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From "Amar Kamat (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3996) DFS client should throw version mismatch errors in case of a changed functionality
Date Fri, 22 Aug 2008 07:52:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3996?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12624612#action_12624612
] 

Amar Kamat commented on HADOOP-3996:
------------------------------------

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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