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From "Ruslan Al-Fakikh (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-10436) ToolRunner is not thread-safe
Date Tue, 09 Sep 2014 11:10:28 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-10436?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14126880#comment-14126880

Ruslan Al-Fakikh commented on HADOOP-10436:

The issue is resolved in a newer version of CLI:
So, OptionBuilder is deprecated there. I think we just need to use the new Option.Builder
from here:

> ToolRunner is not thread-safe
> -----------------------------
>                 Key: HADOOP-10436
>                 URL: https://issues.apache.org/jira/browse/HADOOP-10436
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: util
>            Reporter: Ajay Chitre
>            Assignee: Tsuyoshi OZAWA
>         Attachments: HADOOP-10436.1.patch
> ToolRunner class is not thread-safe because it uses GenericOptionsParser.  The constructor
of GenericOptionsParser uses 'OptionBuilder' which is a singleton class that uses instance
variables.  In other words, OptionBuilder is NOT thread safe.  As a result, when multiple
Hadoop jobs are triggered simultaneously using ToolRunner they end up stepping on each other.
> The easiest way to fix it is by making 'buildGeneralOptions' synchronized in GenericOptionsParser.
> private static synchronized Options buildGeneralOptions(Options opts) {
> If this seems like the correct way of fixing this, either we can provide a patch or someone
can quickly fix it.  Thanks.
> Ajay Chitre
> achitre@cisco.com
> Virendra Singh
> virsingh@cisco.com

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