[jira] [Created] (MAPREDUCE-6877) Assign map task preferentially to the data node where the split is on faster storage type

["Tim Yao (JIRA)" <ji...@apache.org>]

Tim Yao created MAPREDUCE-6877:
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             Summary: Assign map task preferentially to the data node where the split is on faster storage type
                 Key: MAPREDUCE-6877
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-6877
             Project: Hadoop Map/Reduce
          Issue Type: Improvement
            Reporter: Tim Yao


SSD has been widely used in HDFS to improve reading/writing performance. However, SSD costs much more than HDD, so there is a tradeoff policy ONE-SSD to balance the performance and cost. But there occurs a problem whether applications will read the replication on SSD. If applications cannot read the replication on SSD, the advantage of SSD can no longer be utilized, which will lead to much poorer performance compared to ALL-SSD policy. The current MapReduce only assign tasks according to data locality. The storage types of all the replications of each split should also been taken into consideration in order to assign map task preferentially to a node where its split is located on a faster storage type.



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