Is it beneficial to add more hbase servers without adding more hdfs servers?

It depends. As always there are three fundamental bottlenecks.

It depends. As always there are three fundamental bottlenecks: 1) CPU 2) Network I/O 3) Disk I/O If your application is currently CPU bound, or if you data has a high cache hit rate with the extra nodes, then extra HBase nodes are useful. If your application is mostly disk bound, or network bound, then extra HBase nodes wouldn't help much (unless adding more nodes significantly improves your cache hit rate).

In general, you want your hbase nodes to run on hdfs nodes so that it can take advantage of local data access. I would find other situations somewhat unusual.

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