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https://issues.apache.org/jira/browse/HDFS-8220?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14651342#comment-14651342
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Walter Su commented on HDFS-8220:
---------------------------------
For contiguous block, one DN can't have two replicas. It's not just placement
policy. Client, DN, BlockManager all have such assumption. We don't want to
remove this restriction for striping. It might have severe impact.
> Erasure Coding: StripedDataStreamer fails to handle the blocklocations which
> doesn't satisfy BlockGroupSize
> -----------------------------------------------------------------------------------------------------------
>
> Key: HDFS-8220
> URL: https://issues.apache.org/jira/browse/HDFS-8220
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Rakesh R
> Assignee: Rakesh R
> Attachments: HDFS-8220-001.patch, HDFS-8220-002.patch,
> HDFS-8220-003.patch, HDFS-8220-004.patch, HDFS-8220-HDFS-7285.005.patch,
> HDFS-8220-HDFS-7285.006.patch, HDFS-8220-HDFS-7285.007.patch,
> HDFS-8220-HDFS-7285.007.patch, HDFS-8220-HDFS-7285.008.patch
>
>
> During write operations {{StripedDataStreamer#locateFollowingBlock}} fails to
> validate the available datanodes against the {{BlockGroupSize}}. Please see
> the exception to understand more:
> {code}
> 2015-04-22 14:56:11,313 WARN hdfs.DFSClient (DataStreamer.java:run(538)) -
> DataStreamer Exception
> java.lang.NullPointerException
> at
> java.util.concurrent.LinkedBlockingQueue.offer(LinkedBlockingQueue.java:374)
> at
> org.apache.hadoop.hdfs.StripedDataStreamer.locateFollowingBlock(StripedDataStreamer.java:157)
> at
> org.apache.hadoop.hdfs.DataStreamer.nextBlockOutputStream(DataStreamer.java:1332)
> at org.apache.hadoop.hdfs.DataStreamer.run(DataStreamer.java:424)
> at
> org.apache.hadoop.hdfs.StripedDataStreamer.run(StripedDataStreamer.java:1)
> 2015-04-22 14:56:11,313 INFO hdfs.MiniDFSCluster
> (MiniDFSCluster.java:shutdown(1718)) - Shutting down the Mini HDFS Cluster
> 2015-04-22 14:56:11,313 ERROR hdfs.DFSClient
> (DFSClient.java:closeAllFilesBeingWritten(608)) - Failed to close inode 16387
> java.io.IOException: DataStreamer Exception:
> at org.apache.hadoop.hdfs.DataStreamer.run(DataStreamer.java:544)
> at
> org.apache.hadoop.hdfs.StripedDataStreamer.run(StripedDataStreamer.java:1)
> Caused by: java.lang.NullPointerException
> at
> java.util.concurrent.LinkedBlockingQueue.offer(LinkedBlockingQueue.java:374)
> at
> org.apache.hadoop.hdfs.StripedDataStreamer.locateFollowingBlock(StripedDataStreamer.java:157)
> at
> org.apache.hadoop.hdfs.DataStreamer.nextBlockOutputStream(DataStreamer.java:1332)
> at org.apache.hadoop.hdfs.DataStreamer.run(DataStreamer.java:424)
> ... 1 more
> {code}
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