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https://issues.apache.org/jira/browse/HDFS-6524?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16950287#comment-16950287
 ] 

Hadoop QA commented on HDFS-6524:
---------------------------------

| (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 
30s{color} | {color:blue} Docker mode activated. {color} |
|| || || || {color:brown} Prechecks {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:blue}0{color} | {color:blue} mvndep {color} | {color:blue}  0m 
27s{color} | {color:blue} Maven dependency ordering for branch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 18m 
 1s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  3m  
7s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  0m 
56s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  1m 
56s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} shadedclient {color} | {color:green} 
14m 26s{color} | {color:green} branch has no errors when building and testing 
our client artifacts. {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green}  4m 
16s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  1m 
57s{color} | {color:green} trunk passed {color} |
|| || || || {color:brown} Patch Compile Tests {color} ||
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue}  0m 
11s{color} | {color:blue} Maven dependency ordering for patch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  1m 
47s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  3m 
18s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green}  3m 
18s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  0m 
50s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  1m 
47s{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} shadedclient {color} | {color:green} 
12m 46s{color} | {color:green} patch has no errors when building and testing 
our client artifacts. {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green}  4m 
39s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  1m 
52s{color} | {color:green} the patch passed {color} |
|| || || || {color:brown} Other Tests {color} ||
| {color:green}+1{color} | {color:green} unit {color} | {color:green}  2m  
1s{color} | {color:green} hadoop-hdfs-client in the patch passed. {color} |
| {color:red}-1{color} | {color:red} unit {color} | {color:red} 88m 26s{color} 
| {color:red} hadoop-hdfs in the patch failed. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green}  0m 
36s{color} | {color:green} The patch does not generate ASF License warnings. 
{color} |
| {color:black}{color} | {color:black} {color} | {color:black}163m  5s{color} | 
{color:black} {color} |
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|| Reason || Tests ||
| Failed junit tests | hadoop.hdfs.tools.TestGetConf |
|   | hadoop.hdfs.server.namenode.snapshot.TestRenameWithSnapshots |
|   | hadoop.hdfs.server.blockmanagement.TestUnderReplicatedBlocks |
|   | hadoop.hdfs.TestRollingUpgrade |
|   | hadoop.hdfs.server.balancer.TestBalancerWithMultipleNameNodes |
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|| Subsystem || Report/Notes ||
| Docker | Client=19.03.3 Server=19.03.3 Image:yetus/hadoop:104ccca9169 |
| JIRA Issue | HDFS-6524 |
| JIRA Patch URL | 
https://issues.apache.org/jira/secure/attachment/12982869/HDFS-6524.007.patch |
| Optional Tests |  dupname  asflicense  compile  javac  javadoc  mvninstall  
mvnsite  unit  shadedclient  findbugs  checkstyle  |
| uname | Linux 36dc5219fff4 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 | /testptch/patchprocess/precommit/personality/provided.sh |
| git revision | trunk / 5f4641a |
| maven | version: Apache Maven 3.3.9 |
| Default Java | 1.8.0_222 |
| findbugs | v3.1.0-RC1 |
| unit | 
https://builds.apache.org/job/PreCommit-HDFS-Build/28083/artifact/out/patch-unit-hadoop-hdfs-project_hadoop-hdfs.txt
 |
|  Test Results | 
https://builds.apache.org/job/PreCommit-HDFS-Build/28083/testReport/ |
| Max. process+thread count | 4305 (vs. ulimit of 5500) |
| modules | C: hadoop-hdfs-project/hadoop-hdfs-client 
hadoop-hdfs-project/hadoop-hdfs U: hadoop-hdfs-project |
| Console output | 
https://builds.apache.org/job/PreCommit-HDFS-Build/28083/console |
| Powered by | Apache Yetus 0.8.0   http://yetus.apache.org |


This message was automatically generated.



> Choosing datanode  retries times considering with block replica number
> ----------------------------------------------------------------------
>
>                 Key: HDFS-6524
>                 URL: https://issues.apache.org/jira/browse/HDFS-6524
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: hdfs-client
>    Affects Versions: 3.0.0-alpha1
>            Reporter: Liang Xie
>            Assignee: Lisheng Sun
>            Priority: Minor
>              Labels: BB2015-05-TBR
>         Attachments: HDFS-6524.001.patch, HDFS-6524.002.patch, 
> HDFS-6524.003.patch, HDFS-6524.004.patch, HDFS-6524.005(2).patch, 
> HDFS-6524.005.patch, HDFS-6524.006.patch, HDFS-6524.007.patch, HDFS-6524.txt
>
>
> Currently the chooseDataNode() does retry with the setting: 
> dfsClientConf.maxBlockAcquireFailures, which by default is 3 
> (DFS_CLIENT_MAX_BLOCK_ACQUIRE_FAILURES_DEFAULT = 3), it would be better 
> having another option, block replication factor. One cluster with only  two 
> block replica setting, or using Reed-solomon encoding solution with one 
> replica factor. It helps to reduce the long tail latency.



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