[HDFS-13880] Add mechanism to allow certain RPC calls to bypass sync

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: HDFS-12943, 3.3.0
• Component/s: namenode
• Assignee: Chen Liang
• Reporter: Chen Liang
• Created: 28/Aug/18 21:12
• Updated: 24/Dec/18 18:29
• Resolved: 13/Sep/18 23:24

Description

Currently, every single call to NameNode will be synced, in the sense that NameNode will not process it until state id catches up. But in certain cases, we would like to bypass this check and allow the call to return immediately, even when the server id is not up to date. One case could be the to-be-added new API in HDFS-13749 that request for current state id. Others may include calls that do not promise real time responses such as getContentSummary. This Jira is to add the mechanism to allow certain calls to bypass sync.

Issue Links

• duplicates: HDFS-13872 Only some protocol methods should perform msync wait