virajjasani opened a new pull request #4064: URL: https://github.com/apache/hadoop/pull/4064
### Description of PR Based on the cluster load, it would be helpful to consider tuning block invalidate limit (dfs.block.invalidate.limit). The only way we can do this without restarting Namenode as of today is by reconfiguring heartbeat interval `Math.max(heartbeatInt*20, blockInvalidateLimit)`, this logic is not straightforward and operators are usually not aware of it (lack of documentation), also updating heartbeat interval is not desired in all the cases. We should provide the ability to alter block invalidation limit without affecting heartbeat interval on the live cluster to adjust some load at Datanode level. We should also take this opportunity to keep (heartbeatInterval * 20) computation logic in a common method. ### How was this patch tested? Locally and with UT. ### For code changes: - [X] Does the title or this PR starts with the corresponding JIRA issue id (e.g. 'HADOOP-17799. Your PR title ...')? -- 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. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
