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From Ted Yu <yuzhih...@gmail.com>
Subject Re: Can MOB be enabled for existing table?
Date Fri, 21 Sep 2018 15:23:52 GMT
bq. region server crashes after ttl archiver runs

This is the first time I hear of such problem. Can you give us more
information (stack trace, server log snippet for that period) ?

Thanks

On Thu, Sep 20, 2018 at 11:14 PM meirav.malka <meirav.malka@gmail.com>
wrote:

> 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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