On 7/22/16 12:23 PM, Kun Ren wrote:
Thanks a lot for your reply, Daniel, very helpful.
About (1) : I will consider this way, thanks. Also beside multiple
clusters, are there any other options to do so? Thanks.
HDFS does not support two active NNs in a single cluster. Each DN
belongs to a single NN, so a federated cluster is really multiple
clusters that are stitched together at the NNs.
About (2), if I understand correctly, HDFS used the quorum journal
manager(QJM) for HA, and the client still only communicates with the
active namenode, not both node, am I understanding right?
I might be confusing HDFS with YARN, but I thought the way the client
found the active NN was by just trying them all until one responds.
Daniel
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