[ https://issues.apache.org/jira/browse/HDFS-8731?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
J.Andreina resolved HDFS-8731. ------------------------------ Resolution: Duplicate > 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} -- This message was sent by Atlassian JIRA (v6.3.4#6332)