Forgive the top-post.
The reason why this particular case of an extremely slow Manager upload
sticks out is because we've done, by now, hundreds of uploads of this
same WAR file (or earlier versions of it), via Manager, on over a dozen
different installations, most of them AS/400s, and none of the others
have taken even half this long.
On 7/6/18, 12:54 AM, André Warnier (tomcat) wrote:
- when a browser POSTs a file, the content is first Base64-encoded,
which typically increases the size in bytes by some 30-50%. Of
course the receiving server has to Base64-decode the received data,
to restore the original file.
- it is not unusual for encoding/decoding code to process all the
data in memory, as a block. This is usually the fastest way, until
some treshold is reached where the data does not fit anymore in
memory all at once. And then there can be a sudden dramatic slowdown,
as either there is some frantic allocation of additional memory, or
swapping taking place. You might want to have a look at tomcat's JVM
garbage collection statistics while such an upload is going on.
- also, whatever is POSTed to a webserver, is usually first
accumulated somewhere, until the POST is complete. And then the whole
POST is processed, parsed into parts, decoded if need be, and made
available to the web application.
- if this all happens via HTTP, it is also quite possible that there
is some firewall/virus scanning going on, which would add another
round of decoding and examining the POSTed data, which may also be
quite sensitive to the size of things.
What I mean is that there is a lot more going on behind the scenes,
as compared to a simple file transfer via FTP or so. And if each step
introduce some additional overhead depending on the original POST
size, you may have something that looks exponentially (or
asymptotically) worse in the end. Like 10 MB = 10s., 40 MB = 40s., 50
MB = 50s., 51 MB = 10 minutes.
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