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From "HBase Review Board (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-1511) Pseudo distributed mode in LocalHBaseCluster
Date Fri, 08 Oct 2010 22:16:35 GMT

    [ https://issues.apache.org/jira/browse/HBASE-1511?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12919396#action_12919396
] 

HBase Review Board commented on HBASE-1511:
-------------------------------------------

Message from: stack@duboce.net


bq.  On 2010-07-16 13:39:10, stack wrote:
bq.  > trunk/bin/local-master-backup.sh, line 1
bq.  > <http://review.cloudera.org/r/328/diff/1/?file=2844#file2844line1>
bq.  >
bq.  >     Why is it called local-master-backup?  Should be a more descriptive name?  Its
the 'backup' that throws me off.  'local-masters'?
bq.  >
bq.  
bq.  Nicolas wrote:
bq.      This JIRA also needs an associated wiki article change.  So, the workflow would be:
bq.      
bq.      ./bin/start-hbase.sh
bq.      ./bin/local-master-backup start 1
bq.      
bq.      I don't think you would want to use this file to start the original master, use start-hbase.sh
for that.  You primarily want to use this script to test master failover conditions.

Don't write a wiki article.  Add an article under src/site, under xdoc or apt (not yet in
place).  This can be done in a separate issue.  Meantime, on commit I can add the above  on
how its used (w/o it, I was a little baffled but just those few lines above explain it all
-- for me at least).


bq.  On 2010-07-16 13:39:10, stack wrote:
bq.  > trunk/bin/local-master-backup.sh, line 10
bq.  > <http://review.cloudera.org/r/328/diff/1/?file=2844#file2844line10>
bq.  >
bq.  >     Explain 'offset' in this usage output?  (Seems to be port offset from default?)
bq.  
bq.  Nicolas wrote:
bq.      offset is not only the port offset, but also an identifier for the logs.  The log
for "./bin/local-master-backup.sh start 1" would be located at logs/hbase-<user>-1-master-<server>.log
bq.      
bq.      In an internal review, Kannan asked why you couldn't use "start 0", I thought offset
would help explain that issue.  opinions?

Hmm... maybe you do need an article on how this stuff works.   Smile.  Offset is fine (Is
Kannan saying that a 'start 0' should be rejected?).  If you put together a paragraph or two,
I'll take care of sticking it into proper format.


- stack


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> Pseudo distributed mode in LocalHBaseCluster
> --------------------------------------------
>
>                 Key: HBASE-1511
>                 URL: https://issues.apache.org/jira/browse/HBASE-1511
>             Project: HBase
>          Issue Type: Improvement
>    Affects Versions: 0.19.3
>            Reporter: Evgeny Ryabitskiy
>            Assignee: Nicolas Spiegelberg
>            Priority: Minor
>             Fix For: 0.90.0
>
>         Attachments: HBASE-1511.patch, psuedo-distribute hbase usage.txt
>
>
> After changes to config and adding of parameter:
> {code}
>   <property>
>     <name>hbase.cluster.distributed</name>
>     <value>false</value>
>     <description>The mode the cluster will be in. Possible values are
>       false: standalone and pseudo-distributed setups with managed Zookeeper
>       true: fully-distributed with unmanaged Zookeeper Quorum (see hbase-env.sh)
>     </description>
>   </property>
> {code}
> running HBase in pseudo destr mode become not so easy, I think description for false
variant is wrong and you can't get pseudo-distributed mode setting this option to false now.
> I wish to have some option in LocalHBaseCluster for pseudo destr mode where I wish to
have:
>  * separate processes for Master and HRSs
>  * ability to dynamically change HRS number in cluster
>  * managed ZK cluster (like it is in local mode now)
>  * managed small local HDFS cluster
> I think it is very useful for testing, debugging and for user experience with HBase,
who want to try something close to real HBase not some emulation in standalone mode.

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