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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 14:39:37 GMT
RAM doesn't necessarily need to be proportional but I would say the number
of nodes does. You can't just throw a bazillion inserts at one node. This is
the main benefit of Cassandra is that if you start hitting your capacity,
you add more machines and distribute the keys across more machines.

On Wed, Apr 21, 2010 at 9:07 AM, Nicolas Labrot <nithril@gmail.com> wrote:

> So does it means the RAM needed is proportionnal with the data handled ?
>
> Or Cassandra need a minimum amount or RAM when dataset is big?
>
> I must confess this OOM behaviour is strange.
>
>
> On Wed, Apr 21, 2010 at 2:54 PM, Mark Jones <MJones@imagehawk.com> wrote:
>
>>  On my 4GB machine I’m giving it 3GB and having no trouble with 60+
>> million 500 byte columns
>>
>>
>>
>> *From:* Nicolas Labrot [mailto:nithril@gmail.com]
>> *Sent:* Wednesday, April 21, 2010 7:47 AM
>> *To:* user@cassandra.apache.org
>> *Subject:* Re: Cassandra tuning for running test on a desktop
>>
>>
>>
>> I have try 1400M, and Cassandra OOM too.
>>
>> Is there another solution ? My data isn't very big.
>>
>> It seems that is the merge of the db
>>
>>  On Wed, Apr 21, 2010 at 2:14 PM, Mark Greene <greenemj@gmail.com> wrote:
>>
>> 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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