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From ruslan usifov <ruslan.usi...@gmail.com>
Subject Re: row_cache_provider = 'SerializingCacheProvider'
Date Mon, 04 Jun 2012 21:01:03 GMT
I think that SerializingCacheProvider have more JAVA HEAP footprint,
then i think

2012/6/4 ruslan usifov <ruslan.usifov@gmail.com>:
> I have setup 5GB of JavaHeap wit follow tuning:
>
> MAX_HEAP_SIZE="5G"
> HEAP_NEWSIZE="800M"
>
> 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="$JVM_OPTS -XX:MaxTenuringThreshold=5"
> JVM_OPTS="$JVM_OPTS -XX:CMSInitiatingOccupancyFraction=65"
> JVM_OPTS="$JVM_OPTS -XX:+UseCMSInitiatingOccupancyOnly"
> JVM_OPTS="$JVM_OPTS -XX:CMSFullGCsBeforeCompaction=1"
>
> Also I set up 2GB to memtables (memtable_total_space_in_mb: 2048)
>
>
> My avg heap usage (nodetool -h localhost info):
>
> 3G
>
>
> Based on "nodetool -h localhost cfhistograms" i calc avg row size
>
> 70KB
>
> I setup row cache only for one CF with follow settings:
>
> update column family building with rows_cached=10000 and
> row_cache_provider='SerializingCacheProvider';
>
>
> When i setup row cache i got promotion failure in GC (with stop the
> world pause about 30secs) with almost HEAP filled. I very confused
> with this behavior.
>
>
> PS: i use cassandra 1.0.10, with JNA 3.4.0 on ubuntu lucid (kernel 2.6.32-41)
>
>
> 2012/6/4 aaron morton <aaron@thelastpickle.com>:
>> Yes SerializingCacheProvider is the off heap caching provider.
>>
>> Can you do some more digging into what is using the heap ?
>>
>> Cheers
>> A
>>
>> -----------------
>> Aaron Morton
>> Freelance Developer
>> @aaronmorton
>> http://www.thelastpickle.com
>>
>> On 1/06/2012, at 9:52 PM, ruslan usifov wrote:
>>
>> Hello
>>
>> I begin use SerializingCacheProvider for rows cashing, and got
>> extremely JAVA heap grows. But i think that this cache provider
>> doesn't use JAVA heap
>>
>>

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