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From "Colin Patrick McCabe (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-8648) libhadoop: native CRC32 validation crashes when blocksize=1
Date Fri, 03 Aug 2012 19:43:02 GMT
Colin Patrick McCabe created HADOOP-8648:
--------------------------------------------

             Summary: libhadoop:  native CRC32 validation crashes when blocksize=1
                 Key: HADOOP-8648
                 URL: https://issues.apache.org/jira/browse/HADOOP-8648
             Project: Hadoop Common
          Issue Type: Bug
    Affects Versions: 2.0.0-alpha
            Reporter: Colin Patrick McCabe
            Assignee: Colin Patrick McCabe


The native CRC32 code, found in {{pipelined_crc32c}}, crashes when blocksize is set to 1.

{code}
12:27:14,886  INFO NativeCodeLoader:50 - Loaded the native-hadoop library
#
# A fatal error has been detected by the Java Runtime Environment:
#
#  SIGSEGV (0xb) at pc=0x00007fa00ee5a340, pid=24100, tid=140326058854144
#
# JRE version: 6.0_29-b11
# Java VM: Java HotSpot(TM) 64-Bit Server VM (20.4-b02 mixed mode linux-amd64 compressed oops)
# Problematic frame:
# C  [libhadoop.so.1.0.0+0x8340]  pipelined_crc32c+0xa0
#
# An error report file with more information is saved as:
# /h/hs_err_pid24100.log
#
# If you would like to submit a bug report, please visit:
#   http://java.sun.com/webapps/bugreport/crash.jsp
#
Aborted
{code}

The Java CRC code works fine in this case.

Choosing blocksize=1 is a __very__ odd choice.  It means that we're storing a 4-byte checksum
for every byte. 
{code}
-rw-r--r--  1 cmccabe users  49398 Aug  3 11:33 blk_4702510289566780538
-rw-r--r--  1 cmccabe users 197599 Aug  3 11:33 blk_4702510289566780538_1199.meta
{code}

However, obviously crashing is never the right thing to do.

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