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From "Kihwal Lee (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7603) The background replication queue initialization may not let others run
Date Wed, 14 Jan 2015 15:30:35 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7603?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14277062#comment-14277062
] 

Kihwal Lee commented on HDFS-7603:
----------------------------------

The test failure is unrelated, but looks bad. Bus errors usually happen with a library mix-up.


{noformat}
Results :
Tests run: 2428, Failures: 0, Errors: 0, Skipped: 13

...

Running org.apache.hadoop.hdfs.qjournal.client.TestQJMWithFaults
#
# A fatal error has been detected by the Java Runtime Environment:
#
#  SIGBUS (0x7) at pc=0x00007f8447de9982, pid=3045, tid=140206235416320
#
# JRE version: Java(TM) SE Runtime Environment (7.0_55-b13) (build 1.7.0_55-b13)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (24.55-b03 mixed mode linux-amd64 compressed
oops)
# Problematic frame:
# C  [libzip.so+0x4982]  newEntry+0x62
#
# Failed to write core dump. Core dumps have been disabled. To enable core dumping, try "ulimit
-c unlimited" before starting Java again
#
# An error report file with more information is saved as:
# /home/jenkins/jenkins-slave/workspace/PreCommit-HDFS-Build@2/hadoop-hdfs-project/hadoop-hdfs/hs_err_pid3045.log
Compiled method (nm)  119738   46     n       java.util.zip.ZipFile::getEntry (native)
 total in heap  [0x00007f8444e5b450,0x00007f8444e5b7e8] = 920
 relocation     [0x00007f8444e5b570,0x00007f8444e5b5d0] = 96
 main code      [0x00007f8444e5b5e0,0x00007f8444e5b7e8] = 520
#
# If you would like to submit a bug report, please visit:
#   http://bugreport.sun.com/bugreport/crash.jsp
# The crash happened outside the Java Virtual Machine in native code.
# See problematic frame for where to report the bug.
#
Aborted
{noformat}


> The background replication queue initialization may not let others run
> ----------------------------------------------------------------------
>
>                 Key: HDFS-7603
>                 URL: https://issues.apache.org/jira/browse/HDFS-7603
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: rolling upgrades
>            Reporter: Kihwal Lee
>            Assignee: Kihwal Lee
>            Priority: Critical
>         Attachments: HDFS-7603.patch
>
>
> The background replication queue initialization processes configured number of blocks
at a time and releases the namesystem write lock.  This was to let namenode start serving
right after a standby to active transition or leaving safe mode.  However, this does not allow
others to run much if the lock fairness is set to "unfair" for the higher throughput.
> I propose adding a delay between unlocking and locking in the async repl queue init thread.



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