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Row Key Design in time based aplication

I want to hold event log data in hbase but I couldn't decide row key. I must hold project id and time,I will use project ld and time combination while searching.

Row key can be below


In similiar application(open source TSDB) time is divided 1000 to round in this project.I can use this strategy but I don't know how we decide what divider must be?  1000 or 10000.

Why time is divided 1000 in this application? why didn't be hold without division?

Can you explain this strategy?