Re: Can I use coprocessor to record the deleted data caused by ttl?

[lars hofhansl <lh...@yahoo.com>]

Yes (in 0.94.2+). But it would be quite tricky.
You'd have to hook into the compaction. There's a new hook now in RegionObserver (preCompactionScannerOpen, and preFlushScannerOpen).
See HBASE-6427.

These two hooks are passed the scanners that provide the set of KVs to be compacted. You could wrap that scanner in your own.
The details will be tricky, though.

What is your usecase for this?

-- Lars



________________________________
 From: yonghu <yo...@gmail.com>
To: user@hbase.apache.org 
Sent: Friday, August 31, 2012 1:13 PM
Subject: Can I use coprocessor to record the deleted data caused by ttl?
 
Dear All,

I wonder if I can use coprocessor to record the deleted data caused by
ttl. Any ideas?

regards!

Yong

Re: Can I use coprocessor to record the deleted data caused by ttl?

[yonghu <yo...@gmail.com>]

I want to record the data change from the source table. Thanks for your apply.

regards!

Yong

On Sat, Sep 1, 2012 at 1:01 AM, lars hofhansl <lh...@yahoo.com> wrote:
> Yes (in 0.94.2+). But it would be quite tricky.
> You'd have to hook into the compaction. There's a new hook now in RegionObserver (preCompactionScannerOpen, and preFlushScannerOpen).
> See HBASE-6427.
>
> These two hooks are passed the scanners that provide the set of KVs to be compacted. You could wrap that scanner in your own.
> The details will be tricky, though.
>
> What is your usecase for this?
>
> -- Lars
>
>
>
> ________________________________
>  From: yonghu <yo...@gmail.com>
> To: user@hbase.apache.org
> Sent: Friday, August 31, 2012 1:13 PM
> Subject: Can I use coprocessor to record the deleted data caused by ttl?
>
> Dear All,
>
> I wonder if I can use coprocessor to record the deleted data caused by
> ttl. Any ideas?
>
> regards!
>
> Yong