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 Plain View
HBase >> mail # dev >> Hbase Assignments in trunk.


+
Jonathan Hsieh 2012-09-05, 19:38
+
Stack 2012-09-05, 23:08
+
Jonathan Hsieh 2012-09-06, 00:07
+
Jonathan Hsieh 2012-09-06, 00:17
+
Stack 2012-09-06, 05:49
+
n keywal 2012-09-06, 07:53
+
lars hofhansl 2012-09-10, 22:29
+
Enis Söztutar 2012-09-11, 02:45
+
n keywal 2012-09-11, 07:52
Copy link to this message
-
Re: Hbase Assignments in trunk.
IMO, moving to new ZK seems to  makes sense for HBase trunk.

Jon.

On Thu, Sep 6, 2012 at 12:53 AM, n keywal <[EMAIL PROTECTED]> wrote:

> On the Async vs. sync: there are 3 different ways to write multiple znodes
> in ZK, and huge differences in the performances between them:
>
> 1) for loop sync
> 2) for loop async
> 3) multi
>
> Async will be 20 to 100 times faster than sync. multi will be 2 to 4 times
> faster than async (that is, 80 to 400 times faster than sync).
>
> Multi was not available before ZK 3.4. It has several obvious advantages
> over async imho: it's faster, it's synchronous and it's a transaction. That
> simplifies the user code usually.
>
> It has other advantages:
>  - async and sync will typically send 1 or more packet per znode (naggle is
> not activated iirc), while there will be only a few packets for all the
> znodes with multi
>  - you can expect async to write multiple times on the disk, while multi
> should write only once. This is usually better for i/o performances.
>
> On a serious recovery situation, with all the regions moving all other the
> place, saving disk and network i/o for ZooKeeper is important.
>
> Disadvantage: it's new.
>
> On Thu, Sep 6, 2012 at 7:49 AM, Stack <[EMAIL PROTECTED]> wrote:
>
> > On Wed, Sep 5, 2012 at 5:17 PM, Jonathan Hsieh <[EMAIL PROTECTED]> wrote:
> > > Here's a link to the pdf/picture.
> > >
> > > http://people.apache.org/~jmhsieh/hbase/120905-hbase-assignment.pdf
> > >
> >
> > Pretty picture.  Not a pretty story.
> >
> > What you thinking?
> >
> > St.Ack
> >
>

--
// Jonathan Hsieh (shay)
// Software Engineer, Cloudera
// [EMAIL PROTECTED]
+
Dave Wang 2012-09-06, 14:36
+
Jonathan Hsieh 2012-09-06, 10:16
+
Stack 2012-09-06, 20:28
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