Jenkins实时控制台输出，用于并行线程结构命令

我们有一个可以在多个主机上并行运行的Python fabric命令，如下所示：

$ fab --hosts=prod1.server,prod2.server,prod3.server --parallel copy_cache

这会将缓存复制到并行列出的生产服务器。在整个过程中会发生各种日志记录，以表明我们的进展情况，因为XXgig缓存目录可能要花费数小时。由于复制是同时进行的，因此在命令行上运行时，输出会实时返回隔行扫描，如下所示：

[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.

但是，当通过Jenkins运行任务时，直到所有任务完成后才显示控制台输出，因为在所有线程完成后，在线程加入后，Jenkins将输出分组。因此，所有命令完成后，输出将如下所示：

[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.

尽管这更具可读性，但它并不理想，因为我们希望通过实时读取控制台输出来跟踪进程状态。请注意，在不带该--parallel选项的情况下运行该结构命令时，控制台输出确实会实时发生，但是显然这是行不通的，因为串行过程需要更长的时间才能运行。

我无法在Jenkins中找到将禁用此线程分组的设置。有人有什么想法吗？