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From ruslan usifov <ruslan.usi...@gmail.com>
Subject Re: row_cache_provider = 'SerializingCacheProvider'
Date Mon, 04 Jun 2012 10:13:39 GMT
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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