Amos Bird created HDFS-11256:
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Summary: Rebalance specific directory
Key: HDFS-11256
URL: https://issues.apache.org/jira/browse/HDFS-11256
Project: Hadoop HDFS
Issue Type: New Feature
Components: balancer & mover
Affects Versions: 3.0.0-alpha1
Reporter: Amos Bird
Fix For: 3.0.0-alpha1
Currently hdfs only supports rebalancing over entire cluster. This might not be
utilized by data processing systems like hive, spark, impala etl.
In hive, we may need to maximize some fact tables IO performance by carefully
sharding their blocks evenly over all disks. Normally a INSERT SELECT is done
to achieve such redistributing progress.
Given a table is backed by one directory on hdfs, rebalancing specific dir may
be very useful.
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