Na Li created SENTRY-2203:
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Summary: Leader Lock is not released when Sentry service shuts down
Key: SENTRY-2203
URL: https://issues.apache.org/jira/browse/SENTRY-2203
Project: Sentry
Issue Type: Bug
Components: Sentry
Affects Versions: 2.1.0
Reporter: Na Li
Assignee: Na Li
In our testing for sentry HA, we found after restarting sentry service without
restarting zookeeper service, it is possible that none of sentry servers is
elected as leader.
What happened was
1) When a leader is elected, the sentry server host holds the leader lock. The
lock is identified by the mutexPath. All sentry servers in a cluster use the
same mutexPath.
2) When sentry service is shutdown, the HAContext is shutdown, so its contained
CuratorFrameworkImpl was shutdown, but the leader lock was still hold by the
sentry server host
3) When the Interruption signal from shutdown caused the leader election thread
to be interrupted, releasing the leader lock failed because
CuratorFrameworkImpl was not in started state.
4) When sentry server restarts, acquiring the leader lock failed because it was
not released. So no active sentry servers is leader.
5) If releasing leader lock happened before CuratorFrameworkImpl was shutdown,
this issue won't happen. If restarting zookeeper after sentry service restart,
this issue won't happen.
To fix this issue,
Sentry LeaderStatusMonitor can deactivate the leader to release the leader lock
when it is closed, so the leader lock can be guaranteed to release before
CuratorFrameworkImpl is shutdown.
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