[jira] [Created] (HDFS-10082) CLONE - Erasure Coding: Badly treated when short of Datanode in StripedDataStreamer

["dragon (JIRA)" <ji...@apache.org>]

dragon created HDFS-10082:
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             Summary: CLONE - Erasure Coding: Badly treated when short of Datanode in StripedDataStreamer
                 Key: HDFS-10082
                 URL: https://issues.apache.org/jira/browse/HDFS-10082
             Project: Hadoop HDFS
          Issue Type: Sub-task
            Reporter: dragon
            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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