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https://issues.apache.org/jira/browse/HADOOP-3996?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12624596#action_12624596
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dhruba borthakur commented on HADOOP-3996:
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If there is a protocol mismatch between client and server, then dfs will bail
out. In your case, it is possible that the protcol versionnumber was not bumped
up when the new feature was introduced.
> DFS client should throw version mismatch errors in case of a changed
> functionality
> ----------------------------------------------------------------------------------
>
> Key: HADOOP-3996
> URL: https://issues.apache.org/jira/browse/HADOOP-3996
> Project: Hadoop Core
> Issue Type: Bug
> Components: dfs
> Reporter: Amar Kamat
>
> I started a hadoop cluster, built with the (latest) trunk and tried doing
> _dfs -put_ with the (dfs) clients from the (older/stale) trunk. The client
> went ahead and tried to upload the data onto the cluster and failed with the
> following error
> {noformat}
> -bash-3.00$ ./bin/hadoop dfs -put file file
> 08/08/22 05:11:06 INFO hdfs.DFSClient: Exception in createBlockOutputStream
> java.io.IOException: Could not read from stream
> 08/08/22 05:11:06 INFO hdfs.DFSClient: Abandoning block
> blk_5748330682182803489_1002
> 08/08/22 05:11:12 INFO hdfs.DFSClient: Exception in createBlockOutputStream
> java.io.IOException: Could not read from stream
> 08/08/22 05:11:12 INFO hdfs.DFSClient: Abandoning block
> blk_7482082538144151768_1002
> 08/08/22 05:11:18 INFO hdfs.DFSClient: Exception in createBlockOutputStream
> java.io.IOException: Could not read from stream
> 08/08/22 05:11:18 INFO hdfs.DFSClient: Abandoning block
> blk_-3132217232090937466_1002
> 08/08/22 05:11:24 INFO hdfs.DFSClient: Exception in createBlockOutputStream
> java.io.IOException: Could not read from stream
> 08/08/22 05:11:24 INFO hdfs.DFSClient: Abandoning block
> blk_-6473055472384366978_1002
> 08/08/22 05:11:30 WARN hdfs.DFSClient: DataStreamer Exception:
> java.io.IOException: Unable to create new block.
> at
> org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.nextBlockOutputStream(DFSClient.java:2504)
> at
> org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.access$2000(DFSClient.java:1810)
> at
> org.apache.hadoop.hdfs.DFSClient$DFSOutputStream$DataStreamer.run(DFSClient.java:1990)
> put: Filesystem closed
> {noformat}
> It would be better if somehow the client detects that its not *made* for this
> master and softly/simply bail out.
> ----
> Note that I *did not* do it on purpose but forgot to replace the older
> installation with the newer one.
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