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
Accumulo >> mail # user >> Using Accumulo as input to a MapReduce job frequently hangs due to lost Zookeeper connection


Copy link to this message
-
Re: Using Accumulo as input to a MapReduce job frequently hangs due to lost Zookeeper connection
On Wed, Oct 10, 2012 at 7:22 AM, ameet kini <[EMAIL PROTECTED]> wrote:

> I have a related problem where I need to do a 1-1 join (every row in
> table A joins with a unique row in table B and vice versa). My join
> key is the row id of the table. In the past, I've used Hadoop's
> CompositeInputFormat to do a map-side join over data in HDFS
> (described here
> http://www.congiu.com/joins-in-hadoop-using-compositeinputformat/)  My
> tables in Accumulo seem to fit the eligibility criteria of
> CompositeInputFormat: both tables are sorted by the join key, since
> the join key is the row id in my case, and the tables are partitioned
> the same way (i.e., same split points).
>
> Has anyone tried using CompositeInputFormat over Accumulo tables? Is
> it possible to configure CompositeInputFormat with
> AccumuloInputFormat?
>

I haven't tried it.  If you do, let us know how it works out.

Billie
>
> Thanks,
> Ameet
>
>
> On Tue, Aug 21, 2012 at 8:23 AM, Keith Turner <[EMAIL PROTECTED]> wrote:
> > Yeah, that would certainly work.
> >
> > You could run two map only jobs (could run concurrently).  A job that
> > reads D1 and writes to Table3 and a job that reads D2 and writes
> > Table3.   Map reduce may be faster, unless you want the final result
> > in Accumulo in which case this may be faster.  The two map reduce jobs
> > could also produce files to bulk import into table3.
> >
> > Keith
> >
> > On Mon, Aug 20, 2012 at 8:26 PM, David Medinets
> > <[EMAIL PROTECTED]> wrote:
> >> Can you use a new table to join and then scan the new table? Use the
> foreign
> >> key as the rowid. Basically create your own materialized view.
>
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