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Posted to users@tomcat.apache.org by mo...@comcast.net on 2014/10/17 22:51:21 UTC
mod-jk reports errors when downloading files above 4 MB, but runs
fine for smaller file sizes
Hi, I'm using mod-jk (v1.2.40) on CentOS Linux server to pass requests from Apache web server (v2.4.9) to GlassFish (v3.1.2) application server. I'm using a java 7 servlet (shown below) on my application server to enable a client to download a PDF file via HTTPS.
Things work fine when this file size is less than about 4 MB. When the file is larger than 4 MB, I see the following errors in the mod_jk.log file:
[info] init_jk::mod_jk.c (3383): mod_jk/1.2.40 initialized
[error] ajp_connection_tcp_get_message::jk_ajp_common.c (1313): wrong message format 0xcad5 from ::1:8009
[error] ajp_get_reply::jk_ajp_common.c (2204): (worker1) Tomcat is down or network problems. Part of the response has already been sent to the client
[info] ajp_service::jk_ajp_common.c (2673): (worker1) sending request to tomcat failed (recoverable), because of protocol error (attempt=1)
[info] ajp_process_callback::jk_ajp_common.c (2000): Writing to client aborted or client network problems
[info] ajp_service::jk_ajp_common.c (2673): (worker1) sending request to tomcat failed (unrecoverable), because of client write error (attempt=2)
[info] jk_handler::mod_jk.c (2799): Aborting connection for worker=worker1
I'm not an expert here, and wondered if anyone could decode this to find root cause and solution. There are no errors in Apache or GlassFish log files. When I run the client Google Chrome browser (for example), it appears to download the first 4 MB and then report "network error". Other browsers behave similarly. Mod_jk appears to have the only log file reporting an error.
Other miscellaneous thoughts:
1. My server doesn't have a firewall limiting file size.
2. My client router/modem doesn't limit file download size (I download much larger files often).
3. As far as I'm aware, the Java code below doesn't restrict the file size download (can anyone confirm? perhaps mod-jk is complaining about the header or content type?).
4. GlassFish timeout is 15 minutes, and the browser stops downloading after perhaps 10 seconds.
I'm running out of things to check. What could it be? Any help is MUCH appreciated. Thanks.
---------- Java Servlet ----------
public class GetFile extends HttpServlet {
@Override
public void init(ServletConfig config) throws ServletException {
super.init(config);
}
protected void doPost(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException {
String filename ="init_java";
try {
// get user parameters
filename = req.getParameter("fileId"); // complete path to file
//res.setContentType("video/mp4"); //not working
res.setContentType("application/x-download");
File file=new File(filename);
if (file.exists()) {
res.setHeader("Content-Disposition", "inline; filename=\""+filename+"\"");
res.setHeader("Cache-Control", "cache, must-revalidate");
//res.setHeader("Pragma", "public"); // not sure when to use
returnFile(filename, res.getOutputStream());
} else {
//error handling goes here
}
} catch (Exception e) {
...
} finally {
...
}
}
private static void returnFile(String filename, OutputStream out) throws FileNotFoundException, IOException {
InputStream in = null;
try {
in = new BufferedInputStream(new FileInputStream(filename));
byte[] buf = new byte[4 * 1024]; // 4K buffer
int bytesRead;
while ((bytesRead = in.read(buf)) != -1) {
out.write(buf, 0, bytesRead);
}
out.flush();
} finally {
if (in != null) in.close();
}
}
}
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Re: mod-jk reports errors when downloading files above 4 MB, but
runs fine for smaller file sizes
Posted by mo...@comcast.net.
Thanks so much!
----- Original Message -----
From: "Christopher Schultz" <ch...@christopherschultz.net>
To: "Tomcat Users List" <us...@tomcat.apache.org>
Sent: Friday, October 17, 2014 5:01:49 PM
Subject: Re: mod-jk reports errors when downloading files above 4 MB, but runs fine for smaller file sizes
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
To whom it may concern,
On 10/17/14 4:51 PM, modjklist@comcast.net wrote:
> Hi, I'm using mod-jk (v1.2.40) on CentOS Linux server to pass
> requests from Apache web server (v2.4.9) to GlassFish (v3.1.2)
> application server. I'm using a java 7 servlet (shown below) on my
> application server to enable a client to download a PDF file via
> HTTPS.
