Stephen O'Donnell created HDFS-14560:
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Summary: Allow block replication parameters to be refreshable
Key: HDFS-14560
URL: https://issues.apache.org/jira/browse/HDFS-14560
Project: Hadoop HDFS
Issue Type: Improvement
Components: namenode
Affects Versions: 3.3.0
Reporter: Stephen O'Donnell
Assignee: Stephen O'Donnell
There are 3 key parameters that control the speed of block replication across
the cluster:
{code}
dfs.namenode.replication.max-streams
dfs.namenode.replication.max-streams-hard-limit
dfs.namenode.replication.work.multiplier.per.iteration
{code}
These are used when decomissioning nodes and when under replicated blocks are
being recovered across the cluster. There are times when it may be desirable to
increase the speed of replication and then reduce it again (eg during off peak
hours) without restarting the namenode.
Therefore it would be good to be able to reconfigure / refresh these parameters
dynamically without a namenode restart.
This Jira is to allow these parameters to be refreshed at runtime without a
restart.
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