[HDFS-16504] Add parameter for NameNode to process getBloks request

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 3.4.0
• Fix Version/s: 3.4.0
• Component/s: balancer & mover, namanode
• Labels: pull-request-available
• Hadoop Flags: Reviewed
• Assignee: Max Xie
• Reporter: Max Xie
• Created: 14/Mar/22 02:57
• Updated: 11/Oct/22 09:07
• Resolved: 20/Mar/22 06:21

Description

HDFS-13183  add a nice feature that Standby NameNode can process getBlocks request to reduce Active load.  Namenode must set  `dfs.ha.allow.stale.reads = true` to enable this feature. However, if we  set `dfs.ha.allow.stale.reads = true`, Standby Namenode will be able to  process all read requests, which may lead to yarn jobs fail  because  Standby Namenode is stale . 

Maybe we should add a config `dfs.namenode.get-blocks.check.operation=false` for namenode to disable check operation  when namenode process getBlocks request.

Issue Links

• is related to: HDFS-13183 Standby NameNode process getBlocks request to reduce Active load
• links to: GitHub Pull Request #4068