HBase major_,compaction

[Miguel Costa <mi...@telecom.pt>]

H

I created a table with a small maxfilesize (64MB)and now the table has got lots of regions, more than 1000.

I changed the maxfilesize to a bigger number  (512MB) but I still have lots of regions even after I major_compact all tables. I t seems that major_compact didn'tcompact any region.



What can I do to compact the regions and have fewer regions, and how can I check if the table is already compacted?



I'm using Hbase 0.90.2.



Thanks,



Miguel

Re: HBase major_,compaction

[Stack <st...@duboce.net>]

Major compaction will not merge old small regions.  The change in
cable schema makes it so existing ones will grow larger before they in
turn split.  To check a table is already compacted, do an lsr on the
table's directory in hdfs.   See how many storefiles.  If a major
compaction ran recently, there should be one file only in most leaf
directories.

St.Ack

On Wed, May 25, 2011 at 1:13 PM, Miguel Costa <mi...@telecom.pt> wrote:
> H
>
> I created a table with a small maxfilesize (64MB)and now the table has got lots of regions, more than 1000.
>
> I changed the maxfilesize to a bigger number  (512MB) but I still have lots of regions even after I major_compact all tables. I t seems that major_compact didn'tcompact any region.
>
>
>
> What can I do to compact the regions and have fewer regions, and how can I check if the table is already compacted?
>
>
>
> I'm using Hbase 0.90.2.
>
>
>
> Thanks,
>
>
>
> Miguel
>
>
>
>