Problem: filesystemversionexception: you have version null and I want version 8

Problem description ：
First installation HBase success , Use and hbase shell After some command line operations , It is found that the data storage directory is set in the configuration, but the corresponding path is not created locally , close HBase start-up HBase, Create the corresponding location , Problems arise ！

 Looking for problems ：
1、 start-up hbase success , And HMaster And HRegionServer Successful launch , as follows ：

[[email protected] hadoop-2.8.1]# jps
3136 NameNode
106355 QuorumPeerMain
3990 SecondaryNameNode
3496 DataNode
121672 HMaster
122875 Jps
121933 HRegionServer
4957 ResourceManager

2、 Get into hbase shell
 Use list_namepace test , Problems arise , Do not display the normal database .

3、 Find the reason yourself ,jps View in progress HMaster Hang up , only HRegionServer process .

4、 stay  hbase  Installation directory logs In the catalog  hbase-root-master-hadoop.log  The log file error information is as follows ：

2022-07-19 17:58:26,358 FATAL [hadoop:16000.activeMasterManager] master.HMaster: Unhandled exception. Starting shutdown.
org.apache.hadoop.hbase.util.FileSystemVersionException: HBase file layout needs to be upgraded. You have version null and I want version 8. Consult http://hbase.apache.org/book.html for further information about upgrading HBase. Is your hbase.rootdir valid? If so, you may need to run 'hbase hbck -fixVersionFile'.
at org.apache.hadoop.hbase.util.FSUtils.checkVersion(FSUtils.java:678)
at org.apache.hadoop.hbase.master.MasterFileSystem.checkRootDir(MasterFileSystem.java:462)
at org.apache.hadoop.hbase.master.MasterFileSystem.createInitialFileSystemLayout(MasterFileSystem.java:153)
at org.apache.hadoop.hbase.master.MasterFileSystem.<init>(MasterFileSystem.java:128)
at org.apache.hadoop.hbase.master.HMaster.finishActiveMasterInitialization(HMaster.java:638)
at org.apache.hadoop.hbase.master.HMaster.access$500(HMaster.java:184)
at org.apache.hadoop.hbase.master.HMaster$1.run(HMaster.java:1729)
at java.lang.Thread.run(Thread.java:748)

5、 The log shows HBase file layout needs to be upgraded, The file system actually requires upgrading , This is very unscientific . Follow his prompts to run you may need to run 'hbase hbck -fixVersionFile', Still report a mistake .
 See the hint ：You have version null... 

6、 see HDFS File on 
 Directory before problem solving ：
[[email protected] logs]# hdfs dfs -ls /hbase
Found 3 items
drwxr-xr-x   - root supergroup          0 2022-07-19 19:30 /hbase/.tmp
drwxr-xr-x   - root supergroup          0 2022-07-19 17:06 /hbase/MasterProcWALs
drwxr-xr-x   - root supergroup          0 2022-07-19 17:08 /hbase/data
 The directory after the problem is solved ：
[[email protected] ~]# hdfs dfs -ls /hbase
Found 7 items
drwxr-xr-x   - root supergroup          0 2022-07-19 19:37 /hbase/.tmp
drwxr-xr-x   - root supergroup          0 2022-07-19 19:38 /hbase/MasterProcWALs
drwxr-xr-x   - root supergroup          0 2022-07-19 19:37 /hbase/WALs
drwxr-xr-x   - root supergroup          0 2022-07-19 19:37 /hbase/data
-rw-r--r--   1 root supergroup         42 2022-07-19 19:37 /hbase/hbase.id
-rw-r--r--   1 root supergroup          7 2022-07-19 19:37 /hbase/hbase.version
drwxr-xr-x   - root supergroup          0 2022-07-19 19:57 /hbase/oldWALs

 Question why ：
7、 This main file is missing /hbase/hbase.version

 resolvent ：
1、 Delete or remove the damaged file , I suggest the following methods （ If there are still problems , It can also guarantee to restore the original file ）
[[email protected] hadoop-2.8.1]# hdfs dfs -mv /hbase /hbase.bk

2、 Confirm to kill Hbase Of HRegionServer process （HMaster This is because the problem did not appear ）
kill -9 xxxx  (xxxx For process number )

3、 Restart HBase
[[email protected] hadoop-2.8.1]# start-hbase.sh 
[[email protected] hadoop-2.8.1]# jps
3136 NameNode
106355 QuorumPeerMain
3990 SecondaryNameNode
122742 Jps
3496 DataNode
121672 HMaster
121933 HRegionServer
4957 ResourceManager

4、 It can be said that the problem has been solved ？（ Just restart HBase, But if there is data before, it will be lost , Therefore, the following steps should be carried out ） If there is no data or beginners , You can end this step .

5、 Above mentioned 1 Step mentioned , Data not deleted , Just as a backup file , Then recover .


hdfs df -cp /hbase/hbase.version /hbase.bk/

hdfs dfs -rmr /hbase 

hdfs dfs -mv /hbase.bk /hbase

 And then restart again HBase that will do ,Hbase Start splitting hlogs, Data can be recovered