[HBASE-22410] add the notion of the expected # of servers for non-fixed server sets; report an alternative dead server metric

• Type: Improvement
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Component/s: Operability
• Assignee: Sergey Shelukhin
• Reporter: Sergey Shelukhin
• Created: 13/May/19 23:53
• Updated: 23/Jul/19 14:13

Description

dead servers appear to only be cleaned up when a server comes up on the same host and port; however, if HBase is running on smth like YARN with many more hosts than RSes, RS may come up on a different server and the dead one will never be cleaned.
The metric should be improved to account for that... it will potentially require configuring master with expected number of region servers, so that the metric could be output based on that.
Dead server list should also be expired based on timestamp in such cases.

Issue Links

• is a clone of: HBASE-22107 Periodically clean the dead server list
• links to: GitHub Pull Request #238