J.Andreina created HDFS-8731:
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Summary: 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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