sodonnel opened a new pull request #1605: URL: https://github.com/apache/ozone/pull/1605
## What changes were proposed in this pull request? When a datanode is started, it must read some metadata from all the Containers. Part of that metadata is stored in RocksDB, so the startup process involves opening each rocksDB and closing it again. Testing on a dense node, with 45 high performance spinning disks and 200K containers, I saw about 75ms on average to open each RockDB. Further testing demonstrated that if we open RockDB read only, the average open time is about 35ms. At startup time, the DBs are only read, and never written, so opening read only is fine. HDDS-4427 already ensures these opened DBs are not cached. This change adds an "openReadOnly" flag to RDBStore and the related classes to pass it down the stack, allowing the DB to be opened read only. ## What is the link to the Apache JIRA https://issues.apache.org/jira/browse/HDDS-4488 ## How was this patch tested? Currently existing unit tests. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
