HDFS across data centers: HighTide
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Key: HDFS-1432
URL: https://issues.apache.org/jira/browse/HDFS-1432
Project: Hadoop HDFS
Issue Type: Improvement
Reporter: dhruba borthakur
Assignee: dhruba borthakur
here are many instances when the same piece of data resides on multiple HDFS
clusters in different data centers. The primary reason being that the physical
limitation of one data center is insufficient to host the entire data set. In
that case, the administrator(s) typically partition that data into two (or
more) HDFS clusters on two different data centers and then duplicates some
subset of that data into both the HDFS clusters.
In such a situation, there will be six physical copies of data that is
duplicated, three copies in one data center and another three copies in another
data center. It would be nice if we can keep fewer than 3 replicas on each of
the data centers and have the ability to fix a replica in the local data center
by copying data from the remote copy in the remote data center.
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