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https://issues.apache.org/jira/browse/HADOOP-3996?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12624612#action_12624612
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Amar Kamat commented on HADOOP-3996:
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I think even the build version should be checked if bumping the protocol
version for every related issue is not feasible.
> 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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