First, Thank you everyone for the quick response.
Ted:
The custom split policy could be an interesting solution. Regarding
the other option you sent, if I pull the end row key, I could construct
an end key, but if I suffix the row key with the end key of the region,
would that actually solve my problem? In the contrived case, wouldn't
the suffixed key now be "California-total-California-12346" and the
other region's counter would be "California-total-California-95424" and
both of these keys would actually end up on the second region since the
sorting of the keys would impose that "California-t*" comes after
"California-[1-9]".
Part of the question is that I don't understand if calling
incrementColumnValue() on the region will always execute on the region
called, regardles of rowkey. If so, what happens when those regions are
merged?
Thanks again for the help!
On Wed 09 Oct 2013 07:43:34 PM PDT, Ted Yu wrote:
bq. 'California-total' row in each region
Of course such row key needs to be suffixed with either start or end key of
the corresponding region.
On Wed, Oct 9, 2013 at 7:39 PM, Ted Yu <[email protected]> wrote:
John:
Looks like you need a 'California-total' row in each region.
Custom Split Policy can help you achieve that, see 9.7.4.1 in:
http://hbase.apache.org/book.html#d0e6541
Cheers
On Wed, Oct 9, 2013 at 7:28 PM, Vladimir Rodionov <[email protected]
wrote:
Contrived Example
Insert rowkey "California-12345" triggers a coprocessor to call
incrementColumnValue() with a rowkey of "California-total" all on
Region 1.
This would likely be on an insert on the same region. But as the table
grows, this secondary insert could end up on another region. If it is
confined, then suppose we later insert "California-95424" which still
triggers a call to incrementColumnValue() with a rowkey of
"California-total" all on Region 2.
Are we now left with two rowkeys of "California-total"? One on each
region server? If so, what happens if these two regions are compacted
into one?
Best regards,
Nope, Your "California-total" will migrate to Region 2 after region split
is complete.
Vladimir Rodionov
Principal Platform Engineer
Carrier IQ, www.carrieriq.com
e-mail: [email protected]
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