[HDFS-9917] IBR accumulate more objects when SNN was down for sometime.

• Type: Bug
• Status: Closed
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: 2.7.2
• Fix Version/s: 2.8.0, 2.7.3, 3.0.0-alpha1
• Target Version/s: 2.7.3
• Hadoop Flags: Reviewed
• Assignee: Brahma Reddy Battula
• Reporter: Brahma Reddy Battula
• Created: 08/Mar/16 03:33
• Updated: 06/Jan/17 00:57
• Resolved: 05/Apr/16 02:01

Description

SNN was down for sometime because of some reasons..After restarting SNN,it became unreponsive because

• 29 DN's sending IBR in each 5 million ( most of them are delete IBRs), where as each datanode had only ~2.5 million blocks.
• GC can't trigger on this objects since all will be under RPC queue.

To recover this( to clear this objects) ,restarted all the DN's one by one..This issue happened in 2.4.1 where split of blockreport was not available.