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https://issues.apache.org/jira/browse/HDFS-8731?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14617980#comment-14617980
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Walter Su commented on HDFS-8731:
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Is it duplicated with HDFS-8563?
> Erasure coding: For a small file missing and under replicated ec-block
> calculation is incorrect
> ------------------------------------------------------------------------------------------------
>
> Key: HDFS-8731
> URL: https://issues.apache.org/jira/browse/HDFS-8731
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: J.Andreina
> 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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