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org.apache.hadoop.hbase.ZooKeeperConnectionException: HBase is able to connectto ZooKeeper but the connection closes immediately.
This could be a sign that the server has too many connections (30 is thedefault). Consider inspecting your ZK server logs for that error and
then make sure you are reusing HBaseConfiguration as often as you can. SeeHTable‘s javadoc for more information. at org.apache.hadoop.
hbase.zookeeper.ZooKeeperWatcher.