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From Praveen Bysani <praveen.ii...@gmail.com>
Subject Re: Block size of HBase files
Date Mon, 13 May 2013 12:19:51 GMT
We insert data using java hbase client (org.apache.hadoop.hbase.client.*) .
However we are not providing any details in the configuration object ,
except for the zookeeper quorum, port number. Should we specify explicitly
at this stage ?

On 13 May 2013 19:54, Anoop John <anoop.hbase@gmail.com> wrote:

> >now have 731 regions (each about ~350 mb !!). I checked the
> configuration in CM, and the value for hbase.hregion.max.filesize  is 1 GB
> too !!!
>
> You mentioned the splits at the time of table creation?  How u created the
> table?
>
> -Anoop-
>
> On Mon, May 13, 2013 at 5:18 PM, Praveen Bysani <praveen.iiith@gmail.com
> >wrote:
>
> > Hi,
> >
> > Thanks for the details. No i haven't run any compaction or i have no idea
> > if there is one going on in background. I executed a major_compact on
> that
> > table  and i now have 731 regions (each about ~350 mb !!). I checked the
> > configuration in CM, and the value for hbase.hregion.max.filesize  is 1
> GB
> > too !!!
> >
> > I am not trying to access HFiles in my MR job, infact i am just using a
> PIG
> > script which handles this. This number (731) is close to my number of map
> > tasks, which makes sense. But how can i decrease this, shouldn't the size
> > of each region be 1 GB with that configuration value ?
> >
> >
> > On 13 May 2013 18:36, Ted Yu <yuzhihong@gmail.com> wrote:
> >
> > > You can change HFile size through hbase.hregion.max.filesize parameter.
> > >
> > > On May 13, 2013, at 2:45 AM, Praveen Bysani <praveen.iiith@gmail.com>
> > > wrote:
> > >
> > > > Hi,
> > > >
> > > > I wanted to minimize on the number of map reduce tasks generated
> while
> > > > processing a job, hence configured it to a larger value.
> > > >
> > > > I don't think i have configured HFile size in the cluster. I use
> > Cloudera
> > > > Manager to mange my cluster, and the only configuration i can relate
> > > > to is hfile.block.cache.size
> > > > which is set to 0.25. How do i change the HFile size ?
> > > >
> > > > On 13 May 2013 15:03, Amandeep Khurana <amansk@gmail.com> wrote:
> > > >
> > > >> On Sun, May 12, 2013 at 11:40 PM, Praveen Bysani <
> > > praveen.iiith@gmail.com
> > > >>> wrote:
> > > >>
> > > >>> Hi,
> > > >>>
> > > >>> I have the dfs.block.size value set to 1 GB in my cluster
> > > configuration.
> > > >>
> > > >>
> > > >> Just out of curiosity - why do you have it set at 1GB?
> > > >>
> > > >>
> > > >>> I
> > > >>> have around 250 GB of data stored in hbase over this cluster.
But
> > when
> > > i
> > > >>> check the number of blocks, it doesn't correspond to the block
size
> > > >> value i
> > > >>> set. From what i understand i should only have ~250 blocks. But
> > instead
> > > >>> when i did a fsck on the /hbase/<table-name>, i got the
following
> > > >>>
> > > >>> Status: HEALTHY
> > > >>> Total size:    265727504820 B
> > > >>> Total dirs:    1682
> > > >>> Total files:   1459
> > > >>> Total blocks (validated):      1459 (avg. block size 182129886
B)
> > > >>> Minimally replicated blocks:   1459 (100.0 %)
> > > >>> Over-replicated blocks:        0 (0.0 %)
> > > >>> Under-replicated blocks:       0 (0.0 %)
> > > >>> Mis-replicated blocks:         0 (0.0 %)
> > > >>> Default replication factor:    3
> > > >>> Average block replication:     3.0
> > > >>> Corrupt blocks:                0
> > > >>> Missing replicas:              0 (0.0 %)
> > > >>> Number of data-nodes:          5
> > > >>> Number of racks:               1
> > > >>>
> > > >>> Are there any other configuration parameters that need to be set
?
> > > >>
> > > >>
> > > >> What is your HFile size set to? The HFiles that get persisted would
> be
> > > >> bound by that number. Thereafter each HFile would be split into
> > blocks,
> > > the
> > > >> size of which you configure using the dfs.block.size configuration
> > > >> parameter.
> > > >>
> > > >>
> > > >>>
> > > >>> --
> > > >>> Regards,
> > > >>> Praveen Bysani
> > > >>> http://www.praveenbysani.com
> > > >
> > > >
> > > >
> > > > --
> > > > Regards,
> > > > Praveen Bysani
> > > > http://www.praveenbysani.com
> > >
> >
> >
> >
> > --
> > Regards,
> > Praveen Bysani
> > http://www.praveenbysani.com
> >
>



-- 
Regards,
Praveen Bysani
http://www.praveenbysani.com

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