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From "Tao Jie (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MAPREDUCE-6459) native task crashes when merging spilled file on ppc64
Date Mon, 24 Aug 2015 01:53:45 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-6459?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Tao Jie updated MAPREDUCE-6459:
-------------------------------
    Assignee: Tao Jie
      Status: Patch Available  (was: Open)

> native task crashes when merging spilled file on ppc64
> ------------------------------------------------------
>
>                 Key: MAPREDUCE-6459
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-6459
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>    Affects Versions: 2.6.0
>         Environment: Linux version 2.6.32-431.el6.ppc64
>            Reporter: Tao Jie
>            Assignee: Tao Jie
>         Attachments: MAPREDUCE-6459.001.patch, ppc64_error.txt
>
>
> when running native task on ppc64´╝îmerging spilled files fails since we could not deserialize
local spill file correctly.
> Function readVLong in WritableUtils.h and Buffers.h, we try to compare a char with a
number and convert a char to int64_t. It does not work correctly on ppc64 since char definition
is different between ppc64 and x86 platform. On x86 platform char is defined as signed number
while on ppc64 char is unsigned. As a result, we write EOF marker [-1, -1] at the end of spill
partition, but deserialize chars as [255, 255].



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