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List:       rhq-users
Subject:    Re: JDK 7u40 bug
From:       Elias Ross <genman () noderunner ! net>
Date:       2013-09-18 15:14:48
Message-ID: CAKsEmEPk0UdqNLcY=Aya3T+qpv+hLLELGq82Ah0q7RZ7a=taOQ () mail ! gmail ! com
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On Wed, Sep 18, 2013 at 7:25 AM, John Sanda <jsanda@redhat.com> wrote:

> I just learned about a NIO bug[1] in the latest JDK 7u40 release that
> could impact RHQ. The storage node makes extensive use of java.nio as does
> the client library used by the RHQ server. Just something of which to be
> aware if you are running on Java 7 u40.
>
>
The file descriptor count would have to be over 64k, which I suppose could
happen, though for that most people would need a much higher ulimit. All
64k would have to be in use, not just created as POSIX says you have to
reuse closed file descriptors.

By the way, it looks like RHQ uses about one socket per connection, and
about 1000 file descriptors (jar files etc.) out of the box.

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<div dir="ltr"><div><br></div>On Wed, Sep 18, 2013 at 7:25 AM, John Sanda <span \
dir="ltr">&lt;<a href="mailto:jsanda@redhat.com" \
target="_blank">jsanda@redhat.com</a>&gt;</span> wrote:<br><div \
class="gmail_extra"><div class="gmail_quote"> <blockquote class="gmail_quote" \
style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div \
style="word-wrap:break-word">I just learned about a NIO bug[1] in the latest JDK 7u40 \
release that could impact RHQ. The storage node makes extensive use of java.nio as \
does the client library used by the RHQ server. Just something of which to be aware \
if you are running on Java 7 u40.<div> \
<br></div></div></blockquote><div><br></div><div>The file descriptor count would have \
to be over 64k, which I suppose could happen, though for that most people would need \
a much higher ulimit. All 64k would have to be in use, not just created as POSIX says \
you have to reuse closed file descriptors.<br> </div><div><br></div><div>By the way, \
it looks like RHQ uses about one socket per connection, and about 1000 file \
descriptors (jar files etc.) out of the box.</div></div></div></div>


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