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From Ted Yu <yuzhih...@gmail.com>
Subject Re: Bucket cache configuration
Date Fri, 29 Aug 2014 21:18:19 GMT
Please read Procedure 9.1 under
http://hbase.apache.org/book.html#offheap.blockcache

Cheers


On Fri, Aug 29, 2014 at 2:04 PM, gabriela montiel <
gabriela.montiel@oracle.com> wrote:

> Hello,
>
> We are working on performance tunning on HBase 0.98 CDH 5.1 using bucket
> cache. We were able to set up the bucket cache configuration on all storage
> nodes but we wanted to know further details on how the MaxDirectMemorySize
> is related to the bucket cache size and the Java heap size. How does the
> MaxDirectMemorySize affects performance in HBase?
>
> Our current configuration is the following:
>
> <property>
> <name>hbase.bucketcache.ioengine</name>
> <value>offheap</value>
> <source>hbase-site.xml</source>
> </property>
> <property>
> <name>hbase.bucketcache.percentage.in.combinedcache</name>
> <value>0.8</value>
> <source>hbase-site.xml</source>
> </property>
> <property>
> <name>hbase.bucketcache.size</name>
> <value>10000</value>
> <source>hbase-site.xml</source>
> </property>
>
> -XX:MaxDirectMemorySize=12g -XX:+UseParNewGC -XX:+UseConcMarkSweepGC
> -XX:-CMSConcurrentMTEnabled -XX:CMSInitiatingOccupancyFraction=70
> -XX:+CMSParallelRemarkEnabled
> Java Heap Size: 12G
>
>
> Thanks,
>
> Gaby
>

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