Zhijie Shen created HADOOP-10794:
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Summary: A hadoop cluster needs clock synchronization
Key: HADOOP-10794
URL: https://issues.apache.org/jira/browse/HADOOP-10794
Project: Hadoop Common
Issue Type: Bug
Reporter: Zhijie Shen
As a distributed system, a hadoop cluster wants the clock on all the
participating hosts synchronized. Otherwise, some problems might happen. For
example, in MAPREDUCE-5940, due to the clock on the host for the task container
falls behind that on the host of the AM container, the computed elapsed time
(the diff between the timestamps produced on two hosts) becomes negative.
In MAPREDUCE-5940, we tried to mask the negative elapsed time. However, we
should seek for a decent long term solution, such as providing mechanism to do
and check clock synchronization.
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