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https://issues.apache.org/jira/browse/AVRO-1035?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13213874#comment-13213874
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Doug Cutting commented on AVRO-1035:
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Note that append is not reliable in current Hadoop releases. "Append support"
in Hadoop 1.0 just means that flush() works reliably, not that append actually
works. Append should be reliable in 0.23 releases although I doubt it's been
well tested there yet.
> Add the possibility to append to existing avro files
> ------------------------------------------------------
>
> Key: AVRO-1035
> URL: https://issues.apache.org/jira/browse/AVRO-1035
> Project: Avro
> Issue Type: New Feature
> Reporter: Vyacheslav Zholudev
>
> Currently it is not possible to append to avro files that were written and
> closed.
> Here is a Scott Carey's reply on the mailing list:
> {quote}
> It is not possible without modifying DataFileWriter. Please open a JIRA
> ticket.
> It could not simply append to an OutputStream, since it must either:
> * Seek to the start to validate the schemas match and find the sync
> marker, or
> * Trust that the schemas match and find the sync marker from the last block
> DataFileWriter cannot refer to Hadoop classes such as FileSystem, but we
> could add something to the mapred module that takes a Path and FileSystem
> and returns
> something that implemements an interface that DataFileWriter can append
> to. This would be something that is both a
> http://avro.apache.org/docs/1.6.2/api/java/org/apache/avro/file/SeekableInp
> ut.html
> and an OutputStream, or has both an InputStream from the start of the
> existing file and an OutputStream at the end.
> {quote}
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