Ming Ma created HDFS-8876:
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Summary: Make hard coded parameters used by balancer and other
tools configurable
Key: HDFS-8876
URL: https://issues.apache.org/jira/browse/HDFS-8876
Project: Hadoop HDFS
Issue Type: Improvement
Reporter: Ming Ma
Assignee: Chris Trezzo
During investigation of how to speed up balancer, at least to the level
specified by {{dfs.datanode.balance.bandwidthPerSec}}, we found that parameters
such as {{MAX_BLOCKS_SIZE_TO_FETCH}} and {{SOURCE_BLOCKS_MIN_SIZE}} are hard
coded. These parameters are related to block size and other configurable
parameters used by balancer. So least we should make it configurable. In the
longer term, it might be interesting to understand if we simplify all these
related configurations.
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