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From "HBase Review Board (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-1511) Pseudo distributed mode in LocalHBaseCluster
Date Fri, 16 Jul 2010 21:00:50 GMT

    [ https://issues.apache.org/jira/browse/HBASE-1511?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12889326#action_12889326
] 

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

Message from: "Jonathan Gray" <jgray@apache.org>

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This is an automatically generated e-mail. To reply, visit:
http://review.hbase.org/r/328/#review417
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trunk/src/main/java/org/apache/hadoop/hbase/master/HMaster.java
<http://review.hbase.org/r/328/#comment1780>

    i think it's good to retain this option.  once the new load balancer goes into place,
you'll want it to not run the bulk placement to a small subset of the total servers during
boot.
    
    could always add a maxWait timeout as well.


- Jonathan





> 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: 0.92.0
>
>
> 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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