We have a Python fabric command that runs in parallel across several hosts,
something like this:
$ fab --hosts=prod1.server,prod2.server,prod3.server --parallel
copy_cache
This will copy cache to the production servers listed in parallel. There is
various logging that occurs throughout the process to indicate how far
along we are since it can take hours for the XXgig cache directories. Since
the copying is happening concurrently, the output when run on the command
line comes back interlaced in real-time, like so:
[prod1.server] Executing task 'nginx_cache_copy'
[prod2.server] Executing task 'nginx_cache_copy'
[prod3.server] Executing task 'nginx_cache_copy'
2014-09-16 10:02:29.688243
[prod1.server] INFO: rsyncing cache dir
[prod1.server] run: rsync -a -q cache.server:"repo/cache/some.site.com"
\
"repo/cache/."
2014-09-16 10:02:29.716345
[prod2.server] INFO: rsyncing cache dir
[prod2.server] run: rsync -a -q cache.server:"repo/cache/some.site.com"
\
"repo/cache/."
2014-09-16 10:02:29.853275
[prod3.server] INFO: rsyncing cache dir
[prod3.server] run: rsync -a -q cache.server:"repo/cache/some.site.com"
\
"repo/cache/."
2014-09-16 10:02:29.984154
[prod1.server] INFO: Reloading nginx config
[prod1.server] run: sbin/nginx -s reload -c "repo/nginx.conf"
2014-09-16 10:02:30.025155
[prod2.server] INFO: Reloading nginx config
[prod2.server] run: sbin/nginx -s reload -c "repo/nginx.conf"
2014-09-16 10:02:30.100169
[prod1.server] SUCCESS: CACHE COPY COMPLETE
2014-09-16 10:02:30.181938
[prod2.server] SUCCESS: CACHE COPY COMPLETE
2014-09-16 10:02:30.331402
[prod3.server] INFO: Reloading nginx config
[prod3.server] run: sbin/nginx -s reload -c "repo/nginx.conf"
2014-09-16 10:02:30.559271
[prod3.server] SUCCESS: CACHE COPY COMPLETE
Done.
However, when the task is run through Jenkins, the console output does not
display until all tasks are done because Jenkins groups the output AFTER
the threads are joined when all threads are complete. So, once all commands
are complete the output looks like this:
[prod1.server] Executing task 'nginx_cache_copy'
2014-09-16 10:02:29.688243
[prod1.server] INFO: rsyncing cache dir
[prod1.server] run: rsync -a -q cache.server:"repo/cache/some.site.com"
\
"repo/cache/."
2014-09-16 10:02:29.984154
[prod1.server] INFO: Reloading nginx config
[prod1.server] run: sbin/nginx -s reload -c "repo/nginx.conf"
2014-09-16 10:02:30.100169
[prod1.server] SUCCESS: CACHE COPY COMPLETE
[prod2.server] Executing task 'nginx_cache_copy'
2014-09-16 10:02:29.716345
[prod2.server] INFO: rsyncing cache dir
[prod2.server] run: rsync -a -q cache.server:"repo/cache/some.site.com"
\
"repo/cache/."
2014-09-16 10:02:30.025155
[prod2.server] INFO: Reloading nginx config
[prod2.server] run: sbin/nginx -s reload -c "repo/nginx.conf"
2014-09-16 10:02:30.181938
[prod2.server] SUCCESS: CACHE COPY COMPLETE
[prod3.server] Executing task 'nginx_cache_copy'
2014-09-16 10:02:29.853275
[prod3.server] INFO: rsyncing cache dir
[prod3.server] run: rsync -a -q cache.server:"repo/cache/some.site.com"
\
"repo/cache/."
2014-09-16 10:02:30.331402
[prod3.server] INFO: Reloading nginx config
[prod3.server] run: sbin/nginx -s reload -c "repo/nginx.conf"
2014-09-16 10:02:30.559271
[prod3.server] SUCCESS: CACHE COPY COMPLETE
Done.
While this is more readable, it's not ideal because we'd like to keep track
of the state of the process by reading the console output in realtime. Note
that when this fabric command is run *without* the `--parallel` option the
console output *does occur in realtime*, however obviously this is not
workable because the serial process takes much longer to run.
I haven't been able to find a setting in Jenkins that will disable this
thread grouping. Does anyone have any ideas?
Thanks.
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