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From "Jing Zhao (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-9818) Correctly handle EC reconstruction work caused by not enough racks
Date Wed, 17 Feb 2016 01:23:18 GMT
Jing Zhao created HDFS-9818:
-------------------------------

             Summary: Correctly handle EC reconstruction work caused by not enough racks
                 Key: HDFS-9818
                 URL: https://issues.apache.org/jira/browse/HDFS-9818
             Project: Hadoop HDFS
          Issue Type: Sub-task
          Components: datanode, namenode
    Affects Versions: 3.0.0
            Reporter: Takuya Fukudome
            Assignee: Jing Zhao


This is reported by [~tfukudom]:

In a system test where 1 of 7 datanode racks were stopped, {{HadoopIllegalArgumentException}}
was seen on DataNode side while reconstructing missing EC blocks:
{code}
2016-02-16 11:09:06,672 WARN  datanode.DataNode (ErasureCodingWorker.java:run(482)) - Failed
to recover striped block: BP-480558282-172.29.4.13-1453805190696:blk_-9223372036850962784_278270
org.apache.hadoop.HadoopIllegalArgumentException: Inputs not fully corresponding to erasedIndexes
in null places. erasedOrNotToReadIndexes: [1, 2, 6], erasedIndexes: [3]
	at org.apache.hadoop.io.erasurecode.rawcoder.RSRawDecoder.doDecode(RSRawDecoder.java:166)
	at org.apache.hadoop.io.erasurecode.rawcoder.AbstractRawErasureDecoder.decode(AbstractRawErasureDecoder.java:84)
	at org.apache.hadoop.io.erasurecode.rawcoder.RSRawDecoder.decode(RSRawDecoder.java:89)
	at org.apache.hadoop.hdfs.server.datanode.erasurecode.ErasureCodingWorker$ReconstructAndTransferBlock.recoverTargets(ErasureCodingWorker.java:683)
	at org.apache.hadoop.hdfs.server.datanode.erasurecode.ErasureCodingWorker$ReconstructAndTransferBlock.run(ErasureCodingWorker.java:465)
{code}



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