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Posted to hdfs-issues@hadoop.apache.org by "Bharat Viswanadham (JIRA)" <ji...@apache.org> on 2018/05/24 23:55:00 UTC
[jira] [Updated] (HDDS-122) Issue with change of configuration
ozone.metastore.impl in KSM
[ https://issues.apache.org/jira/browse/HDDS-122?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Bharat Viswanadham updated HDDS-122:
------------------------------------
Summary: Issue with change of configuration ozone.metastore.impl in KSM (was: Issue with change of configuration ozone.metastore.impl in Ozone Manager)
> 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 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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