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From "Patrick Hunt (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-5670) Hadoop configurations should be read from a distributed system
Date Tue, 06 Apr 2010 18:29:33 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-5670?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12854108#action_12854108
] 

Patrick Hunt commented on HADOOP-5670:
--------------------------------------

bq. would be interesting to know how well used the security components of ZK are

ZK has plugable auth with acls on the znodes. Yahoo uses this internally for multi-tenant
ZK clusters, the auth
in this case is Yahoo specific implementation (uses certificates). We have met with the Yahoo
Hadoop Security
team, we don't have a kerberos plugin for ZK auth yet but we have discussed it.

bq. you can run Hadoop without using ZK

that's true for MR/HDFS today, it may not be so in future.

HBase requires ZK today, so if you're using HBase you're already using ZK. ;-)

bq. LDAP is a well understood technology by most IT departments and ZK is not

I agree with this, in general most IT departments are going to be much more familiar with
technologies such
as LDAP, MySQL, Exchange, etc... that have been around for a while. This is a big plus. ZK
is still very new
relative to these mature technologies. (although the same could be said for Hadoop itself).


> Hadoop configurations should be read from a distributed system
> --------------------------------------------------------------
>
>                 Key: HADOOP-5670
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5670
>             Project: Hadoop Common
>          Issue Type: New Feature
>          Components: conf
>            Reporter: Allen Wittenauer
>
> Rather than distributing the hadoop configuration files to every data node, compute node,
etc, Hadoop should be able to read configuration information (dynamically!) from LDAP, ZooKeeper,
whatever.

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