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https://issues.apache.org/jira/browse/HDFS-12964?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17085721#comment-17085721
 ] 

Hadoop QA commented on HDFS-12964:
----------------------------------

| (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 
58s{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}  1m  
8s{color} | {color:blue} Maven dependency ordering for branch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 24m 
19s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 20m  
6s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  3m 
 8s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  4m  
1s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} shadedclient {color} | {color:green} 
23m 35s{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}  7m 
23s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  2m 
15s{color} | {color:green} trunk passed {color} |
|| || || || {color:brown} Patch Compile Tests {color} ||
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue}  0m 
20s{color} | {color:blue} Maven dependency ordering for patch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  2m 
32s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 15m 
15s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green} 15m 
15s{color} | {color:green} the patch passed {color} |
| {color:orange}-0{color} | {color:orange} checkstyle {color} | {color:orange}  
2m 36s{color} | {color:orange} root: The patch generated 7 new + 73 unchanged - 
0 fixed = 80 total (was 73) {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  3m 
25s{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} 
14m 23s{color} | {color:green} patch has no errors when building and testing 
our client artifacts. {color} |
| {color:red}-1{color} | {color:red} findbugs {color} | {color:red}  2m 
33s{color} | {color:red} hadoop-hdfs-project/hadoop-hdfs-client generated 1 new 
+ 0 unchanged - 0 fixed = 1 total (was 0) {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  2m 
18s{color} | {color:green} the patch passed {color} |
|| || || || {color:brown} Other Tests {color} ||
| {color:green}+1{color} | {color:green} unit {color} | {color:green}  9m  
5s{color} | {color:green} hadoop-common in the patch passed. {color} |
| {color:red}-1{color} | {color:red} unit {color} | {color:red}  2m  1s{color} 
| {color:red} hadoop-hdfs-client in the patch passed. {color} |
| {color:red}-1{color} | {color:red} unit {color} | {color:red}116m 56s{color} 
| {color:red} hadoop-hdfs in the patch passed. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green}  0m 
48s{color} | {color:green} The patch does not generate ASF License warnings. 
{color} |
| {color:black}{color} | {color:black} {color} | {color:black}260m 26s{color} | 
{color:black} {color} |
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|| Reason || Tests ||
| FindBugs | module:hadoop-hdfs-project/hadoop-hdfs-client |
|  |  Inconsistent synchronization of 
org.apache.hadoop.hdfs.DFSInputStream.needRefreshLocatedBlocks; locked 66% of 
time  Unsynchronized access at DFSInputStream.java:66% of time  Unsynchronized 
access at DFSInputStream.java:[line 2119] |
| Failed junit tests | 
hadoop.hdfs.server.namenode.ha.TestConfiguredFailoverProxyProvider |
|   | hadoop.hdfs.server.namenode.TestAuditLogs |
|   | hadoop.hdfs.TestDecommissionWithStriped |
|   | hadoop.hdfs.server.namenode.TestPersistentStoragePolicySatisfier |
|   | hadoop.hdfs.server.namenode.ha.TestObserverNode |
|   | hadoop.hdfs.TestRollingUpgrade |
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|| Subsystem || Report/Notes ||
| Docker | Client=19.03.8 Server=19.03.8 Image:yetus/hadoop:e6455cc864d |
| JIRA Issue | HDFS-12964 |
| JIRA Patch URL | 
https://issues.apache.org/jira/secure/attachment/13000239/HDFS-12964.002.patch |
| Optional Tests |  dupname  asflicense  compile  javac  javadoc  mvninstall  
mvnsite  unit  shadedclient  findbugs  checkstyle  xml  |
| uname | Linux ab9fec9122ec 4.15.0-74-generic #84-Ubuntu SMP Thu Dec 19 
08:06:28 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | /testptch/patchprocess/precommit/personality/provided.sh |
| git revision | trunk / 37d6582 |
| maven | version: Apache Maven 3.3.9 |
| Default Java | 1.8.0_242 |
| findbugs | v3.1.0-RC1 |
| checkstyle | 
https://builds.apache.org/job/PreCommit-HDFS-Build/29171/artifact/out/diff-checkstyle-root.txt
 |
| findbugs | 
https://builds.apache.org/job/PreCommit-HDFS-Build/29171/artifact/out/new-findbugs-hadoop-hdfs-project_hadoop-hdfs-client.html
 |
| unit | 
https://builds.apache.org/job/PreCommit-HDFS-Build/29171/artifact/out/patch-unit-hadoop-hdfs-project_hadoop-hdfs-client.txt
 |
| unit | 
https://builds.apache.org/job/PreCommit-HDFS-Build/29171/artifact/out/patch-unit-hadoop-hdfs-project_hadoop-hdfs.txt
 |
|  Test Results | 
https://builds.apache.org/job/PreCommit-HDFS-Build/29171/testReport/ |
| Max. process+thread count | 2973 (vs. ulimit of 5500) |
| modules | C: hadoop-common-project/hadoop-common 
hadoop-hdfs-project/hadoop-hdfs-client hadoop-hdfs-project/hadoop-hdfs U: . |
| Console output | 
https://builds.apache.org/job/PreCommit-HDFS-Build/29171/console |
| Powered by | Apache Yetus 0.8.0   http://yetus.apache.org |


This message was automatically generated.



> Read a opened file timely and effectively when it's being written by other
> --------------------------------------------------------------------------
>
>                 Key: HDFS-12964
>                 URL: https://issues.apache.org/jira/browse/HDFS-12964
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: hdfs-client
>            Reporter: Yang Yun
>            Assignee: Yang Yun
>            Priority: Minor
>         Attachments: HADOOP-12964.001.patch, HDFS-12964.002.patch
>
>
> One thread opens a HDFS file and keeps writing.  Another thread opens same 
> file and keeps reading it at the same time, also want to get the newest 
> content of file. that happens in many environments, for example, in some 
> message transmission applications. And it also requires the new content can 
> be read timely and effectively, for there maybe many tasks are working in 
> same time.



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