if you are using keep alive connections, (Tomcat default config)
then once a request is done, the system goes into reading the next
request, and that is done by calling parseRequestLine, so this is not a
bottleneck, but expected behavior.
if you switch to the NIO connector, that doesn't do block reading during
a keep alive, your numbers would show differently. however, the perf
numbers you are looking at are no cause for concern
Filip
Caldarale, Charles R wrote:
From: Christophe Fondacci
[mailto:[EMAIL PROTECTED]
Subject: Tomcat bottleneck on InternalInputBuffer.parseRequestLine
This problem may be related to the one listed here :
http://grokbase.com/profile/id:hNxqA0ZEdnD-6GYFRNs-iIkKEvF907F
NWdczKYQ719Q
I would have my doubts about a five-year-old problem description being
pertinent to today's Tomcat.
When the problem occurs, we can see threads which are
stucked with the following call stack :
at java.net.SocketInputStream.socketRead0(Native Method)
at java.net.SocketInputStream.read(SocketInputStream.java:129)
at
org.apache.coyote.http11.InternalInputBuffer.fill
(InternalInputBuffer.java:700)
at
org.apache.coyote.http11.InternalInputBuffer.parseRequestLine
(InternalInputBuffer.java:366)
It looks like the parser is waiting for more of the request to show up. Are
you positive that the stalled requests are well-formed? Is it possible that
there's something not quite thread safe in your client on Server A that might
be corrupting the request stream as it's being generated? Can you run a
Wireshark or equivalent trace and observe one of the slow ones? (That may be
tricky.)
- Chuck
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