14. Validating Your Data

Verify that your data is intact by comparing the HDFS data directory tree with the HDP 1.3 or HDP 2.0 tree.

Run the following command to open a command prompt with the HDFS user in the Hadoop Home directory:
```
runas /user:hadoop "cmd /K cd %HDFS_HOME%\bin"
```
Run an lsr report on your upgraded system. Execute the following command from the Hadoop command line:
```
hadoop fs -lsr / > dfs-new-lsr-1.log    
```
Compare the directory listing to the older HDP directories. All old directories, files and timestamps should match. There will be some new entries in the HDP directory listing:
- /apps/hbase is only in HDP and is used by HBase (new when upgrading from 1.3 to 2.1)
- /mapred/system/jobtracker will have a new timestamp
Run a fsck report on your upgraded system. Execute the following command from the Hadoop Command Line:
```
hdfs fsck / -blocks -locations -files fsck-new-report-1.log
```
Compare this fsck report to the prior to upgrade report to check the validity of your current HDFS data.