update hearbeat thread num = 1 (#1029)
* move updateTaskState into try/catch block in case of exception * fix NPE * using conf.getInt instead of getString * for AbstractZKClient, remove the log, for it will print the same log message in createZNodePath. for AlertDao, correct the spelling. * duplicate * refactor getTaskWorkerGroupId * add friendly log * update hearbeat thread num = 1
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