Another related question: is there a mean to change compressor (or
enable compressor) on an existing column family without breaking
existing data (e.g. from LZO to snappy) ?
Le 10/07/11 10:21, Weiwei Xiong a écrit :
Now I applied the major_compact on a table with BLOOMFILTER enabled. But how
can I make sure if the row-keys have really been added into the bloomfilter?
I profiled the cost of<HTable>.exists(<Get>) but it seems to me BF didn't
give me speedup comparing with the execution without BLOOMFILTER enabled.
Am I missing anything here?
Thanks
ww
On Sat, Jul 9, 2011 at 1:32 PM, Weiwei Xiong<[email protected]> wrote:
Thanks Andrew. I will give it a try.
ww
On Fri, Jul 8, 2011 at 6:45 PM, Andrew Purtell<[email protected]>wrote:
Sorry that is:
major_compact 'tablename'
Typing too fast...
Best regards,
- Andy
Problems worthy of attack prove their worth by hitting back. - Piet Hein
(via Tom White)
----- Original Message -----
From: Andrew Purtell<[email protected]>
To: "[email protected]"<[email protected]>
Cc:
Sent: Friday, July 8, 2011 6:42 PM
Subject: Re: Enable BLOOMFILTER on existing tables
You can update existing data through manually triggering compaction.
After you
make a change like this, go to the hbase shell and execute:
major_compaction 'yourtablename'
After major compaction all of the store files for the table will abide
the most
recent schema settings.
Best regards,
- Andy
Problems worthy of attack prove their worth by hitting back. - Piet Hein
(via
Tom White)
----- Original Message -----
From: Weiwei Xiong<[email protected]>
To: [email protected]
Cc:
Sent: Friday, July 8, 2011 6:02 PM
Subject: Enable BLOOMFILTER on existing tables
Hi all,
I want to enable the bloomfilter on some existing tables to speed-up
row-key
existence checking. I altered the BLOOMFILTER from "NONE" to
"ROW" for this
purpose.
But one think I am not clear is, will the setting change also take
effect
on
pre-existing rows? Or only rows to be inserted in future get the
BLOOMFILTER
property?
If bloomfilter change won't be applied to existing rows, is there any
other
way to speed up the row-key existence checking?
Thanks,
ww
