When you say it usually happens in the morning, after the first usage,
that makes me suspect some kind of firewall rule (or VPN tunnel?) that
closed down from inactivity, and then tries to quickly re-establish
itself when the first TCP/IP packet comes through.
Maybe you could implement some kind of repeating HEAD request (every
10 minutes?) just to keep all the wires warm?
Steve Terrell's comments are also good. Probably better than mine. :-o
yours,
Julius
On 12/4/06, Wittmann Armin (BI) <[EMAIL PROTECTED]> wrote:
Hi
I am using commons-httpclient in a 24x7 environment that
does send simple http-POST-requests with about 7 NameValuePairs.
Unfortunately I get sometimes the following error
java.net.SocketTimeoutException: Read timed out
(see stack trace below)
Worse is that this error cannot be reproduced in development
stage. It does occur mostly after a longer time of inactivity
or under high test load (=some 5 requests per second).
The average load in production is very low (e.g. 1 request per
10 seconds).
Fortunately the server recovers from this phase of malfunction
after some seconds and goes on working well.
Does anybody have the same effects or is it possible that I
am not programming API-conform.
Here is the extract of my code inside the class CommonsHttpClient:
(variables with prefix '_' are field variables in this class initialized
in its
constructor [that reads out some properties from file])
<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
public String sendHttpRequest(int pGetOrPost, NameValuePair
pKeyValuePairs) throws LBSystemException {
HttpConnectionManager connectionManager = new
SimpleHttpConnectionManager();
connectionManager.setParams(_connectionManagerParams);
HttpClient client = new HttpClient(_clientParams, connectionManager);
client.setHostConfiguration(_hostConfiguration);
HttpMethod method = null;
if (pGetOrPost == 0) {
method = new PostMethod();
((PostMethod) method).setRequestBody(pairs);
} else if (pGetOrPost == 1) {
method = new GetMethod();
method.setQueryString(pairs);
}
method.setPath(_contextPath);
method.setParams(_methodParams);
int statusCode = -1;
boolean failed = false;
try {
statusCode = client.executeMethod(method);
} catch (Exception e) {
failed = true;
throw new MyException(p + "perform http.request failed.", e);
} finally {
try {
if (failed) {
method.abort();
try {
method.releaseConnection();
} catch (Exception e) {
_log.warning(p + "releasing connection after
evaluating http.request failed (failed=" + failed + "):", e);
}
}
} catch (Exception e) {
_log.warning(p + "aborting http.POST after failure raised an
exception:", e);
}
client.setHttpConnectionManager(null);
client = null;
}
}
<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
Notice: I do release the connection only in case of an exception!
We checked with TCPDUMP on the receiving server. It does not not
receive anything in such a error case. This observation is not very
precise since we tried to estimate when it will occur (mostly in the
morning with the first usage).
And now the stacktrace:
Caused by: java.net.SocketTimeoutException: Read timed out
at java.net.SocketInputStream.socketRead0(Native Method)
at java.net.SocketInputStream.read(Unknown Source)
at com.sun.net.ssl.internal.ssl.InputRecord.readFully(Unknown
Source)
at com.sun.net.ssl.internal.ssl.InputRecord.read(Unknown Source)
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.readRecord(Unknown
Source)
at
com.sun.net.ssl.internal.ssl.SSLSocketImpl.readDataRecord(Unknown
Source)
at com.sun.net.ssl.internal.ssl.AppInputStream.read(Unknown
Source)
at java.io.BufferedInputStream.fill(Unknown Source)
at java.io.BufferedInputStream.read(Unknown Source)
at
org.apache.commons.httpclient.HttpParser.readRawLine(HttpParser.java:77)
at
org.apache.commons.httpclient.HttpParser.readLine(HttpParser.java:105)
at
org.apache.commons.httpclient.HttpConnection.readLine(HttpConnection.jav
a:1115)
at
org.apache.commons.httpclient.HttpMethodBase.readStatusLine(HttpMethodBa
se.java:1832)
at
org.apache.commons.httpclient.HttpMethodBase.readResponse(HttpMethodBase
.java:1590)
at
org.apache.commons.httpclient.HttpMethodBase.execute(HttpMethodBase.java
:995)
at
org.apache.commons.httpclient.HttpMethodDirector.executeWithRetry(HttpMe
thodDirector.java:397)
at
org.apache.commons.httpclient.HttpMethodDirector.executeMethod(HttpMetho
dDirector.java:170)
at
org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:3
96)
at
org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:3
24)
at
ch.ethz.id.bi.fw.common.util.http.CommonsHttpClient.sendHttpRequest(Comm
onsHttpClient.java:148)
... 20 more
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yours,
Julius Davies
416-652-0183
http://juliusdavies.ca/
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