LiFu He created KUDU-3011:
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Summary: Support for smooth maintenance window
Key: KUDU-3011
URL: https://issues.apache.org/jira/browse/KUDU-3011
Project: Kudu
Issue Type: New Feature
Reporter: LiFu He
A scan corresponding to a tablet failure causes the entire SQL to fail on the
common query engines, such as Impala. Though we have the fault-tolerant feature
by "SetFaultTolerant()", Impala doesn't use it right now since that will make
lower throughput. Thus, lots of SQL that are running will fail when we
shutdown/reboot/upgrade the tserver. That can be scary.
Maybe we can do some improvement in this area, for example, the tablets are not
allowed to be scanned after the tserver is in maintenance mode (KUDU-2069). And
for the LEADER_ONLY mode scanning, the leader role needs to be shifted from the
maintenance tserver. Then we can shutdown the tserver smoothly after all the
existing SQL are completed.
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