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https://issues.apache.org/jira/browse/HDDS-122?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hanisha Koneru reopened HDDS-122:
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Sorry [~bharatviswa]. Mis-read the title. Re-opening it.
> Issue with change of configuration ozone.metastore.impl in KSM
> ---------------------------------------------------------------
>
> Key: HDDS-122
> URL: https://issues.apache.org/jira/browse/HDDS-122
> Project: Hadoop Distributed Data Store
> Issue Type: Bug
> Reporter: Bharat Viswanadham
> Assignee: Bharat Viswanadham
> Priority: Major
>
> 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 KSM DB with a new DB type. With this, we will
> lose all the information.
>
> To avoid this kind of scenario, when we start KSM, we need to persist the DB
> used for KSM 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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