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https://issues.apache.org/jira/browse/AVRO-1529?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14718189#comment-14718189
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Manuel Godbert commented on AVRO-1529:
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Actually I wrote my own ConcatTool because we needed some intelligence in which
files to concat and which were big enough to let them alone. I reported the
JIRA on the ConcatTool for easier communication with Apache, after checking the
problem was not just mine. I did not keep the commands used for this test, but
I remember I just followed the provided documentation. Sorry :-)
> ConcatTool issue with empty files
> ---------------------------------
>
> Key: AVRO-1529
> URL: https://issues.apache.org/jira/browse/AVRO-1529
> Project: Avro
> Issue Type: Bug
> Components: java
> Affects Versions: 1.7.6
> Reporter: Manuel Godbert
>
> I am using the ConcatTool to merge 2 avro files. The first one is empty, the
> second one has records. The merged file is seen as empty when I am opening it.
> My investigations showed the cause is that DataFileWriter.appendAllFrom(...)
> copies blocks from source to target even if they are empty, and
> DataFileReader.hasNext() returns false if the first block of an avro file is
> empty.
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