Does using Standby Masters with ZooKeeper with hadoop prevent single point of failure

In hadoop namenodes are a single point of failure. If you use a spark along side hadoop does Zookeeper take care of the single point of failure hadoop would normally have on its own? Or does it still rely on the namenode for the hdfs input

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Link to original article：https://stackoverflow.com/questions/28287201/does-using-standby-masters-with-zookeeper-with-hadoop-prevent-single-point-of-fa