A本地修改了某个文件File，B本地也修改了这个文件File，他们都先后git push到了gerrit上，这个时候reviewer无论先进谁的提交，gerrit上另一笔提交的状态都会显示merge conflict，那如何更新这一笔change，而不是Abandon然后再提一个change呢，假设A的提交了先进了，要修改B的change。

  1. 先同步服务器代码
git remote update
  1. rebase
git rebase remote_branch

会出现如下提示：

First, rewinding head to replay your work on top of it...
Applying: your_patch
Using index info to reconstruct a base tree...
M	 your_modified_file
Falling back to patching base and 3-way merge...
Auto-merging your_modified_file
CONFLICT (content): Merge conflict in your_modified_file
Recorded preimage for 'your_modified_file'
Failed to merge in the changes.
Patch failed at 0001 your_patch
The copy of the patch that failed is found in:
   /your_prj_path/.git/rebase-apply/patch

When you have resolved this problem, run "git rebase --continue".
If you prefer to skip this patch, run "git rebase --skip" instead.
To check out the original branch and stop rebasing, run "git rebase --abort".

这个时候git log就能看到A的提交。

git status能看到此时正在rebasing,要你修复冲突后再运行continue rebase:

rebase in progress; onto 5ac5126
You are currently rebasing.
  (fix conflicts and then run "git rebase --continue")
  (use "git rebase --skip" to skip this patch)
  (use "git rebase --abort" to check out the original branch)

Unmerged paths:
  (use "git reset HEAD <file>..." to unstage)
  (use "git add <file>..." to mark resolution)

	both modified:      your_conflict_file

no changes added to commit (use "git add" and/or "git commit -a")
  1. 修改冲突文件

打开冲突文件，能发现A和B的提交都在里面，手动编辑这个文件让他保持A的提交内容，然后再加上B的修改。

  1. mark resolution
git add .

add后会提示冲突修复了。

rebase in progress; onto 5ac5126
You are currently rebasing.
  (all conflicts fixed: run "git rebase --continue")

Changes to be committed:
  (use "git reset HEAD <file>..." to unstage)

	modified:   your_file
  1. 继续rebase
git rebase --continue

成功后会提示：

Applying: your_patch
Recorded resolution for 'your_modified_file'.

再git log方法B的提交在A的后面。

  1. 提交

push后gerrit这一笔提交status的merge conflict已经没有了，History里会显示：

Uploaded patch set 2.

OK, Done.