hadoop-hdfs-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Harsh J (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-782) dynamic replication
Date Tue, 20 Nov 2012 07:39:02 GMT

    [ https://issues.apache.org/jira/browse/HDFS-782?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13500886#comment-13500886

Harsh J commented on HDFS-782:

Hey Putu,

I do not know of anyone already working on this, but you are welcome to!
> dynamic replication
> -------------------
>                 Key: HDFS-782
>                 URL: https://issues.apache.org/jira/browse/HDFS-782
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>            Reporter: Ning Zhang
> In a large and busy cluster, a block can be requested by many clients at the same time.
HDFS-767 tries to solve the failing case when the # of retries exceeds the maximum # of retries.
However, that patch doesn't solve the performance issue since all failing clients have to
wait a certain period before retry, and the # of retries could be high. 
> One solution to solve the performance issue is to increase the # of replicas for this
"hot" block dynamically when it is requested many times at a short period. The name node need
to be aware such situation and only clean up extra replicas when they are not accessed recently.

This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators
For more information on JIRA, see: http://www.atlassian.com/software/jira

View raw message