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https://issues.apache.org/jira/browse/HDFS-16479?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17517186#comment-17517186
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Takanobu Asanuma commented on HDFS-16479:
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I updated the title of this jira, and submit a PR.
[~yuanbo] [~surendralilhore] [~ayushtkn] Could you review the PR?
> EC: NameNode should not send a reconstruction work when the source datanodes
> are insufficient
> ---------------------------------------------------------------------------------------------
>
> Key: HDFS-16479
> URL: https://issues.apache.org/jira/browse/HDFS-16479
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: ec, erasure-coding
> Reporter: Yuanbo Liu
> Priority: Critical
> Labels: pull-request-available
> Time Spent: 10m
> Remaining Estimate: 0h
>
> We got this exception from DataNodes
> {color:#707070}java.lang.IllegalArgumentException: No enough live striped
> blocks.{color}
> {color:#707070} at
> com.google.common.base.Preconditions.checkArgument(Preconditions.java:141){color}
> {color:#707070} at
> org.apache.hadoop.hdfs.server.datanode.erasurecode.StripedReader.<init>(StripedReader.java:128){color}
> {color:#707070} at
> org.apache.hadoop.hdfs.server.datanode.erasurecode.StripedReconstructor.<init>(StripedReconstructor.java:135){color}
> {color:#707070} at
> org.apache.hadoop.hdfs.server.datanode.erasurecode.StripedBlockReconstructor.<init>(StripedBlockReconstructor.java:41){color}
> {color:#707070} at
> org.apache.hadoop.hdfs.server.datanode.erasurecode.ErasureCodingWorker.processErasureCodingTasks(ErasureCodingWorker.java:133){color}
> {color:#707070} at
> org.apache.hadoop.hdfs.server.datanode.BPOfferService.processCommandFromActive(BPOfferService.java:796){color}
> {color:#707070} at
> org.apache.hadoop.hdfs.server.datanode.BPOfferService.processCommandFromActor(BPOfferService.java:680){color}
> {color:#707070} at
> org.apache.hadoop.hdfs.server.datanode.BPServiceActor$CommandProcessingThread.processCommand(BPServiceActor.java:1314){color}
> {color:#707070} at
> org.apache.hadoop.hdfs.server.datanode.BPServiceActor$CommandProcessingThread.lambda$enqueue$2(BPServiceActor.java:1360){color}
> {color:#707070} at
> org.apache.hadoop.hdfs.server.datanode.BPServiceActor$CommandProcessingThread.processQueue(BPServiceActor.java:1287){color}
> After going through the code of ErasureCodingWork.java, we found
> {code:java}
> targets[0].getDatanodeDescriptor().addBlockToBeErasureCoded( new
> ExtendedBlock(blockPoolId, stripedBlk), getSrcNodes(), targets,
> getLiveBlockIndicies(), stripedBlk.getErasureCodingPolicy());
> {code}
>
> the liveBusyBlockIndicies is not considered as liveBlockIndicies, hence
> erasure coding reconstruction sometimes will fail as 'No enough live striped
> blocks'.
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