healthy
framework: start heartbeat
framework: detecdAndReport failures
Merge pull request #81 from go-distributed/healthy

healthy prototype
util: implement tryOccupyTask
simulate node failure in dummySlave
Merge pull request #87 from go-distributed/healthy

util: implement tryOccupyTask
healthy: add Heartbeat func
move healthy_test to integration/
Merge pull request #88 from fengjingchao/master

healthy: add Heartbeat func
healthy: add DetectFailure func
DetectFailure assume all health keys are setup
differentiate failure from detecting failed task
refactor detectAndReportFailures
Merge pull request #89 from fengjingchao/master

healthy: add DetectFailure func
healthy: add ReportFailure and WaitFailure
panic on unhandled error
Merge pull request #90 from fengjingchao/master

healthy: add ReportFailure and WaitFailure
Merge remote-tracking branch 'upstream/master'