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From "Zhijie Shen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-9692) sequencefile reader throws EOFException on zero-length file
Date Wed, 03 Jul 2013 17:58:20 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-9692?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13699257#comment-13699257
] 

Zhijie Shen commented on HADOOP-9692:
-------------------------------------

IMHO, IOException and EOFException needs to be treated differently. EOFException is a signal
that indicate the end of the stream, such that what you're doing helps to surpass the case
of reading a zero-length file. In contrast, IOException can be raised according to a number
of other reasons. For example, the stream has already been closed before reading. If IOException
is caught as well, reading a closed stream of a non-zero-length file is going to be regarded
as reaching the end of stream as well. In this specific case, the function will enter the
if block, and throw "not a SequenceFile" IOException instead, which I think it is not appropriate.
                
> sequencefile reader throws EOFException on zero-length file
> -----------------------------------------------------------
>
>                 Key: HADOOP-9692
>                 URL: https://issues.apache.org/jira/browse/HADOOP-9692
>             Project: Hadoop Common
>          Issue Type: Bug
>    Affects Versions: 2.0.3-alpha, 2.1.0-beta, 2.0.5-alpha
>            Reporter: Chu Tong
>         Attachments: HADOOP-9692.patch, HADOOP-9692.patch, HADOOP-9692.patch, HADOOP-9692.patch
>
>
> sequencefile reader throws EOFException on zero-length file, stacktrace as shown:
> Caused by: java.io.EOFException
>         at java.io.DataInputStream.readFully(DataInputStream.java:180)
>         at java.io.DataInputStream.readFully(DataInputStream.java:152)
>         at org.apache.hadoop.io.SequenceFile$Reader.init(SequenceFile.java:1845)
>         at org.apache.hadoop.io.SequenceFile$Reader.initialize(SequenceFile.java:1810)
>         at org.apache.hadoop.io.SequenceFile$Reader.<init>(SequenceFile.java:1759)
>         at org.apache.hadoop.io.SequenceFile$Reader.<init>(SequenceFile.java:1773)
>         at org.apache.hadoop.mapred.SequenceFileRecordReader.<init>(SequenceFileRecordReader.java:49)
>         at org.apache.hadoop.mapred.SequenceFileInputFormat.getRecordReader(SequenceFileInputFormat.java:64)
>         at org.apache.hadoop.hive.ql.io.CombineHiveRecordReader.<init>(CombineHiveRecordReader.java:65)
>         ... 16 more

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