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https://issues.apache.org/jira/browse/HDFS-3475?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Suresh Srinivas updated HDFS-3475:
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This change adds two new configuration parameters.
# {{dfs.namenode.invalidate.work.pct.per.iteration}} for controlling deletion
rate of blocks.
# {{dfs.namenode.invalidate.work.pct.per.iteration}} for controlling
replication rate. This in turn allows controlling the time it takes for
decommissioning.
Please see hdfs-default.xml for detailed description.
> 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: 2.0.0-alpha
> Reporter: Harsh J
> Assignee: Harsh J
> Priority: Trivial
> Fix For: 2.1.0-alpha
>
> Attachments: HDFS-3475.patch, HDFS-3475.patch, 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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