tree 9de3a0ced336806aaad7b421d570d1e5e84d035a
parent 1b5cfb0f0f343926393fcf369ff80132d41cae56
author You-Cheng Syu <youcheng@chromium.org> 1516271395 +0800
committer chrome-bot <chrome-bot@chromium.org> 1516373872 -0800

Umpire: migrate: Avoid re-importing modules.

Currently migrate.py will fork a process and have the child-process run
'python migrate.py -r MIGRATION_ID' to run migration scripts each time.
This is very slow because migrate.py indirectly imports many unused
modules. In this change we re-use the spawned python child-process, this
avoids re-importing those previously imported modules and makes the
migration much faster.

BUG=b:72137389
TEST=manually && ~/cros_docker.sh umpire test

Change-Id: I931650317d088bc7ab1071dde66c0d125509d9d3
Reviewed-on: https://chromium-review.googlesource.com/873251
Commit-Ready: Youcheng Syu <youcheng@chromium.org>
Tested-by: Youcheng Syu <youcheng@chromium.org>
Reviewed-by: Ting Shen <phoenixshen@chromium.org>