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https://issues.apache.org/jira/browse/HDFS-15377?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17121054#comment-17121054
 ] 

Hadoop QA commented on HDFS-15377:
----------------------------------

| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue} 23m 
55s{color} | {color:blue} Docker mode activated. {color} |
|| || || || {color:brown} Prechecks {color} ||
| {color:green}+1{color} | {color:green} dupname {color} | {color:green}  0m  
0s{color} | {color:green} No case conflicting files found. {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} trunk Compile Tests {color} ||
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 19m 
44s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  1m 
11s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  0m 
52s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  1m 
14s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} shadedclient {color} | {color:green} 
16m 21s{color} | {color:green} branch has no errors when building and testing 
our client artifacts. {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 
54s{color} | {color:green} trunk passed {color} |
| {color:blue}0{color} | {color:blue} spotbugs {color} | {color:blue}  3m 
54s{color} | {color:blue} Used deprecated FindBugs config; considering 
switching to SpotBugs. {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green}  3m 
51s{color} | {color:green} trunk passed {color} |
|| || || || {color:brown} Patch Compile Tests {color} ||
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  1m 
25s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  1m 
14s{color} | {color:green} the patch passed {color} |
| {color:red}-1{color} | {color:red} javac {color} | {color:red}  1m 14s{color} 
| {color:red} hadoop-hdfs-project_hadoop-hdfs generated 1 new + 574 unchanged - 
1 fixed = 575 total (was 575) {color} |
| {color:orange}-0{color} | {color:orange} checkstyle {color} | {color:orange}  
1m  8s{color} | {color:orange} hadoop-hdfs-project/hadoop-hdfs: The patch 
generated 1 new + 503 unchanged - 0 fixed = 504 total (was 503) {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  1m 
34s{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} xml {color} | {color:green}  0m  
1s{color} | {color:green} The patch has no ill-formed XML file. {color} |
| {color:green}+1{color} | {color:green} shadedclient {color} | {color:green} 
17m 54s{color} | {color:green} patch has no errors when building and testing 
our client artifacts. {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 
55s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green}  4m  
3s{color} | {color:green} the patch passed {color} |
|| || || || {color:brown} Other Tests {color} ||
| {color:red}-1{color} | {color:red} unit {color} | {color:red}114m  2s{color} 
| {color:red} hadoop-hdfs in the patch passed. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green}  0m 
35s{color} | {color:green} The patch does not generate ASF License warnings. 
{color} |
| {color:black}{color} | {color:black} {color} | {color:black}211m 21s{color} | 
{color:black} {color} |
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|| Reason || Tests ||
| Failed junit tests | hadoop.hdfs.TestDFSStripedOutputStream |
|   | hadoop.hdfs.server.namenode.TestDecommissioningStatus |
|   | hadoop.hdfs.server.namenode.TestMetaSave |
|   | hadoop.hdfs.TestSafeModeWithStripedFile |
|   | hadoop.hdfs.server.blockmanagement.TestBlockTokenWithDFSStriped |
|   | hadoop.hdfs.server.namenode.TestNamenodeCapacityReport |
|   | hadoop.hdfs.server.datanode.TestBPOfferService |
|   | hadoop.hdfs.TestGetFileChecksum |
|   | hadoop.hdfs.server.namenode.ha.TestBootstrapAliasmap |
|   | hadoop.hdfs.server.namenode.TestNamenodeRetryCache |
|   | hadoop.hdfs.TestReconstructStripedFile |
|   | hadoop.hdfs.TestReconstructStripedFileWithRandomECPolicy |
|   | hadoop.hdfs.TestErasureCodingMultipleRacks |
|   | hadoop.hdfs.TestReadStripedFileWithMissingBlocks |
|   | hadoop.hdfs.TestStateAlignmentContextWithHA |
|   | hadoop.hdfs.server.namenode.ha.TestDNFencingWithReplication |
|   | hadoop.hdfs.server.namenode.sps.TestStoragePolicySatisfierWithStripedFile 
|
|   | hadoop.hdfs.server.namenode.TestDefaultBlockPlacementPolicy |
|   | hadoop.hdfs.TestDatanodeRegistration |
|   | hadoop.hdfs.server.namenode.TestFSEditLogLoader |
|   | hadoop.hdfs.TestDecommissionWithStriped |
|   | hadoop.hdfs.server.namenode.ha.TestHASafeMode |
|   | hadoop.hdfs.TestDeadNodeDetection |
|   | hadoop.hdfs.server.namenode.ha.TestRetryCacheWithHA |
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|| Subsystem || Report/Notes ||
| Docker | ClientAPI=1.40 ServerAPI=1.40 base: 
https://builds.apache.org/job/PreCommit-HDFS-Build/29391/artifact/out/Dockerfile
 |
| JIRA Issue | HDFS-15377 |
| JIRA Patch URL | 
https://issues.apache.org/jira/secure/attachment/13004482/HDFS-15377.004.patch |
| Optional Tests | dupname asflicense compile javac javadoc mvninstall mvnsite 
unit shadedclient findbugs checkstyle xml |
| uname | Linux 55ef6e5ca4b8 4.15.0-58-generic #64-Ubuntu SMP Tue Aug 6 
11:12:41 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | personality/hadoop.sh |
| git revision | trunk / ae13a5ccbea |
| Default Java | Private Build-1.8.0_252-8u252-b09-1~18.04-b09 |
| javac | 
https://builds.apache.org/job/PreCommit-HDFS-Build/29391/artifact/out/diff-compile-javac-hadoop-hdfs-project_hadoop-hdfs.txt
 |
| checkstyle | 
https://builds.apache.org/job/PreCommit-HDFS-Build/29391/artifact/out/diff-checkstyle-hadoop-hdfs-project_hadoop-hdfs.txt
 |
| unit | 
https://builds.apache.org/job/PreCommit-HDFS-Build/29391/artifact/out/patch-unit-hadoop-hdfs-project_hadoop-hdfs.txt
 |
|  Test Results | 
https://builds.apache.org/job/PreCommit-HDFS-Build/29391/testReport/ |
| Max. process+thread count | 4273 (vs. ulimit of 5500) |
| modules | C: hadoop-hdfs-project/hadoop-hdfs U: 
hadoop-hdfs-project/hadoop-hdfs |
| Console output | 
https://builds.apache.org/job/PreCommit-HDFS-Build/29391/console |
| versions | git=2.17.1 maven=3.6.0 findbugs=3.1.0-RC1 |
| Powered by | Apache Yetus 0.12.0 https://yetus.apache.org |


This message was automatically generated.



> BlockScanner scans one part per round, expect full scans after several rounds
> -----------------------------------------------------------------------------
>
>                 Key: HDFS-15377
>                 URL: https://issues.apache.org/jira/browse/HDFS-15377
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: Yang Yun
>            Assignee: Yang Yun
>            Priority: Minor
>         Attachments: HDFS-15377.002.patch, HDFS-15377.003.patch, 
> HDFS-15377.004.patch, HDFS-15377.004.patch
>
>
> For reducing disk IO, one block is separated to multiple parts, BlockScanner 
> scans only one part per round. Expect that after several rounds, the full 
> block should be scanned
> Add a new option "dfs.block.scanner.part.size". the maximum data size per 
> scan by the block scanner. this value should be the multiple of chunk size, 
> for example, 512, 1024, 4096 ...
>  Default value is -1, will disable partial scan.



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