[HIVE-19199] ACID: DbTxnManager heartbeat-service needs static sync init

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.1.0
• Fix Version/s: 3.2.0
• Component/s: Transactions
• Labels: Branch3Candidate
• Assignee: Gopal Vijayaraghavan
• Reporter: Gopal Vijayaraghavan
• Created: 13/Apr/18 08:11
• Updated: 31/Jul/18 21:14
• Resolved: 31/Jul/18 21:14

Description

private synchronized void initHeartbeatExecutorService() {
    if (heartbeatExecutorService != null && !heartbeatExecutorService.isShutdown()
        && !heartbeatExecutorService.isTerminated()) {
      return;
    }
...

heartbeatExecutorService is a static field, so this needs class sync, not object sync.