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From "dhruba borthakur (JIRA)" <j...@apache.org>
Subject [jira] Created: (HDFS-1432) HDFS across data centers: HighTide
Date Thu, 30 Sep 2010 04:15:33 GMT
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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