[jira] [Created] (HDFS-10136) CLONE - Erasure coding: For a small file missing and under replicated ec-block calculation is incorrect

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

dragon created HDFS-10136:
-----------------------------

             Summary: CLONE - Erasure coding: For a small file missing and under replicated ec-block calculation is incorrect 
                 Key: HDFS-10136
                 URL: https://issues.apache.org/jira/browse/HDFS-10136
             Project: Hadoop HDFS
          Issue Type: Sub-task
            Reporter: dragon
            Assignee: J.Andreina


Write a small file (whose replica detail would be : one data replica and 3 parity replicas .)

Now :
	totalReplicasPerBlock = 4 
	targetFileReplication = 9 (calculated based on default RS-6-3 schema)

Hence the small file ec-blocks is calculated as always missing and underreplicated. which is wrong... 

{code}
targetFileReplication = (short) (ecSchema.getNumDataUnits() + ecSchema.getNumParityUnits());
{code}
{code}
      // count missing replicas / under replicated blocks
      if (totalReplicasPerBlock < targetFileReplication && totalReplicasPerBlock > 0) {
        res.missingReplicas += (targetFileReplication - totalReplicasPerBlock);
	res.numUnderReplicatedBlocks += 1;
{code}



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