Virajith Jalaparti created HDFS-13088:
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Summary: Allow HDFS files/blocks to be over-replicated.
Key: HDFS-13088
URL: https://issues.apache.org/jira/browse/HDFS-13088
Project: Hadoop HDFS
Issue Type: Sub-task
Reporter: Virajith Jalaparti
This JIRA is to add a per-file "over-replication" factor to HDFS. As mentioned
in HDFS-13069, the over-replication factor will be the excess replicas that
will be allowed to exist for a file or block. This is beneficial if the
application deems additional replicas for a file are needed. In the case of
HDFS-13069, it would allow copies of data in PROVIDED storage to be cached
locally in HDFS in a read-through manner.
The Namenode will not proactively meet the over-replication i.e., it does not
schedule replications if the number of replicas for a block is less than
(replication factor + over-replication factor) as long as they are more than
the replication factor of the file.
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