我在我的主人＆＃39;当我考虑创建一个新的分支并通过以下方式完成时分支：
$ git checkout -b od_newstructure
Switched to a new branch 'od_newstructure'
我提交了一些更改并将此新分支添加到远程并开始跟踪
$ git commit
$ git branch -u origin/od_newstructure
Branch od_newstructure set up to track remote branch od_newstructure from origin.
$ .. some other work including git pull and git push
我现在想切换回主人。所以我做了
git checkout master
Switched to branch 'master'
然而，师傅似乎不再追踪起源/主人了！
$ git branch -vv
* master d1db2e3 Subdivided into several namespaces
od_newstructure d1db2e3 [origin/od_newstructure] Subdivided into several namespaces
还通过git pull
进行了验证$ git pull
There is no tracking information for the current branch.
Please specify which branch you want to merge with.
See git-pull(1) for details
我的问题是，当我切换到新的跟踪分支时，为什么以前的跟踪分支机构丢失了跟踪信息？这是默认和健全的行为吗？每次切换到跟踪分支时，是否必须按git branch -u添加上游？