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From "Marcelo Valle (BLOOMBERG/ LONDON)" <mvallemil...@bloomberg.net>
Subject table splitting - how to check
Date Wed, 25 Feb 2015 15:09:07 GMT
Hi,

I have created an HBase table just like that:

t = create 'HBaseSerialWritesPOC', 'user_id_ts', {NAME => 'alnfo'},  {SPLITS => ['100000000000000000000000',
'200000000000000000000000', '300000000000000000000000', '400000000000000000000000', '500000000000000000000000',
'600000000000000000000000', '700000000000000000000000', '800000000000000000000000', '900000000000000000000000',
'a00000000000000000000000', 'b00000000000000000000000', 'c00000000000000000000000', 'd00000000000000000000000',
'e00000000000000000000000', 'f00000000000000000000000']}

After some tests, I truncated the table.

Then I inserted 1 million rows, just to test. I was expecting to have 16 regions for this
table, but when I checked admin UI, I saw two regions:

Table Regions
Name       Region Server   Start Key       End Key Requests
HBaseSerialWritesPOC,,1424873821297.cf92656f68a16e9696d0fbfe2494219b.        host1       
   800000190000125396f3f2bb        500625
HBaseSerialWritesPOC,800000190000125396f3f2bb,1424873821297.696a25e590e3248005c638c0f86c0564.
 host2   800000190000125396f3f2bb                500621

I am new to HBase, so it really means just 2 regions have been created, right? It seems keys
have been split in a half, 0000.. To ffff... 

I disabled, dropped and created the table again using the same command bellow, then I saw
16 regions, as expected.

Question 1: Is it possible to check the same thing using hbase shell?

Question 2: Is it expected behavior the truncate messing up the splits? What kind of DML operations
could change the splits in my table? I am using HBase 0.96.1.2.0.10.0-1-hadoop2

-Marcelo
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