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HBase, mail # user - heap memory running


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Re: heap memory running
Jean-Marc Spaggiari 2013-06-22, 02:06
Also, if you assign "only" 24GB for the heap, the OS will still use
some of the remaining memory as cache. And you will need some memory
for the hadoop process too.

JM

2013/6/21 Jean-Daniel Cryans <[EMAIL PROTECTED]>:
> 24GB is often cited as an upper limit, but YMMV.
>
> It also depends if you need memory for MapReduce, if you are using it.
>
> J-D
>
> On Wed, Jun 19, 2013 at 3:17 PM, prakash kadel <[EMAIL PROTECTED]> wrote:
>> hi every one,
>>
>> i am quite new to base and java. I have a few questions.
>>
>> 1. on the web ui for hbase i have the following entry in the region server
>>
>> mining,60020,13711358624Fri Jun 14 00:04:22 GMT 2013requestsPerSecond=0,
>> numberOfOnlineRegions=106, usedHeapMB=5577, maxHeapMB=7933
>> when the hbase is idle with no requests the usedHeapMB hovers around
>> 5000MB, shouldn't it go down after some idle time? what is occupying the
>> heap when no requests are being made?
>>
>> 2. I have assigned 8GB for heap on a 48GB machine, i dont mind assigning
>> more of it to hbase.
>>     What is the recommended size for the heap?
>>
>> Sincerely,
>> Prakash