>
> Things work fine when this file size is less than about 4 MB. When
> the file is larger than 4 MB, I see the following errors in the
> mod_jk.log file:
>
> [info] init_jk::mod_jk.c (3383): mod_jk/1.2.40 initialized [error]
> ajp_connection_tcp_get_message::jk_ajp_common.c (1313): wrong
> message format 0xcad5 from ::1:8009 [error]
> ajp_get_reply::jk_ajp_common.c (2204): (worker1) Tomcat is down or
> network problems. Part of the response has already been sent to the
> client [info] ajp_service::jk_ajp_common.c (2673): (worker1)
> sending request to tomcat failed (recoverable), because of protocol
> error (attempt=1) [info] ajp_process_callback::jk_ajp_common.c
> (2000): Writing to client aborted or client network problems [info]
> ajp_service::jk_ajp_common.c (2673): (worker1) sending request to
> tomcat failed (unrecoverable), because of client write error
> (attempt=2) [info] jk_handler::mod_jk.c (2799): Aborting connection
> for worker=worker1
>
> I'm not an expert here, and wondered if anyone could decode this to
> find root cause and solution. There are no errors in Apache or
> GlassFish log files. When I run the client Google Chrome browser
> (for example), it appears to download the first 4 MB and then
> report "network error". Other browsers behave similarly. Mod_jk
> appears to have the only log file reporting an error.
>
> Other miscellaneous thoughts:
>
> 1. My server doesn't have a firewall limiting file size.
>
> 2. My client router/modem doesn't limit file download size (I
> download much larger files often).
>
> 3. As far as I'm aware, the Java code below doesn't restrict the
> file size download (can anyone confirm? perhaps mod-jk is
> complaining about the header or content type?).
>
> 4. GlassFish timeout is 15 minutes, and the browser stops
> downloading after perhaps 10 seconds.
>
> I'm running out of things to check. What could it be? Any help is
> MUCH appreciated. Thanks.
Looks like it's an old GlassFish bug:
https://java.net/jira/browse/GLASSFISH-18446
and
http://stackoverflow.com/questions/9770529/glassfish-jk-large-file-strange-response
Funny how Googling for "mod_jk message format 0xcad5" can find exactly
what you were looking for.
- -chris
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Re: mod-jk reports errors when downloading files above 4 MB,
but runs fine for smaller file sizes
Posted by Christopher Schultz <ch...@christopherschultz.net>.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
To whom it may concern,
On 10/17/14 4:51 PM, modjklist@comcast.net wrote:
> Hi, I'm using mod-jk (v1.2.40) on CentOS Linux server to pass
> requests from Apache web server (v2.4.9) to GlassFish (v3.1.2)
> application server. I'm using a java 7 servlet (shown below) on my
> application server to enable a client to download a PDF file via
> HTTPS.
>
> Things work fine when this file size is less than about 4 MB. When
> the file is larger than 4 MB, I see the following errors in the
> mod_jk.log file:
>
> [info] init_jk::mod_jk.c (3383): mod_jk/1.2.40 initialized [error]
> ajp_connection_tcp_get_message::jk_ajp_common.c (1313): wrong
> message format 0xcad5 from ::1:8009 [error]
> ajp_get_reply::jk_ajp_common.c (2204): (worker1) Tomcat is down or
> network problems. Part of the response has already been sent to the
> client [info] ajp_service::jk_ajp_common.c (2673): (worker1)
> sending request to tomcat failed (recoverable), because of protocol
> error (attempt=1) [info] ajp_process_callback::jk_ajp_common.c
> (2000): Writing to client aborted or client network problems [info]
> ajp_service::jk_ajp_common.c (2673): (worker1) sending request to
> tomcat failed (unrecoverable), because of client write error
> (attempt=2) [info] jk_handler::mod_jk.c (2799): Aborting connection
> for worker=worker1
>
> I'm not an expert here, and wondered if anyone could decode this to
> find root cause and solution. There are no errors in Apache or
> GlassFish log files. When I run the client Google Chrome browser
> (for example), it appears to download the first 4 MB and then
> report "network error". Other browsers behave similarly. Mod_jk
> appears to have the only log file reporting an error.
>
> Other miscellaneous thoughts:
>
> 1. My server doesn't have a firewall limiting file size.
>
> 2. My client router/modem doesn't limit file download size (I
> download much larger files often).
>
> 3. As far as I'm aware, the Java code below doesn't restrict the
> file size download (can anyone confirm? perhaps mod-jk is
> complaining about the header or content type?).
>
> 4. GlassFish timeout is 15 minutes, and the browser stops
> downloading after perhaps 10 seconds.
>
> I'm running out of things to check. What could it be? Any help is
> MUCH appreciated. Thanks.
Looks like it's an old GlassFish bug:
https://java.net/jira/browse/GLASSFISH-18446
and
http://stackoverflow.com/questions/9770529/glassfish-jk-large-file-strange-response
Funny how Googling for "mod_jk message format 0xcad5" can find exactly
what you were looking for.
- -chris
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