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https://issues.apache.org/jira/browse/HBASE-21621?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16725341#comment-16725341
 ] 

Hadoop QA commented on HBASE-21621:
-----------------------------------

| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue}  0m 
16s{color} | {color:blue} Docker mode activated. {color} |
|| || || || {color:brown} Prechecks {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 1 new or modified test 
files. {color} |
|| || || || {color:brown} master Compile Tests {color} ||
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  4m 
 4s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  1m 
49s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  1m 
 2s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} shadedjars {color} | {color:green}  3m 
42s{color} | {color:green} branch has no errors when building our shaded 
downstream artifacts. {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green}  2m  
3s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 
29s{color} | {color:green} master passed {color} |
|| || || || {color:brown} Patch Compile Tests {color} ||
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  3m 
58s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  1m 
49s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green}  1m 
49s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  1m 
 1s{color} | {color:green} the patch passed {color} |
| {color:red}-1{color} | {color:red} whitespace {color} | {color:red}  0m  
0s{color} | {color:red} The patch has 1 line(s) that end in whitespace. Use git 
apply --whitespace=fix <<patch_file>>. Refer https://git-scm.com/docs/git-apply 
{color} |
| {color:green}+1{color} | {color:green} shadedjars {color} | {color:green}  3m 
49s{color} | {color:green} patch has no errors when building our shaded 
downstream artifacts. {color} |
| {color:green}+1{color} | {color:green} hadoopcheck {color} | {color:green}  
8m 28s{color} | {color:green} Patch does not cause any errors with Hadoop 2.7.4 
or 3.0.0. {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green}  2m 
13s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 
31s{color} | {color:green} the patch passed {color} |
|| || || || {color:brown} Other Tests {color} ||
| {color:red}-1{color} | {color:red} unit {color} | {color:red}242m 40s{color} 
| {color:red} hbase-server in the patch failed. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green}  0m 
24s{color} | {color:green} The patch does not generate ASF License warnings. 
{color} |
| {color:black}{color} | {color:black} {color} | {color:black}278m 48s{color} | 
{color:black} {color} |
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|| Reason || Tests ||
| Failed junit tests | hadoop.hbase.client.TestFromClientSide3 |
|   | hadoop.hbase.client.TestSnapshotTemporaryDirectoryWithRegionReplicas |
|   | hadoop.hbase.client.TestSnapshotDFSTemporaryDirectory |
|   | hadoop.hbase.master.procedure.TestServerCrashProcedureWithReplicas |
|   | hadoop.hbase.client.TestAdmin1 |
|   | hadoop.hbase.client.TestFromClientSide |
|   | hadoop.hbase.regionserver.TestJoinedScanners |
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|| Subsystem || Report/Notes ||
| Docker | Client=17.05.0-ce Server=17.05.0-ce Image:yetus/hbase:b002b0b |
| JIRA Issue | HBASE-21621 |
| JIRA Patch URL | 
https://issues.apache.org/jira/secure/attachment/12952377/HBASE-21621.master.UT.patch
 |
| Optional Tests |  dupname  asflicense  javac  javadoc  unit  findbugs  
shadedjars  hadoopcheck  hbaseanti  checkstyle  compile  |
| uname | Linux 3eb8b0d2eb1d 4.4.0-138-generic #164-Ubuntu SMP Tue Oct 2 
17:16:02 UTC 2018 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | 
/home/jenkins/jenkins-slave/workspace/PreCommit-HBASE-Build/component/dev-support/hbase-personality.sh
 |
| git revision | master / 8991877bb2 |
| maven | version: Apache Maven 3.5.4 
(1edded0938998edf8bf061f1ceb3cfdeccf443fe; 2018-06-17T18:33:14Z) |
| Default Java | 1.8.0_181 |
| findbugs | v3.1.0-RC3 |
| whitespace | 
https://builds.apache.org/job/PreCommit-HBASE-Build/15330/artifact/patchprocess/whitespace-eol.txt
 |
| unit | 
https://builds.apache.org/job/PreCommit-HBASE-Build/15330/artifact/patchprocess/patch-unit-hbase-server.txt
 |
|  Test Results | 
https://builds.apache.org/job/PreCommit-HBASE-Build/15330/testReport/ |
| Max. process+thread count | 4858 (vs. ulimit of 10000) |
| modules | C: hbase-server U: hbase-server |
| Console output | 
https://builds.apache.org/job/PreCommit-HBASE-Build/15330/console |
| Powered by | Apache Yetus 0.8.0   http://yetus.apache.org |


This message was automatically generated.



