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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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Bharat Viswanadham updated HDDS-122:
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Description:
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 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.
was:
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.
> 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
> 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 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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