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From "Harsh J (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-3475) Make the replication monitor multipliers configurable
Date Thu, 21 Jun 2012 18:37:43 GMT

     [ https://issues.apache.org/jira/browse/HDFS-3475?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Harsh J updated HDFS-3475:
--------------------------

    Attachment: HDFS-3475.patch

Hi Aaron - Thanks! Can you take a look at this patch? I believe the existing tests already
cover the invalidation and replication work and the defaults are what there were as constants
previously. Let me know if you need me to do any more changes!
                
> Make the replication monitor multipliers configurable
> -----------------------------------------------------
>
>                 Key: HDFS-3475
>                 URL: https://issues.apache.org/jira/browse/HDFS-3475
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>    Affects Versions: 3.0.0
>            Reporter: Harsh J
>            Assignee: Harsh J
>            Priority: Trivial
>         Attachments: HDFS-3475.patch
>
>
> BlockManager currently hardcodes the following two constants:
> {code}
> private static final int INVALIDATE_WORK_PCT_PER_ITERATION = 32;
> private static final int REPLICATION_WORK_MULTIPLIER_PER_ITERATION = 2;
> {code}
> These are used to throttle/limit the amount of deletion and replication-to-other-DN work
done per heartbeat interval of a live DN.
> Not many have had reasons to want these changed so far but there have been a few requests
I've faced over the past year from a variety of clusters I've helped maintain. I think with
the improvements in disks and network thats already started to be rolled out in production
environments out there, changing these may start making sense to some.
> Lets at least make it advanced-configurable with proper docs that warn adequately, with
the defaults being what they are today. With hardcodes, it comes down to a recompile for admins,
which is not something they may like.
> Please let me know your thoughts.

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