Chesnay Schepler created FLINK-9347:
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Summary: BlobServerConnection throws misleading exception for
empty files
Key: FLINK-9347
URL: https://issues.apache.org/jira/browse/FLINK-9347
Project: Flink
Issue Type: Improvement
Components: Local Runtime
Affects Versions: 1.5.0
Reporter: Chesnay Schepler
When downloading a file from the blob server that has a file size of 0 the
following exception occurs on the server:
{code}
java.io.EOFException: Received invalid result value. -1
at
org.apache.flink.runtime.blob.BlobServerConnection.get(BlobServerConnection.java:275)
at
org.apache.flink.runtime.blob.BlobServerConnection.run(BlobServerConnection.java:117)
{code}
The reason is that the client cannot differentiate between a download with no
more available data and an empty file, causing it to exit early in
{{BlobInputStream#read}} without writing back {{RETURN_OKAY}}.
This isn't necessarily a _problem_ in that sense as the file is properly
created on the client, but the exception is a tad misleading and may lead
debugging efforts down the wrong track (as has happened to me...).
We should either fail early for empty files, fix the behavior, or at the very
least at some warning log messages.
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