Thanks a lot for your suggestions. On Fri, Jul 22, 2016 at 3:58 PM, Daniel Templeton <dan...@cloudera.com> wrote:
> 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 >
