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https://issues.apache.org/jira/browse/HBASE-17125?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16121908#comment-16121908
 ] 

Hadoop QA commented on HBASE-17125:
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue}  0m 
20s{color} | {color:blue} Docker mode activated. {color} |
| {color:green}+1{color} | {color:green} hbaseanti {color} | {color:green}  0m  
0s{color} | {color:green} Patch does not have any anti-patterns. {color} |
| {color:green}+1{color} | {color:green} @author {color} | {color:green}  0m  
0s{color} | {color:green} The patch does not contain any @author tags. {color} |
| {color:green}+1{color} | {color:green} test4tests {color} | {color:green}  0m 
 0s{color} | {color:green} The patch appears to include 4 new or modified test 
files. {color} |
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue}  0m 
37s{color} | {color:blue} Maven dependency ordering for branch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  3m 
52s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  1m  
5s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  0m 
52s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green}  0m 
27s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green}  4m 
40s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  1m  
2s{color} | {color:green} master passed {color} |
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue}  0m 
18s{color} | {color:blue} Maven dependency ordering for patch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  1m 
14s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  1m  
7s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green}  1m  
7s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  0m 
52s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green}  0m 
26s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} whitespace {color} | {color:green}  0m 
 0s{color} | {color:green} The patch has no whitespace issues. {color} |
| {color:green}+1{color} | {color:green} hadoopcheck {color} | {color:green} 
32m 48s{color} | {color:green} Patch does not cause any errors with Hadoop 
2.6.1 2.6.2 2.6.3 2.6.4 2.6.5 2.7.1 2.7.2 2.7.3 or 3.0.0-alpha4. {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green}  5m  
5s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 
56s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green}  2m 
55s{color} | {color:green} hbase-client in the patch passed. {color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green}156m 
21s{color} | {color:green} hbase-server in the patch passed. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green}  0m 
32s{color} | {color:green} The patch does not generate ASF License warnings. 
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| {color:black}{color} | {color:black} {color} | {color:black}216m 13s{color} | 
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|| Subsystem || Report/Notes ||
| Docker | Client=17.03.0-ce Server=17.03.0-ce Image:yetus/hbase:bdc94b1 |
| JIRA Issue | HBASE-17125 |
| JIRA Patch URL | 
https://issues.apache.org/jira/secure/attachment/12881209/HBASE-17125.master.022.patch
 |
| Optional Tests |  asflicense  javac  javadoc  unit  findbugs  hadoopcheck  
hbaseanti  checkstyle  compile  |
| uname | Linux a96bed34faa6 3.13.0-119-generic #166-Ubuntu SMP Wed May 3 
12:18:55 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | 
/home/jenkins/jenkins-slave/workspace/PreCommit-HBASE-Build@2/component/dev-support/hbase-personality.sh
 |
| git revision | master / 6246523 |
| Default Java | 1.8.0_131 |
| findbugs | v3.1.0-RC3 |
|  Test Results | 
https://builds.apache.org/job/PreCommit-HBASE-Build/8015/testReport/ |
| modules | C: hbase-client hbase-server U: . |
| Console output | 
https://builds.apache.org/job/PreCommit-HBASE-Build/8015/console |
| Powered by | Apache Yetus 0.4.0   http://yetus.apache.org |


This message was automatically generated.



> Inconsistent result when use filter to read data
> ------------------------------------------------
>
>                 Key: HBASE-17125
>                 URL: https://issues.apache.org/jira/browse/HBASE-17125
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Guanghao Zhang
>            Assignee: Guanghao Zhang
>            Priority: Critical
>             Fix For: 3.0.0, 2.0.0-alpha-2
>
>         Attachments: 17125-slack-13.txt, example.diff, 
> HBASE-17125.master.001.patch, HBASE-17125.master.002.patch, 
> HBASE-17125.master.002.patch, HBASE-17125.master.003.patch, 
> HBASE-17125.master.004.patch, HBASE-17125.master.005.patch, 
> HBASE-17125.master.006.patch, HBASE-17125.master.007.patch, 
> HBASE-17125.master.008.patch, HBASE-17125.master.009.patch, 
> HBASE-17125.master.009.patch, HBASE-17125.master.010.patch, 
> HBASE-17125.master.011.patch, HBASE-17125.master.011.patch, 
> HBASE-17125.master.012.patch, HBASE-17125.master.013.patch, 
> HBASE-17125.master.014.patch, HBASE-17125.master.015.patch, 
> HBASE-17125.master.016.patch, HBASE-17125.master.017.patch, 
> HBASE-17125.master.018.patch, HBASE-17125.master.019.patch, 
> HBASE-17125.master.020.patch, HBASE-17125.master.020.patch, 
> HBASE-17125.master.021.patch, HBASE-17125.master.022.patch, 
> HBASE-17125.master.checkReturnedVersions.patch, 
> HBASE-17125.master.no-specified-filter.patch
>
>
> Assume a cloumn's max versions is 3, then we write 4 versions of this column. 
> The oldest version doesn't remove immediately. But from the user view, the 
> oldest version has gone. When user use a filter to query, if the filter skip 
> a new version, then the oldest version will be seen again. But after compact 
> the region, then the oldest version will never been seen. So it is weird for 
> user. The query will get inconsistent result before and after region 
> compaction.
> The reason is matchColumn method of UserScanQueryMatcher. It first check the 
> cell by filter, then check the number of versions needed. So if the filter 
> skip the new version, then the oldest version will be seen again when it is 
> not removed.
> Have a discussion offline with [~Apache9] and [~fenghh], now we have two 
> solution for this problem. The first idea is check the number of versions 
> first, then check the cell by filter. As the comment of setFilter, the filter 
> is called after all tests for ttl, column match, deletes and max versions 
> have been run.
> {code}
>   /**
>    * Apply the specified server-side filter when performing the Query.
>    * Only {@link Filter#filterKeyValue(Cell)} is called AFTER all tests
>    * for ttl, column match, deletes and max versions have been run.
>    * @param filter filter to run on the server
>    * @return this for invocation chaining
>    */
>   public Query setFilter(Filter filter) {
>     this.filter = filter;
>     return this;
>   }
> {code}
> But this idea has another problem, if a column's max version is 5 and the 
> user query only need 3 versions. It first check the version's number, then 
> check the cell by filter. So the cells number of the result may less than 3. 
> But there are 2 versions which don't read anymore.
> So the second idea has three steps.
> 1. check by the max versions of this column
> 2. check the kv by filter
> 3. check the versions which user need.
> But this will lead the ScanQueryMatcher more complicated. And this will break 
> the javadoc of Query.setFilter.
> Now we don't have a final solution for this problem. Suggestions are welcomed.



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