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Hi:
We have been developing a site using Apache JServ 1.1b3 on Sun Solaris
2.7 with JVM 1.1.8_09 and Apache 1.3.9. During development we had
apache and JServ on a single box and all worked well.
Now we are going to production with a load balancing. We have Apache
1.3.9 running on 2 Intel Linux boxes running RH6.1.
It seems that any input stream behavior does not work reliably, in
particular POST operations and multi-part form reading.
We see that I/O is acting very differently on the separated setup. It
looks like what is good for the goose is not good for the different
production architecture. Yesterday I made some changes in the
Multipart form implementation to handle the case of the stream not being
available. It turns out that there is something truly different,
I/O-wise, between having Apache/JServ on one box and having them on
separate boxes. In other words one multipart implementation does not
satisfy both scenarios. The change I made to fix the production setup
was bombing out on the development setup. Here is the gist:
On one box ->
1. the input stream always seems to report not ready and no
bytes
available.
2. calls to read() simply work and and return non-zero lengths
until
the end of file is reached. this (I believe) is the way things
are supposed to work.
On 2 boxes ->
1. the input stream correctly reports if it is ready with calls
to ready(). the fix I had was to wait until the stream was ready
before each read.
2. calls to read when the stream was not ready would hang the vm
3. discovery of EOF was due to a wait for a finite amount of
time
without the stream being ready. I.E. read() never returns
negative number.
Any help really appreciated.
Thanks,
-MA
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