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Date: Fri, 12 Jul 2013 22:37:49 +0000 (UTC)
From: "Suresh Srinivas (JIRA)" <jira@apache.org>
To: hdfs-dev@hadoop.apache.org
Message-ID: <JIRA.12657539.1373668619409.43352.1373668669104@arcas>
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Subject: [jira] [Created] (HDFS-4990) Block placement for storage types
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Suresh Srinivas created HDFS-4990:
-------------------------------------

             Summary: Block placement for storage types
                 Key: HDFS-4990
                 URL: https://issues.apache.org/jira/browse/HDFS-4990
             Project: Hadoop HDFS
          Issue Type: Sub-task
          Components: namenode
            Reporter: Suresh Srinivas


Currently block location for writes are made based on:
# Datanode load (number of transceivers)
# Space left on datanode
# Topology

With storage abstraction, namenode must choose a storage instead of a datanode for block placement. It also needs to consider storage type, load on the storage etc.

As an additional benefit, currently HDFS support heterogeneous nodes (nodes with different number of spindles etc.) poorly. This work should help solve that issue as well.

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