emr - No Impalad available -

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i'm setting hue 3.8.1 point emr

i've received following message check_config:

impala editor   no available impalad send queries to.

i've confirmed impala running on host (the emr master node), , tat connection can made using impyla.

what missing here?

the host , port correctly set

# host of impala server (one of impalad) server_host=192.168.16.231  # port of impala server server_port=21050


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