> Reversed scan does not return expected  number of rows
> ------------------------------------------------------
>
>                 Key: HBASE-21621
>                 URL: https://issues.apache.org/jira/browse/HBASE-21621
>             Project: HBase
>          Issue Type: Bug
>          Components: scan
>    Affects Versions: 3.0.0, 2.1.1
>            Reporter: Nihal Jain
>            Priority: Critical
>         Attachments: HBASE-21621.master.UT.patch
>
>
> *Steps to reproduce*
>  # Create a table and put some data into it (data should be big enough, say N 
> rows)
>  # Flush the table
>  # Scan the table with reversed set to true
> *Expected Result*
> N rows should be retrieved in reversed order
> *Actual Result*
> Less than expected number of rows is retrieved with following error in logs
> {noformat}
> 2018-12-19 21:55:32,944 DEBUG 
> [RpcServer.default.FPBQ.Fifo.handler=4,queue=0,port=39007] 
> regionserver.StoreScanner(1000): Switch to stream read (scanned=262214 bytes) 
> of cf
> 2018-12-19 21:55:32,955 ERROR 
> [RpcServer.default.FPBQ.Fifo.handler=4,queue=0,port=39007] 
> ipc.RpcServer(471): Unexpected throwable object 
> java.lang.AssertionError: Key 
> \x00\x00\x00\x00\x00\x00\x00\x09/cf:a/1545236714675/Put/vlen=131072/seqid=4 
> followed by a error order key 
> \x00\x00\x00\x00\x00\x00\x00\x0F/cf:a/1545236715545/Put/vlen=131072/seqid=8 
> in cf cf in reversed scan
>       at 
> org.apache.hadoop.hbase.regionserver.ReversedStoreScanner.checkScanOrder(ReversedStoreScanner.java:105)
>       at 
> org.apache.hadoop.hbase.regionserver.StoreScanner.next(StoreScanner.java:568)
>       at 
> org.apache.hadoop.hbase.regionserver.KeyValueHeap.next(KeyValueHeap.java:153)
>       at 
> org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.populateResult(HRegion.java:6598)
>       at 
> org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.nextInternal(HRegion.java:6762)
>       at 
> org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.nextRaw(HRegion.java:6535)
>       at 
> org.apache.hadoop.hbase.regionserver.RSRpcServices.scan(RSRpcServices.java:3252)
>       at 
> org.apache.hadoop.hbase.regionserver.RSRpcServices.scan(RSRpcServices.java:3501)
>       at 
> org.apache.hadoop.hbase.shaded.protobuf.generated.ClientProtos$ClientService$2.callBlockingMethod(ClientProtos.java:42002)
>       at org.apache.hadoop.hbase.ipc.RpcServer.call(RpcServer.java:413)
>       at org.apache.hadoop.hbase.ipc.CallRunner.run(CallRunner.java:130)
>       at 
> org.apache.hadoop.hbase.ipc.RpcExecutor$Handler.run(RpcExecutor.java:324)
>       at 
> org.apache.hadoop.hbase.ipc.RpcExecutor$Handler.run(RpcExecutor.java:304)
> 2018-12-19 21:55:32,955 DEBUG 
> [RpcServer.default.FPBQ.Fifo.handler=4,queue=0,port=39007] 
> ipc.CallRunner(142): callId: 508 service: ClientService methodName: Scan 
> size: 47 connection: 127.0.0.1:48328 deadline: 1545236792955, 
> exception=java.io.IOException: Key 
> \x00\x00\x00\x00\x00\x00\x00\x09/cf:a/1545236714675/Put/vlen=131072/seqid=4 
> followed by a error order key 
> \x00\x00\x00\x00\x00\x00\x00\x0F/cf:a/1545236715545/Put/vlen=131072/seqid=8 
> in cf cf in reversed scan
> 2018-12-19 21:55:33,060 DEBUG 
> [RpcServer.default.FPBQ.Fifo.handler=4,queue=0,port=39007] 
> ipc.CallRunner(142): callId: 511 service: ClientService methodName: Scan 
> size: 47 connection: 127.0.0.1:48328 deadline: 1545236792955, 
> exception=org.apache.hadoop.hbase.exceptions.OutOfOrderScannerNextException: 
> Expected nextCallSeq: 1 But the nextCallSeq got from client: 0; 
> request=scanner_id: 2421102592655360183 number_of_rows: 2147483647 
> close_scanner: false next_call_seq: 0 client_handles_partials: true 
> client_handles_heartbeats: true track_scan_metrics: false renew: false
> 2018-12-19 21:55:33,060 DEBUG [Time-limited test] 
> client.ScannerCallableWithReplicas(200): Scan with primary region returns 
> org.apache.hadoop.hbase.exceptions.OutOfOrderScannerNextException: 
> org.apache.hadoop.hbase.exceptions.OutOfOrderScannerNextException: Expected 
> nextCallSeq: 1 But the nextCallSeq got from client: 0; request=scanner_id: 
> 2421102592655360183 number_of_rows: 2147483647 close_scanner: false 
> next_call_seq: 0 client_handles_partials: true client_handles_heartbeats: 
> true track_scan_metrics: false renew: false
>       at 
> org.apache.hadoop.hbase.regionserver.RSRpcServices.checkScanNextCallSeq(RSRpcServices.java:3122)
>       at 
> org.apache.hadoop.hbase.regionserver.RSRpcServices.scan(RSRpcServices.java:3455)
>       at 
> org.apache.hadoop.hbase.shaded.protobuf.generated.ClientProtos$ClientService$2.callBlockingMethod(ClientProtos.java:42002)
>       at org.apache.hadoop.hbase.ipc.RpcServer.call(RpcServer.java:413)
>       at org.apache.hadoop.hbase.ipc.CallRunner.run(CallRunner.java:130)
>       at 
> org.apache.hadoop.hbase.ipc.RpcExecutor$Handler.run(RpcExecutor.java:324)
>       at 
> org.apache.hadoop.hbase.ipc.RpcExecutor$Handler.run(RpcExecutor.java:304)
> {noformat}
> *Analysis/Issue*
> From initial analysis it seems problem occurs when we switch read type 



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