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From Mark Greene <green...@gmail.com>
Subject Re: Cassandra tuning for running test on a desktop
Date Wed, 21 Apr 2010 12:14:17 GMT
Trying increasing Xmx. 1G is probably not enough for the amount of inserts
you are doing.

On Wed, Apr 21, 2010 at 8:10 AM, Nicolas Labrot <nithril@gmail.com> wrote:

> Hello,
>
> For my first message I will first thanks Cassandra contributors for their
> great works.
>
> I have a parameter issue with Cassandra (I hope it's just a parameter
> issue). I'm using Cassandra 6.0.1 with Hector client on my desktop. It's a
> simple dual core with 4GB of RAM on WinXP. I have keep the default JVM
> option inside cassandra.bat (Xmx1G)
>
> I'm trying to insert 3 millions of SC with 6 Columns each inside 1 CF
> (named Super1). The insertion go to 1 millions of SC (without slowdown) and
> Cassandra crash because of an OOM. (I store an average of 100 bytes per SC
> with a max of 10kB).
> I have aggressively decreased all the memories parameters without any
> respect to the consistency (My config is here [1]), the cache is turn off
> but Cassandra still go to OOM. I have joined the last line of the Cassandra
> life [2].
>
> What can I do to fix my issue ?  Is there another solution than increasing
> the Xmx ?
>
> Thanks for your help,
>
> Nicolas
>
>
>
>
>
> [1]
>   <Keyspaces>
>     <Keyspace Name="Keyspace1">
>       <ColumnFamily Name="Super1"
>                     ColumnType="Super"
>                     CompareWith="BytesType"
>                     CompareSubcolumnsWith="BytesType" />
>
> <ReplicaPlacementStrategy>org.apache.cassandra.locator.RackUnawareStrategy</ReplicaPlacementStrategy>
>       <ReplicationFactor>1</ReplicationFactor>
>
> <EndPointSnitch>org.apache.cassandra.locator.EndPointSnitch</EndPointSnitch>
>     </Keyspace>
>   </Keyspaces>
>   <CommitLogRotationThresholdInMB>32</CommitLogRotationThresholdInMB>
>
>   <DiskAccessMode>auto</DiskAccessMode>
>   <RowWarningThresholdInMB>64</RowWarningThresholdInMB>
>   <SlicedBufferSizeInKB>64</SlicedBufferSizeInKB>
>   <FlushDataBufferSizeInMB>16</FlushDataBufferSizeInMB>
>   <FlushIndexBufferSizeInMB>4</FlushIndexBufferSizeInMB>
>   <ColumnIndexSizeInKB>64</ColumnIndexSizeInKB>
>
>   <MemtableThroughputInMB>16</MemtableThroughputInMB>
>   <BinaryMemtableThroughputInMB>32</BinaryMemtableThroughputInMB>
>   <MemtableOperationsInMillions>0.01</MemtableOperationsInMillions>
>   <MemtableObjectCountInMillions>0.01</MemtableObjectCountInMillions>
>   <MemtableFlushAfterMinutes>60</MemtableFlushAfterMinutes>
>   <ConcurrentReads>4</ConcurrentReads>
>   <ConcurrentWrites>8</ConcurrentWrites>
> </Storage>
>
>
> [2]
>  INFO 13:36:41,062 Super1 has reached its threshold; switching in a fresh
> Memtable at
> CommitLogContext(file='d:/cassandra/commitlog\CommitLog-1271849783703.log',
> position=5417524)
>  INFO 13:36:41,062 Enqueuing flush of Memtable(Super1)@15385755
>  INFO 13:36:41,062 Writing Memtable(Super1)@15385755
>  INFO 13:36:42,062 Completed flushing
> d:\cassandra\data\Keyspace1\Super1-711-Data.db
>  INFO 13:36:45,781 Super1 has reached its threshold; switching in a fresh
> Memtable at
> CommitLogContext(file='d:/cassandra/commitlog\CommitLog-1271849783703.log',
> position=6065637)
>  INFO 13:36:45,781 Enqueuing flush of Memtable(Super1)@15578910
>  INFO 13:36:45,796 Writing Memtable(Super1)@15578910
>  INFO 13:36:46,109 Completed flushing
> d:\cassandra\data\Keyspace1\Super1-712-Data.db
>  INFO 13:36:54,296 GC for ConcurrentMarkSweep: 7149 ms, 58337240 reclaimed
> leaving 922392600 used; max is 1174208512
>  INFO 13:36:54,593 Super1 has reached its threshold; switching in a fresh
> Memtable at
> CommitLogContext(file='d:/cassandra/commitlog\CommitLog-1271849783703.log',
> position=6722241)
>  INFO 13:36:54,593 Enqueuing flush of Memtable(Super1)@24468872
>  INFO 13:36:54,593 Writing Memtable(Super1)@24468872
>  INFO 13:36:55,421 Completed flushing
> d:\cassandra\data\Keyspace1\Super1-713-Data.dbjava.lang.OutOfMemoryError:
> Java heap space
>  INFO 13:37:08,281 GC for ConcurrentMarkSweep: 5561 ms, 9432 reclaimed
> leaving 971904520 used; max is 1174208512
>
>

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