[HDFS-12853] Ozone: Optimize chunk writes for Ratis by avoiding double writes

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: HDFS-7240
• Fix Version/s: HDFS-7240
• Component/s: ozone
• Target Version/s: HDFS-7240
• Hadoop Flags: Reviewed
• Assignee: Mukul Kumar Singh
• Reporter: Mukul Kumar Singh
• Created: 22/Nov/17 08:40
• Updated: 26/Apr/18 21:56
• Resolved: 09/Jan/18 04:32

Description

Ozone, in replicated mode writes the data twice, once to the raft log and then to the statemachine.
This results in the data being written twice during a particular chunk write, this is subobtimal. With RATIS-122 the statemachine in Ozone can be optimized by writing the data to the statemachine only once.

Issue Links

• breaks: HDFS-13012 TestOzoneConfigurationFields fails due to missing configs in ozone-default.xml