Improve error messages for failed completeFile
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Key: HDFS-1062
URL: https://issues.apache.org/jira/browse/HDFS-1062
Project: Hadoop HDFS
Issue Type: Improvement
Components: hdfs client, name-node
Reporter: Todd Lipcon
In practice I often see users confused by the cryptic error message "failed to
complete PATH because dir.getFileBlocks() is null and pendingFile is null" (I
wonder why!) The most common cause of this seems to be that another user
deleted the file (or its containing directory) while the writer was in progress.
We should at least improve the error message on the NN side. Even better would
be to expose the error message through the IOException passed over the RPC
boundary to the client.
Including a message like "(another client may have removed the file or its
containing directory)" should do the trick.
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