I have totally 10 nodes. 3 nodes are running Zookeeper, the rest 7 nodes are running HDFS and Hbase. And Hbase has stored many data. I initialized Zookeeper nodes by mistake(I'm using Cloudera, by mistake clicked the Initialize Button). I'd like to know did those 3 Zookeeper nodes lost the persistent data which might be Hbase mata data. Or say, Hbase store Meta data in Hmaster while Zookeeper just store some memory data.
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1 Answers
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HBase stores all metadata in special meta table but not in Zookeeper. Zookeeper is used only for coordination and transient operations.
From this article in Cloudera blog:
In Apache HBase, ZooKeeper coordinates, communicates, and shares state between the Masters and RegionServers. HBase has a design policy of using ZooKeeper only for transient data (that is, for coordination and state communication). Thus if the HBase’s ZooKeeper data is removed, only the transient operations are affected — data can continue to be written and read to/from HBase.
So everything should be OK.
