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From "Tsz Wo Nicholas Sze (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-9818) Correctly handle EC reconstruction work caused by not enough racks
Date Fri, 19 Feb 2016 23:20:18 GMT

    [ https://issues.apache.org/jira/browse/HDFS-9818?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15155123#comment-15155123
] 

Tsz Wo Nicholas Sze commented on HDFS-9818:
-------------------------------------------

+1 on the latest patch.

> 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
>         Attachments: HDFS-9818.000.patch, HDFS-9818.001.patch, HDFS-9818.002.patch, HDFS-9818.003.patch,
HDFS-9818.004.patch
>
>
> 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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