Details
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Bug
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Status: Resolved
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Critical
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Resolution: Fixed
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2.4.2
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None
Description
In org.apache.ambari.server.state.services.AlertNoticeDispatchService, we have below code snippet:
... protected void runOneIteration() throws Exception { … String targetType = target.getNotificationType(); NotificationDispatcher dispatcher = m_dispatchFactory.getDispatcher(targetType); … if (dispatcher.isDigestSupported()) { ...
If the database has a change to AlertTargetEntity's targetType column (unlikely but let's assume it happened), then dispatcher can be null and the subsequent if clause will throw an exception. In https://github.com/google/guava/blob/master/guava/src/com/google/common/util/concurrent/AbstractScheduledService.java, we see that the exception may happen silently since shutDown() and notifyFailed() does not log anything.
...
class Task implements Runnable { @Override public void run() { lock.lock(); try { if (runningTask.isCancelled()) { // task may have been cancelled while blocked on the lock. return; } AbstractScheduledService.this.runOneIteration(); } catch (Throwable t) { try { shutDown(); } catch (Exception ignored) { logger.log(Level.WARNING, "Error while attempting to shut down the service after failure.", ignored); } notifyFailed(t); runningTask.cancel(false); // prevent future invocations. } finally { lock.unlock(); } } } }
So, runOneIteration will shutdown the scheduler if it hits an uncaught exception. We should wrap a try/catch.
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