Home | About | Sematext search-lucene.com search-hadoop.com
NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB
 Search Hadoop and all its subprojects:

Switch to Threaded View
HBase >> mail # dev >> [DISCUSS] More new feature backports to 0.94.


Copy link to this message
-
Re: [DISCUSS] More new feature backports to 0.94.
I think we are basically agreeing -- my primary concern is bringing new
features in vital paths introduces more risk, I'd rather not backport major
new features unless we achieve a higher level of assurance through system
and basic fault injection testing.

For the three current examples -- snapshots, zk table locks, online merge
-- I actually would prefer not including any in apache 0.94.  Of the bunch,
I feel the table locks are the most risky since it affects vital paths a
user must use,  where as snapshots and online merge are features that a
user could choose to use but does not necessarily have to use.  I'll voice
my concerns, reason for concerns, and justifications on the individual
jiras.

I do feel that new features being in a dev/preview release like 0.95 aligns
well and doesn't create situations where different versions have different
feature sets.  New features should be introduced and hardened in a
dev/preview version, and the turn into the production ready versions after
they've been proven out a bit.

Jon.

On Fri, Mar 1, 2013 at 11:00 AM, lars hofhansl <[EMAIL PROTECTED]> wrote:

> This is an open source project, as long as there is a volunteer to
> backport a patch I see no problem with doing this.
> The only thing we as the community should ensure is that it must be
> demonstrated that the patch does not destabilize the 0.94 code base; that
> has to be done on a case by case basis.
>
>
> Also, there is no stable release of HBase other than 0.94 (0.95 is not
> stable, and we specifically state that it should not be used in production).
>
> -- Lars
>
>
>
> ________________________________
>  From: Jonathan Hsieh <[EMAIL PROTECTED]>
> To: [EMAIL PROTECTED]
> Sent: Friday, March 1, 2013 8:31 AM
> Subject: [DISCUSS] More new feature backports to 0.94.
>
> I was thinking more about HBASE-7360 (backport snapshots to 0.94) and also
> saw HBASE-7965 which suggests porting some major-ish features (table locks,
> online merge) in to the apache 0.94 line.   We should chat about what we
> want to do about new features and bringing them into stable versions (0.94
> today) and in general criteria we use for future versions.
>
> This is similar to the snapshots backport discussion and earlier backport
> discussions.  Here's my understanding of  high level points we basically
> agree upon.
> * Backporting new features to the previous major version incurs more cost
> when developing new features,  pushes back efforts on making the trunk
> versions and reduces incentive to move to newer versions.
> * Backporting new features to earlier versions (0.9x.0, 0.9x.1) is
> reasonable since they are generally less stable.
> * Backporting new features to later version (0.9x.5, 0.9x.6) is less
> reasonable --  (ex: a 0.94.6, or 0.94.7 should only include robust
> features).
> * Backporting orthogonal features (snapshots) seems less risky than core
> changing features
> * An except: If multiple distributions declare intent to backport, it makes
> sense to backport a feature. (snapshots for example).
>
> Some new circumstances and discussion topics:
> * We now have a dev branch (0.95) with looser compat requirements that we
> could more readily release with dev/preview versions.  Shouldn't this
> reduce the need to backport features to the apache stable branches?  Would
> releases of these releases "replace" the 0.x.0 or 0.x.1 releases?
> * For major features in later versions we should raise the bar on the
> amount of testing probably be more explicit about what testing is done
> (unit tests not suffcient, system testing stories/resports a requirement).
> Any other suggestions?
>
> Jon.
>
> --
> // Jonathan Hsieh (shay)
> // Software Engineer, Cloudera
> // [EMAIL PROTECTED]
>

--
// Jonathan Hsieh (shay)
// Software Engineer, Cloudera
// [EMAIL PROTECTED]
NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB