hadoop-common-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Pete Wyckoff (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-4065) support for reading binary data from flat files
Date Tue, 09 Sep 2008 01:43:44 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-4065?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Pete Wyckoff updated HADOOP-4065:
---------------------------------

    Attachment: ThriftFlatFile.java

psuedo-esque code that implements Thrift in FlatFiles where the filename is used as the key
to get the thrift class from the configuration.  Implements <LongWritable, ThriftWritable>;

Of course, it may be that we want to use the serialization classes.


> support for reading binary data from flat files
> -----------------------------------------------
>
>                 Key: HADOOP-4065
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4065
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: mapred
>            Reporter: Joydeep Sen Sarma
>         Attachments: HADOOP-4065.0.txt, ThriftFlatFile.java
>
>
> like textinputformat - looking for a concrete implementation to read binary records from
a flat file (that may be compressed).
> it's assumed that hadoop can't split such a file. so the inputformat can set splittable
to false.
> tricky aspects are:
> - how to know what class the file contains (has to be in a configuration somewhere).
> - how to determine EOF (would be nice if hadoop can determine EOF and not have the deserializer
throw an exception  (which is hard to distinguish from a exception due to corruptions?)).
this is easy for non-compressed streams - for compressed streams - DecompressorStream has
a useful looking getAvailable() call - except the class is marked package private.

-- 
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.


Mime
View raw message