phoenix-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Josh Elser <>
Subject Re: Ordering of numbers generated by a sequence
Date Sun, 16 Oct 2016 21:44:00 GMT
Not 100% sure, but yes, I believe this is correct. One of the servers 
would get 0-99, the other 100-199. The server to use up that batch of 
100 values would then request 200-299, etc. Setting the cache to be 0 
would likely impact the performance of Phoenix.

Using some external system to perform the global ordering may result in 
better performance. Some testing would probably be needed :)

For the final rowKeyOrderSaltedTable question, yes, I believe that query 
would work as you intend.

F21 wrote:
> I am using Phoenix 4.8.1 with HBase 1.2.3 and the Phoenix Query Server.
> I want to use a sequence to generate a monotonically increasing id for
> each row. Since the documentation states that 100 sequence numbers are
> cached by default in the client (in my case, I assume the caching would
> happen in the query server), what is the behavior if I have 2 query
> servers (load-balanced)? Does this mean Server A would generate numbers
> starting from 0, and Server B would generate numbers starting from 100?
> I need to make sure that the id is in order on a global basis for the
> whole table. Would setting the CACHE to 0 be the best of achieving this?
> Also, as the ID is monotonically increasing, I plan to salt the table
> using something like (no manual split points):
> Without setting phoenix.query.rowKeyOrderSaltedTable to true, would I
> still be able to get my records in order if I select them using
> something like this?
> SELECT * FROM mytable WHERE id > 5 && id < 100 ORDER BY id
> Thanks,
> Francis

View raw message