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From: "Ashutosh Chauhan (JIRA)" <jira@apache.org>
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Subject: [jira] [Commented] (HIVE-11977) Hive should handle an external avro
 table with zero length files present
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    [ https://issues.apache.org/jira/browse/HIVE-11977?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14941548#comment-14941548 ] 

Ashutosh Chauhan commented on HIVE-11977:
-----------------------------------------

Thanks for patch [~dossett] 
A 0-length file is an invalid Avro file, as in Avro's {{DataFileWriter}} will always write MAGIC header for version. Thats the reason {{DataFileReader}} expects it and throws up when it doesn't get one.
It seems these 0 length files got there because of some faulty generator process. Isn't it better to just not generate those 0 length files. Or, alternatively, delete these faulty files.

> 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
>         Attachments: HIVE-11977-2.patch, HIVE-11977.patch
>
>
> 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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