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From "Daryn Sharp (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-10146) Workaround JDK7 Process fd close bug
Date Wed, 15 Jan 2014 19:19:22 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-10146?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Daryn Sharp updated HADOOP-10146:
---------------------------------

    Attachment: HADOOP-10146.patch
                HADOOP-10146.branch-23.patch

Added comments based on info provided by Steve.  Will commit when pre-commit passes unless
there's objections to the comments.

Note: the original patch filenames had the wrong jira...

> Workaround JDK7 Process fd close bug
> ------------------------------------
>
>                 Key: HADOOP-10146
>                 URL: https://issues.apache.org/jira/browse/HADOOP-10146
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: util
>    Affects Versions: 0.23.0, 2.0.0-alpha, 3.0.0
>            Reporter: Daryn Sharp
>            Assignee: Daryn Sharp
>            Priority: Critical
>         Attachments: HADOOP-10129.branch-23.patch, HADOOP-10129.patch, HADOOP-10146.branch-23.patch,
HADOOP-10146.patch
>
>
> JDK7's {{Process}} output streams have an async fd-close race bug.  This manifests as
commands run via o.a.h.u.Shell causing threads to hang, OOM, or cause other bizarre behavior.
 The NM is likely to encounter the bug under heavy load.
> Specifically, {{ProcessBuilder}}'s {{UNIXProcess}} starts a thread to reap the process
and drain stdout/stderr to avoid a lingering zombie process.  A race occurs if the thread
using the stream closes it, the underlying fd is recycled/reopened, while the reaper is draining
it.  {{ProcessPipeInputStream.drainInputStream}}'s will OOM allocating an array if {{in.available()}}
returns a huge number, or may wreak havoc by incorrectly draining the fd.



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