Details
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Bug
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Status: Resolved
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Minor
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Resolution: Not A Problem
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1.1.2
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None
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None
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- Server version:1.1.2.2.6.5.0-292, revision=897822d4dd5956ca186974c10382e9094683fa29
- 2 region servers
- 4 regions
- HBase client:1.3.1
Description
When using scan with pagefilter to get data from hbase, the scanner will skip 'non-edge' 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 region {222,333} doesn't contain startRowkey or stopRowkey i call it non-edge region.
Below is some explanation with log:
// 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] ...
