[KUDU-1847] kudu-tserver should remove itself from raft-peer-config when met tablet corruption

• Type: Bug
• Status: Resolved
• Priority: Critical
• Resolution: Invalid
• Affects Version/s: 1.0.0
• Fix Version/s: 1.0.0
• Component/s: cfile, consensus
• Assignee: Unassigned
• Reporter: zhangsong
• Created: 24/Jan/17 09:57
• Updated: 25/Jan/17 17:31
• Resolved: 25/Jan/17 09:39

Description

problem found:
Today one of my tables became unwritable. From kudu-master , i found there is only one "FOLLOWER" left in raft-config of a tablet.
After searching kudu-tserver.LOG i found error logs like this
"I0124 03:29:16.000665 17144 raft_consensus.cc:380] T 8870bca7167f46c88099fb3236477530 P 1fa77467172b4ed7ba1a0a10e3dd67f8 [term 173317 FOLLOWER]: Starting election with config: opid_index: 572616 local: false peers { permanent_uuid: "69947ffe22e245afb579287073c58dc2" member_type: VOTER last_known_addr

{ host: "peer_ip" port: 7050 }

} peers { permanent_uuid: "1fa77467172b4ed7ba1a0a10e3dd67f8" member_type: VOTER last_known_addr

{ host: "localhost" port: 7050 }

}
I0124 03:29:16.001211 17144 leader_election.cc:223] T 8870bca7167f46c88099fb3236477530 P 1fa77467172b4ed7ba1a0a10e3dd67f8 [CANDIDATE]: Term 173317 election: Requesting vote from peer 69947ffe22e245afb579287073c58dc2
W0124 03:29:16.001549 15548 leader_election.cc:281] T 8870bca7167f46c88099fb3236477530 P 1fa77467172b4ed7ba1a0a10e3dd67f8 [CANDIDATE]: Term 173317 election: Tablet error from VoteRequest() call to peer 69947ffe22e245afb579287073c58dc2: Illegal state: Tablet not RUNNING: FAILED: Not found: Can't find block: 0000000318394411
I0124 03:29:16.001845 15548 leader_election.cc:248] T 8870bca7167f46c88099fb3236477530 P 1fa77467172b4ed7ba1a0a10e3dd67f8 [CANDIDATE]: Term 173317 election: Election decided. Result: candidate lost.
"
This logs indicate that the current follower(f1) of the tablet start leader election( after election timeout ), and found tablet on another follower(f2) is not running (corruption) . So the election failed.
at the end only one follower of the tablet is alive.
I also found the tablet of f2 has been corrupted for a several days.

Hence i think this is a bug that we lack logic to remove a peer from RaftConfig when the tablet's data of the peer is corrupted.