guyuqi opened a new pull request, #913:
URL: https://github.com/apache/bigtop/pull/913
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### Description of PR
When uninstalled Hadoop-2.10 and reinstalled Hadoop-3.2, it would fail to
format namenode and The user have to restart NameNode with the "-rollingUpgrade
started" option if a rolling upgrade is already started; or restart NameNode
with the "-upgrade" option to start a new upgrade.
It would confuse some new BIgtop Hadoop users.
It's better to remove deprecated Hadoop fs-image file after uninstalling
HDFS-namenode when uninstalling package.
### How was this patch tested?
Build Hadoop by Bigtop and install/remove Hadoop package.
```
e.g. :
rpm -e hadoop-hdfs-3.2.3-1.el7.x86_64.rpm
or
rpm -qa | grep hadoop | sudo xargs yum -y remove
```
### For code changes:
- [ ] Does the title or this PR starts with the corresponding JIRA issue id
(e.g. 'BIGTOP-3638. Your PR title ...')?
- [ ] Make sure that newly added files do not have any licensing issues.
When in doubt refer to https://www.apache.org/licenses/
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