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From "Sanjay Radia (JIRA)" <j...@apache.org>
Subject [jira] Issue Comment Edited: (HADOOP-3486) Change default for initial block report to 0 sec and document it in hadoop-defaults.xml
Date Tue, 03 Jun 2008 22:20:45 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3486?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12602088#action_12602088
] 

sanjay.radia edited comment on HADOOP-3486 at 6/3/08 3:19 PM:
--------------------------------------------------------------


I had set the default for common mid sized cluster (100-400 nodes).
Looks like we should really do  HADOOP-2444 which automates the backoff parameter.
I guess the argument is that the person running the one node cluster needs to right default
value and that only one running a larger cluster is smart enough to configure  the
appropriate delay parameter.

Jira description and patch has been updated to set the default to 0.

      was (Author: sanjay.radia):
    Good case to make it shorter; do you literally mean 0 sec or something short like 5sec?
I had set the default for common mid sized cluster (100-400 nodes).
Looks like we should really do  HADOOP-2444 which automates the backoff parameter.
I guess the argument is that the person running the one node cluster needs to right default
value and that only one running a larger cluster is smart enough to configure  the
appropriate delay parameter.
  
> Change default for initial block report to 0 sec and document it in hadoop-defaults.xml
> ---------------------------------------------------------------------------------------
>
>                 Key: HADOOP-3486
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3486
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: dfs
>            Reporter: Sanjay Radia
>            Assignee: Sanjay Radia
>             Fix For: 0.18.0
>
>         Attachments: hadoopDefaults4Delay.patch, hadoopDefaults4Delay2.patch
>
>
> HADOOP-2326 added a new config parameter for the initial block report that gets sent
after DataNode registration.
> The default value for this parameter was 60 sec.
> This Jira changes the default to 0 sec -  the approriate default for 1 node or small
clusters (say  less than 50 nodes)
> This Jira also documents the config parameter in  hadoop-defaults.xml

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