Hi,
I am pretty new to HBase so it would be great if someone could help me out
with my below queries;
(Ours is a time series data and all the queries will be range scan on
composite row keys)
a) What is the usual practice of storing data types.
We have noticed that converting datatypes to bytes render unreadable data
while debugging.
For ids, or int values we see the byte representation. So for some important
columns
we converted into datatype -> characters ->bytes, rather than datatype ->
bytes
(May be we can write a wrapper over hbase shell to solve this. But is there
a simpler way)
b) What is the best way to achieve operations like AVG,SUM or some custom
formula for real time queries. Coprocessors or in-memory with query result?
(The formula that we apply might get changed at any time so storing result
is not an option)
c) We are planning to start off with a four node cluster, having both HBase and
MR jobs running.
I have heard that it is not recommended to have both HBase and MR on the
same cluster, but I would
like to understand what could be the possible bottle necks.
(We plan to run MR on HDFS and MR on Hbase. Most of our MR jobs are IO bound
rather than CPU bound)
Thanks
Vivek
