HDFS Erasuring Coding Block placement policy related reconstruction work not scheduled appropriately

[Rui Gao]

Hi all,

We found out that under RS-DEFAULT-6-3-64k EC policy, if an EC file was witten 
to 5 racks, reconstruction work would be scheduled if
the 6th rack is added. While adding the 7th rack or more racks will not trigger 
reconstruction work. Based on “BlockPlacementPolicyRackFaultTolerant.java”,
EC file should be scheduled to distribute to 9 racks if possible.

May I file a JIRA to address this issue?

Looking forward to your opinions.
Thank you

Gao Rui