Max Lapan created HDFS-4420:
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Summary: Provide a way to exclude subtree from balancing process
Key: HDFS-4420
URL: https://issues.apache.org/jira/browse/HDFS-4420
Project: Hadoop HDFS
Issue Type: Improvement
Components: balancer
Affects Versions: 0.20.2
Reporter: Max Lapan
Priority: Minor
Fix For: 0.20.2
During balancer operation, it balances all blocks, regardless of their
filesystem hierarchy. Sometimes, it would be usefull to exclude some subtree
from balancing process.
For example, regionservers data locality is cruical for HBase performance.
Region's data is tied to regionservers, which reside on specific machines in
cluster. During operation, regionservers reads and writes region's data, and
after some time, all this data are reside on local machine, so, all reads
become local, which is great for performance. Balancer breaks this locality
during opertation by moving blocks around.
This patch adds [-exclude <path>] switch, and, if path is provided,
balancer will not move blocks under this path during operation.
Attached patch have tested for 0.90.2.
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