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https://issues.apache.org/jira/browse/HDFS-8365?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14537686#comment-14537686
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Walter Su commented on HDFS-8365:
---------------------------------
Sorry I didn't saw it. Of course.
> Erasure Coding: Badly treated when short of Datanode in StripedDataStreamer
> ---------------------------------------------------------------------------
>
> Key: HDFS-8365
> URL: https://issues.apache.org/jira/browse/HDFS-8365
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Walter Su
> Assignee: Walter Su
>
> Currently, each innerBlock of blockGroup should put on different node. One
> node can't has 2 innerBlock.
> If one node has 2 innerBlock, we have blockReport issue. The first reported
> innerBlock will be added to triplets, but the second won't.
> If we decide to not to support 2 innerBlock in one node. We should handle
> this situation, and output warning friendly.
> When there are only 8 DN, and ECSchema is RS-6-3
> {noformat}
> # bin/hdfs dfs -put README.txt /ecdir
> 15/05/11 13:48:30 WARN hdfs.DataStreamer: DataStreamer Exception
> java.lang.NullPointerException
> at
> java.util.concurrent.LinkedBlockingQueue.offer(LinkedBlockingQueue.java:410)
> at
> org.apache.hadoop.hdfs.DFSStripedOutputStream$Coordinator.putStripedBlock(DFSStripedOutputStream.java:115)
> at
> org.apache.hadoop.hdfs.StripedDataStreamer.locateFollowingBlock(StripedDataStreamer.java:120)
> at
> org.apache.hadoop.hdfs.DataStreamer.nextBlockOutputStream(DataStreamer.java:1360)
> at org.apache.hadoop.hdfs.DataStreamer.run(DataStreamer.java:457)
> at
> org.apache.hadoop.hdfs.StripedDataStreamer.run(StripedDataStreamer.java:48)
> 15/05/11 13:48:30 WARN hdfs.DFSOutputStream: Failed: closeImpl,
> DFSStripedOutputStream:#0: isFailed? f, null@null
> java.io.IOException: java.lang.NullPointerException
> at
> org.apache.hadoop.hdfs.DataStreamer$LastExceptionInStreamer.set(DataStreamer.java:183)
> at org.apache.hadoop.hdfs.DataStreamer.run(DataStreamer.java:571)
> at
> org.apache.hadoop.hdfs.StripedDataStreamer.run(StripedDataStreamer.java:48)
> Caused by: java.lang.NullPointerException
> at
> java.util.concurrent.LinkedBlockingQueue.offer(LinkedBlockingQueue.java:410)
> at
> org.apache.hadoop.hdfs.DFSStripedOutputStream$Coordinator.putStripedBlock(DFSStripedOutputStream.java:115)
> at
> org.apache.hadoop.hdfs.StripedDataStreamer.locateFollowingBlock(StripedDataStreamer.java:120)
> at
> org.apache.hadoop.hdfs.DataStreamer.nextBlockOutputStream(DataStreamer.java:1360)
> at org.apache.hadoop.hdfs.DataStreamer.run(DataStreamer.java:457)
> ... 1 more
> 15/05/11 13:48:30 WARN hdfs.DFSOutputStream: Failed: closeImpl,
> DFSStripedOutputStream:#1: isFailed? f, null@null
> java.nio.channels.ClosedChannelException
> at
> org.apache.hadoop.hdfs.DataStreamer$LastExceptionInStreamer.throwException4Close(DataStreamer.java:208)
> at
> org.apache.hadoop.hdfs.DFSOutputStream.checkClosed(DFSOutputStream.java:146)
> at
> org.apache.hadoop.hdfs.DFSOutputStream.flushInternal(DFSOutputStream.java:713)
> {noformat}
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