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From: Arul Ramachandran <arkuppai@gmail.com>
Date: Tue, 12 Sep 2017 09:52:51 -0700
Message-ID: <CAFoWv_dAih8xNU3EVhZNGqZUUbkE3wdPHJGBp4vgQhe4ri-HQw@mail.gmail.com>
Subject: Re: Offheap config question for Hbase 1.1.2
To: user@hbase.apache.org
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archived-at: Tue, 12 Sep 2017 16:52:59 -0000

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Thank you, Ram.

>> So are you trying to use bucket cache feature in offheap mode with 1.1.2?

Yes.

>> So even in 0.98 you were using bucket cache in offheap mode?

Yes, but it is a different hbase cluster and it run 0.98. The one I am
trying to setup offheap cache is hbase 1.1.2


-arul


On Tue, Sep 12, 2017 at 9:34 AM, ramkrishna vasudevan <
ramkrishna.s.vasudevan@gmail.com> wrote:

> Hi
>
> So are you trying to use bucket cache feature in offheap mode with 1.1.2?
> If so then it is needed that the MaxDirectMemory is greater than the
> offheap bucket cache size.
>
> If you are not using in offheap mode then probably there is no need for
> MaxDirectMemory to be greater than bucket cache size.
>
> >>in Hbase 0.98, I had to set -XX:MaxDirectMemorySize less than
> hbase.bucket.cache.size
> So even in 0.98 you were using bucket cache in offheap mode?
>
> Regards
> Ram
>
> On Tue, Sep 12, 2017 at 9:40 PM, Ted Yu <yuzhihong@gmail.com> wrote:
>
> > Looks like the config you meant should be hbase.bucketcache.size
> >
> > As the refguide says:
> >
> > A float that EITHER represents a percentage of total heap memory size to
> > give to the cache (if < 1.0) OR, it is the total capacity in megabytes of
> > BucketCache. Default: 0.0
> >
> > If you specify the size as capacity, -XX:MaxDirectMemorySize should be
> > bigger than the capacity.
> >
> > For #2, did you encounter some error ?
> >
> > Cheers
> >
> > On Tue, Sep 12, 2017 at 8:52 AM, Arul Ramachandran <arkuppai@gmail.com>
> > wrote:
> >
> > > In HBase 1.1.2, I am setting up bucket cache. I set MaxDirectMemory
> size
> > > greater than hbase.bucket.cache.size  - only then it would work.
> > >
> > > 1) Does HBASE_REGIONSERVER_OPTS -XX:MaxDirectMemorySize needs to be
> > greater
> > > than hbase.bucket.cache.size?
> > > 2) It seems with hbase 1.1.2, HBASE_MASTER_OPTS also needs the
> > >  -XX:MaxDirectMemorySize setting?
> > >
> > > IIRC, in Hbase 0.98, I had to set -XX:MaxDirectMemorySize less than
> > > hbase.bucket.cache.size --and-- I did not have to set
> > >  -XX:MaxDirectMemorySize for HBASE_MASTER_OPTS.
> > >
> > >
> > > Thanks,
> > > Arul
> > >
> >
>

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