[HDFS-5704] Change OP_UPDATE_BLOCKS with a new OP_ADD_BLOCK

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 2.3.0
• Component/s: namenode
• Hadoop Flags: Reviewed
• Release Note: Add a new editlog record (OP_ADD_BLOCK) that only records allocation of the new block instead of the entire block list, on every block allocation.
• Assignee: Jing Zhao
• Reporter: Suresh Srinivas
• Created: 29/Dec/13 07:35
• Updated: 03/Sep/14 23:34
• Resolved: 15/Jan/14 19:29

Description

Currently every time a block a allocated, the entire list of blocks are written in the editlog in OP_UPDATE_BLOCKS operation. This has n^2 growth issue. The total size of editlog records for a file with large number of blocks could be huge.

The goal of this jira is discuss adding a different editlog record that only records allocation of block and not the entire block list, on every block allocation.

Issue Links

• requires: HDFS-5777 Update LayoutVersion for the new editlog op OP_ADD_BLOCK