[RATIS-589] Eliminate buffer copying in SegmentedRaftLogOutputStream

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 3.0.1
• Component/s: server
• Assignee: Tsz-wo Sze
• Reporter: Tsz-wo Sze
• Created: 14/Jun/19 00:57
• Updated: 09/Jan/24 21:19
• Resolved: 16/Nov/23 02:13

Description

In SegmentedRaftLogOutputStream.write(LogEntryProto entry), the entry is first converted to a byte array and then write to BufferedWriteChannel. In BufferedWriteChannel, it copies the byte array to a ByteBuffer. The copying should be eliminated.

Issue Links

• depends upon: RATIS-587 FinalizeLogSegment should flush the contents of log
• is related to: RATIS-1746 Change the shared byte array in SegmentedRaftLogWorker to be configurable.
• relates to: HDDS-9818 Ensure valid Raft log write buffer size
• links to: GitHub Pull Request #964