[HDFS-9261] Erasure Coding: Skip encoding the data cells if all the parity data streamers are failed for the current block group

• Type: Sub-task
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 3.0.0-alpha1
• Hadoop Flags: Reviewed
• Assignee: Rakesh Radhakrishnan
• Reporter: Rakesh Radhakrishnan
• Created: 16/Oct/15 18:17
• Updated: 12/May/16 18:15
• Resolved: 29/Oct/15 07:06

Description

DFSStripedOutputStream will continue writing with minimum number (dataBlockNum) of live datanodes. It won't replace the failed datanodes immediately for the current block group. Consider a case where all the parity data streamers are failed, now it is unnecessary to encode the data block cells and generate the parity data. This is a corner case where it can skip writeParityCells() step.