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From "meirav.malka" <meirav.ma...@gmail.com>
Subject Re: Can MOB be enabled for existing table?
Date Fri, 21 Sep 2018 06:14:03 GMT
Hi,Since you probably don't have enough space for backup for such a large table, test it on
a small one and rowcount before and after.We work extensively with mob and there are several
issues with it that we had to work around.1.Mob and ttl - region server crashes after ttl
archiver runs.2.Mob and snapshot - didn't work in cdh 5.7.13.Mob compaction- currently performed
only by the master.if your flushes aren't big enough , compaction will never end.4.Deletes
- major mob compaction is the only one doing mob delete,it is also done by the master, on
the entire data( it is not scheduled )If you have deletes, the will never actually be deleted.
Regards,Meirav
Sent from my Samsung Galaxy smartphone.
-------- Original message --------From: Jean-Marc Spaggiari <jean-marc@spaggiari.org>
Date: 9/21/18  01:09  (GMT+02:00) To: user <user@hbase.apache.org> Subject: Re: Can
MOB be enabled for existing table? 
Hi Andrea,

I will say that the easiest way to know is to try it... I'm guessing that
it should work. When HBase will compact the file, it will figure that some
fields are bigger than the configures MOB threshold and will move them
under the MOB umbrella. But this has to be tested. Let us know.

Thanks,

JMS

Le jeu. 20 sept. 2018 à 08:26, Andrea Fonti <andreafontict@gmail.com> a
écrit :

> Hi,
>
> I’m currently running HBASE on a Cloudera CDH 5.8.4 distribution
> (hbase-1.2.0+cdh5.8.5+263), is it possible to enable MOB for a column of an
> existing multi terabyte table?
>
> If the answer is affirmative what will hbase do with the existing data?
> Will it rewrite with MOB files the next major compaction?
>
> Thank you
>
> Andrea
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