On Mar 23, 2010, at 8:22pm, Mohit Anchlia wrote:
How can I enable wire logging such that it gets logged only when this
problem occurs? Is there a way?
I don't think so.
And you actually want the logs from right _before_ the problem occurs,
as that's when you'll see things like the time of the last request
made that succeeded.
-- Ken
On Tue, Mar 23, 2010 at 4:01 PM, Ken Krugler
<[email protected]> wrote:
I haven't used HttpClient 3.1 for a while now, so I'm not up on the
typical
connection management problems.
I don't think that two threads will share the same connection. If
the server
happens to close a connection in between requests, and the
connection is
being reused (which is typical) then socket exceptions can and do
happen.
E.g. if somebody tweaked the server config to reduce the keep-alive
time,
then you'd start seeing an increased number of these.
You could turn on wire logging, and try to capture a trace of what
happens
during one of these exceptions.
-- Ken
PS - With HC 4.0, all of my connection management issues were my
fault, in
the end :)
On Mar 23, 2010, at 3:20pm, Mohit Anchlia wrote:
We are using httpclient in tomcat. We do several requests per sec.
Recently we started to see increasing number of "reset" execptions.
For some reason I am starting to think that it could be because of
how
HttpClient is handling "closeIdleConnections". It looks like there
could be a timing issue. For eg: Request A got connect x1 but some
other thread that executed closeIdleConnections got rid of x1. Now
when Request A tried to execute x1 it got reset. Has anyone seen any
such problem before? Only other option would be to grab netstat and
tcpdump as a last resort.
----
java.net.SocketException: Connection reset
at java.net.SocketInputStream.read(SocketInputStream.java:168)
at java.io.BufferedInputStream.fill(BufferedInputStream.java:
218)
at java.io.BufferedInputStream.read(BufferedInputStream.java:
235)
at
org.apache.commons.httpclient.HttpParser.readRawLine(Unknown
Source)
at org.apache.commons.httpclient.HttpParser.readLine(Unknown
Source)
at
org.apache.commons.httpclient.HttpConnection.readLine(Unknown
Source)
at
org.apache.commons.httpclient.MultiThreadedHttpConnectionManager
$HttpConnectionAdapter.readLine(Unknown
Source)
at
org.apache.commons.httpclient.HttpMethodBase.readStatusLine(Unknown
Source)
at
org.apache.commons.httpclient.HttpMethodBase.readResponse(Unknown
Source)
at
org.apache.commons.httpclient.HttpMethodBase.execute(Unknown
Source)
at
org
.apache
.commons.httpclient.HttpMethodDirector.executeWithRetry(Unknown
Source)
at
org
.apache.commons.httpclient.HttpMethodDirector.executeMethod(Unknown
Source)
at
org.apache.commons.httpclient.HttpClient.executeMethod(Unknown
Source)
at
org.apache.commons.httpclient.HttpClient.executeMethod(Unknown
Source)
---
On server side we don't see such a request coming in.
Which I think is expected, if the server has closed the connection
and
that's why you're getting this exception.
Server side seem
to have enough capacity
I'd check the keep-alive settings for the server.
and these errors have occurred even during non
busy hours. I am suspecting something to do with how keep alive is
being handled.
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