Bharat Viswanadham created HDDS-121:
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Summary: Issue with change of configuration ozone.metastore.impl
in SCM
Key: HDDS-121
URL: https://issues.apache.org/jira/browse/HDDS-121
Project: Hadoop Distributed Data Store
Issue Type: Bug
Reporter: Bharat Viswanadham
BTake 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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