Harsh J created HDFS-3475:
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Summary: 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
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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