java (line 116) system.IndexInfo
                         0,0
>  INFO [ScheduledTasks:1] 2013-02-20 05:13:25,213 StatusLogger.java (line 116) system.LocationInfo
                      0,0
>  INFO [ScheduledTasks:1] 2013-02-20 05:13:25,214 StatusLogger.java (line 116) system.Versions
                          0,0
>  INFO [ScheduledTasks:1] 2013-02-20 05:13:25,214 StatusLogger.java (line 116) system.schema_keyspaces
                  0,0
>  INFO [ScheduledTasks:1] 2013-02-20 05:13:25,214 StatusLogger.java (line 116) system.Migrations
                        0,0
>  INFO [ScheduledTasks:1] 2013-02-20 05:13:25,214 StatusLogger.java (line 116) system.schema_columnfamilies
                0,0
>  INFO [ScheduledTasks:1] 2013-02-20 05:13:25,214 StatusLogger.java (line 116) system.schema_columns
                    0,0
>  INFO [ScheduledTasks:1] 2013-02-20 05:13:25,214 StatusLogger.java (line 116) system.HintsColumnFamily
                 0,0
>  INFO [ScheduledTasks:1] 2013-02-20 05:13:25,214 StatusLogger.java (line 116) system.Schema
                            0,0
>  INFO [ScheduledTasks:1] 2013-02-20 05:13:25,214 StatusLogger.java (line 116) cfs_archive.sblocks
                      0,0
>  INFO [ScheduledTasks:1] 2013-02-20 05:13:25,214 StatusLogger.java (line 116) cfs_archive.cleanup
                      0,0
>  INFO [ScheduledTasks:1] 2013-02-20 05:13:25,215 StatusLogger.java (line 116) cfs_archive.inode
                        0,0
>  INFO [ScheduledTasks:1] 2013-02-20 05:13:25,215 StatusLogger.java (line 116) cfs.cleanup
                              0,0
>  INFO [ScheduledTasks:1] 2013-02-20 05:13:25,215 StatusLogger.java (line 116) cfs.sblocks
                              0,0
>  INFO [ScheduledTasks:1] 2013-02-20 05:13:25,215 StatusLogger.java (line 116) cfs.inode
                                0,0
>  INFO [ScheduledTasks:1] 2013-02-20 05:13:25,215 StatusLogger.java (line 116) OpsCenter.events
                         0,0
>  INFO [ScheduledTasks:1] 2013-02-20 05:13:25,215 StatusLogger.java (line 116) OpsCenter.rollups300
                     0,0
>  INFO [ScheduledTasks:1] 2013-02-20 05:13:25,215 StatusLogger.java (line 116) OpsCenter.rollups86400
                   0,0
>  INFO [ScheduledTasks:1] 2013-02-20 05:13:25,215 StatusLogger.java (line 116) OpsCenter.pdps
                     345,54448
>  INFO [ScheduledTasks:1] 2013-02-20 05:13:25,215 StatusLogger.java (line 116) OpsCenter.events_timeline
                0,0
>  INFO [ScheduledTasks:1] 2013-02-20 05:13:25,216 StatusLogger.java (line 116) OpsCenter.settings
                       0,0
>  INFO [ScheduledTasks:1] 2013-02-20 05:13:25,216 StatusLogger.java (line 116) OpsCenter.rollups7200
                    0,0
>  INFO [ScheduledTasks:1] 2013-02-20 05:13:25,216 StatusLogger.java (line 116) OpsCenter.rollups60
                      0,0
>  INFO [ScheduledTasks:1] 2013-02-20 05:13:25,216 StatusLogger.java (line 116) demo.users
                               0,0
>  INFO [ScheduledTasks:1] 2013-02-20 05:13:25,216 StatusLogger.java (line 116) MYAPP_3.CF
                        0,0
>  WARN [ScheduledTasks:1] 2013-02-20 05:13:25,216 GCInspector.java (line 145) Heap is
0.8379384574280004 full.  You may need to reduce memtable and/or cache sizes.  Cassandra will
now flush up to the two largest memtables to free up memory.  Adjust flush_largest_memtables_at
threshold in cassandra.yaml if you don't want Cassandra to do this automatically
>  WARN [ScheduledTasks:1] 2013-02-20 05:13:25,217 StorageService.java (line 2855) Flushing
CFS(Keyspace='OpsCenter', ColumnFamily='pdps') to relieve memory pressure
>  INFO [ScheduledTasks:1] 2013-02-20 05:13:25,217 ColumnFamilyStore.java (line 659) Enqueuing
flush of Memtable-pdps@98567689(15238/54448 serialized/live bytes, 345 ops)
>  INFO [FlushWriter:6] 2013-02-20 05:13:25,218 Memtable.java (line 264) Writing Memtable-pdps@98567689(15238/54448
serialized/live bytes, 345 ops)
>  INFO [FlushWriter:6] 2013-02-20 05:13:25,241 Memtable.java (line 305) Completed flushing
/var/lib/cassandra/data/OpsCenter/pdps/OpsCenter-pdps-hf-127-Data.db (5394 bytes) for commitlog
position ReplayPosition(segmentId=1361354508149, :
> 
> 
> 
> Thanks!
> Andras
> 


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