dragon created HDFS-10003:
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             Summary: CLONE - Erasure Coding: simplify striped block recovery 
work computation and add tests
                 Key: HDFS-10003
                 URL: https://issues.apache.org/jira/browse/HDFS-10003
             Project: Hadoop HDFS
          Issue Type: Sub-task
            Reporter: dragon
            Assignee: Jing Zhao
             Fix For: HDFS-7285


HDFS-7369 adds the functionality to distribute recovery work of striped blocks 
to datanodes. There are still some pending issues:
# In {{BlockManager#chooseSourceNode}}, a node is added into {{healthyIndices}} 
without checking if its block is live and healthy
# The test {{TestRecoverStripedBlcoks#testMissingStripedBlock}} has not tested 
striped blocks because the file is created before setting the storage policy
# In {{computeRecoveryWorkForBlocks}}, instead of using 
{{BlockCollection#isStriped}}, we'd better use {{BlockInfo#isStriped}}



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