[jira] [Created] (HDDS-122) Issue with change of configuration ozone.metastore.impl in Ozone Manager

["Bharat Viswanadham (JIRA)" <ji...@apache.org>]

Bharat Viswanadham created HDDS-122:
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             Summary:  Issue with change of configuration ozone.metastore.impl in Ozone Manager
                 Key: HDDS-122
                 URL: https://issues.apache.org/jira/browse/HDDS-122
             Project: Hadoop Distributed Data Store
          Issue Type: Bug
            Reporter: Bharat Viswanadham


Take a scenario:
 # When we started ozone cluster, I have set ozone.metastore.impl to RocksDB.
 # Later I have stopped ozone cluster. 
 # Changed the configuration of ozone.metastore.impl to LevelDB

Now, when we restart we create SCM container DB, node DB, delete blocks DB with a new db type. With this we will lose all the information.

 

To avoid this kind of scenario, when we start SCM, we need to persist the DB used for SCM into a VersionFile, and use this. In this way with later restarts, if we have a version file, we read the dbType from Version file and use it for metadata store.

 



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