pddNick created HBASE-21332:
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Summary: HBase scan with PageFilter cannot get all rows, non-edge
region skiped
Key: HBASE-21332
URL: https://issues.apache.org/jira/browse/HBASE-21332
Project: HBase
Issue Type: Bug
Components: regionserver, scan
Affects Versions: 1.1.2
Environment: * Server version:1.1.2.2.6.5.0-292,
revision=897822d4dd5956ca186974c10382e9094683fa29
* 2 region servers
* 4 regions
* HBase client:1.3.1
Reporter: pddNick
Attachments: HBaseTest.java, image-2018-10-17-21-14-25-354.png,
image-2018-10-17-21-15-23-439.png
When using scan with pagefilter to get data from hbase, the scanner will
skip{color:#FF0000} 'non-edge'{color} regions.The code i use comes from the
book _HBase: Definitive Guide, Example 4.8, PageFilter example._ Difference is
i use scan with startRow and stopRow.
Say i have regions with start and end keys like \{'111', '222', '333', '444'},
which means i have 3 regions \{111, 222}, \{222, 333}, \{333, 444} and they are
in different region servers. When scan with startRow '111' and stopRow '444' ,
most data in region \{222, 333} will be skiped and won't be returned by
ResultScanner.Region \{111,222} or \{333,444} works just fine and because they
contain startRowkey or stopRowkey i call them non-edge regions.
Below is some explanation with log:
{code:java}
// Here scanner works just fine in region {111,222}, it gets exactly {pageSize}
rows each time, which is 1000
...
2018-10-17 21:25:57.810 INFO 213872 [ main] c.p.s.c.HBaseTest : Test: results
from [2139718600001069] to [2179067497952422], sum [1000 : 64000], cost: [77ms]
2018-10-17 21:25:57.885 INFO 213872 [ main] c.p.s.c.HBaseTest : Test: results
from [2179098921079755] to [21c2879280113661], sum [1000 : 65000], cost: [75ms]
2018-10-17 21:25:57.962 INFO 213872 [ main] c.p.s.c.HBaseTest : Test: results
from [21c2899018774688] to [2203180876471552], sum [1000 : 66000], cost: [77ms]
// Here scanner goes from region {111,222} to {222,333}. As you can see, the
scanner gets 2405 rows with stopRow '3373621463365126'.The scanner moves to
regin {333,444} too early and most data in {222,333} are skiped.
2018-10-17 21:25:58.321 INFO 213872 [ main] c.p.s.c.HBaseTest : Test: results
from [2203223414254308] to [3373621463365126], sum [2405 : 68405], cost: [359ms]
// Now the scanner is in region {333,444}, everything works just fine
2018-10-17 21:25:58.396 INFO 213872 [ main] c.p.s.c.HBaseTest : Test: results
from [3373764408525604] to [33b3849714659525], sum [1000 : 69405], cost: [74ms]
2018-10-17 21:25:58.467 INFO 213872 [ main] c.p.s.c.HBaseTest : Test: results
from [33b3882378177107] to [33f5221377695765], sum [1000 : 70405], cost: [71ms]
...{code}
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