DFS client should throw version mismatch errors in case of a changed
functionality
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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.
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Note that I *did not* do it on purpose but forgot to replace the older
installation with the newer one.
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