[jira] [Commented] (AVRO-1035) Add the possibility to append to existing avro files
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https://issues.apache.org/jira/browse/AVRO-1035?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanelfocusedCommentId=13573711#comment-13573711
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Michael Malak commented on AVRO-1035:
-
ha...@cloudera.com has provided example code on how to accomplish HDFS Avro
append at https://gist.github.com/QwertyManiac/4724582
Add the possibility to append to existing avro files
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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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[jira] [Commented] (AVRO-1035) Add the possibility to append to existing avro files
[
https://issues.apache.org/jira/browse/AVRO-1035?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanelfocusedCommentId=13213874#comment-13213874
]
Doug Cutting commented on AVRO-1035:
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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