[KUDU-689] scanners awaiting safe time block handlers and block shutdown

• Type: Bug
• Status: Resolved
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: Private Beta
• Component/s: tserver
• Target Version/s: Public beta
• Code Review: http://gerrit.sjc.cloudera.com:8080/?l=283#/c/7814/
• Assignee: Todd Lipcon
• Reporter: Todd Lipcon
• Created: 02/Apr/15 18:24
• Updated: 29/Feb/16 09:11
• Resolved: 09/Sep/15 19:25

Description

Currently, if you request a READ_AT_SNAPSHOT scanner in the future, the scanner can block in WaitForCleanSnapshotAtTimestamp for a long time. This seems to cause occasional timeouts in ClientTest.TestScanFaultTolerance, because we also don't handle the case where we try to shut down a TS while there is a scanner waiting.

Issue Links

• relates to: KUDU-987 Follower tablets with transactions in REPLICATING state cannot be tombstoned