[jira] [Commented] (HIVE-11977) Hive should handle an external avro table with zero length files present

["Aaron Dossett (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HIVE-11977?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14933731#comment-14933731 ] 

Aaron Dossett commented on HIVE-11977:
--------------------------------------

Uploading my first take at a fix.  I am working on adding appropriate unit / integration tests, but any feedback would be welcome in the meantime.

> Hive should handle an external avro table with zero length files present
> ------------------------------------------------------------------------
>
>                 Key: HIVE-11977
>                 URL: https://issues.apache.org/jira/browse/HIVE-11977
>             Project: Hive
>          Issue Type: Bug
>            Reporter: Aaron Dossett
>            Assignee: Aaron Dossett
>
> If a zero length file is in the top level directory housing an external avro table,  all hive queries on the table fail.
> This issue is that org.apache.hadoop.hive.ql.io.avro.AvroGenericRecordReader creates a new org.apache.avro.file.DataFileReader and DataFileReader throws an exception when trying to read an empty file (because the empty file lacks the magic number marking it as avro).  
> AvroGenericRecordReader should detect an empty file and then behave reasonably.
> Caused by: java.io.IOException: Not a data file.
> at org.apache.avro.file.DataFileStream.initialize(DataFileStream.java:102)
> at org.apache.avro.file.DataFileReader.<init>(DataFileReader.java:97)
> at org.apache.hadoop.hive.ql.io.avro.AvroGenericRecordReader.<init>(AvroGenericRecordReader.java:81)
> at org.apache.hadoop.hive.ql.io.avro.AvroContainerInputFormat.getRecordReader(AvroContainerInputFormat.java:51)
> at org.apache.hadoop.hive.ql.io.HiveInputFormat.getRecordReader(HiveInputFormat.java:246)
> ... 25 more



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