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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-10702) Add a Client API and Proxy Provider to enable stale read from Standby
Date Fri, 29 Jul 2016 21:21:20 GMT

    [ https://issues.apache.org/jira/browse/HDFS-10702?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15400018#comment-15400018
] 

Hadoop QA commented on HDFS-10702:
----------------------------------

| (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 13s{color} | {color:blue}
Docker mode activated. {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 17s{color} | {color:blue}
Maven dependency ordering for branch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  7m 50s{color}
| {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  8m 19s{color} |
{color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  1m 54s{color}
| {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  2m 58s{color} |
{color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green}  0m 44s{color}
| {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green}  5m 36s{color} |
{color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  2m 21s{color} |
{color:green} trunk passed {color} |
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue}  0m 16s{color} | {color:blue}
Maven dependency ordering for patch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  2m 26s{color}
| {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  8m 33s{color} |
{color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} cc {color} | {color:green}  8m 33s{color} | {color:green}
the patch passed {color} |
| {color:red}-1{color} | {color:red} javac {color} | {color:red}  8m 33s{color} | {color:red}
root generated 1 new + 709 unchanged - 0 fixed = 710 total (was 709) {color} |
| {color:orange}-0{color} | {color:orange} checkstyle {color} | {color:orange}  1m 43s{color}
| {color:orange} root: The patch generated 82 new + 1029 unchanged - 2 fixed = 1111 total
(was 1031) {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  2m 32s{color} |
{color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green}  0m 37s{color}
| {color:green} the patch passed {color} |
| {color:red}-1{color} | {color:red} whitespace {color} | {color:red}  0m  0s{color} | {color:red}
The patch 1 line(s) with tabs. {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green}  5m 12s{color} |
{color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  2m  5s{color} |
{color:green} the patch passed {color} |
| {color:red}-1{color} | {color:red} unit {color} | {color:red} 19m 13s{color} | {color:red}
hadoop-common in the patch failed. {color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green}  1m  8s{color} | {color:green}
hadoop-hdfs-client in the patch passed. {color} |
| {color:red}-1{color} | {color:red} unit {color} | {color:red} 66m 25s{color} | {color:red}
hadoop-hdfs in the patch failed. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green}  0m 26s{color}
| {color:green} The patch does not generate ASF License warnings. {color} |
| {color:black}{color} | {color:black} {color} | {color:black}141m 59s{color} | {color:black}
{color} |
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|| Reason || Tests ||
| Failed junit tests | hadoop.hdfs.server.namenode.ha.TestSyncInfo |
|   | hadoop.hdfs.TestFileChecksum |
|   | hadoop.hdfs.server.namenode.TestEditLog |
| Timed out junit tests | org.apache.hadoop.http.TestHttpServerLifecycle |
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|| Subsystem || Report/Notes ||
| Docker |  Image:yetus/hadoop:9560f25 |
| JIRA Patch URL | https://issues.apache.org/jira/secure/attachment/12821051/HDFS-10702.002.patch
|
| JIRA Issue | HDFS-10702 |
| Optional Tests |  asflicense  compile  javac  javadoc  mvninstall  mvnsite  unit  findbugs
 checkstyle  cc  |
| uname | Linux 593dbc1aeb19 3.13.0-36-lowlatency #63-Ubuntu SMP PREEMPT Wed Sep 3 21:56:12
UTC 2014 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | /testptch/hadoop/patchprocess/precommit/personality/provided.sh |
| git revision | trunk / 95f2b98 |
| Default Java | 1.8.0_101 |
| findbugs | v3.0.0 |
| javac | https://builds.apache.org/job/PreCommit-HDFS-Build/16257/artifact/patchprocess/diff-compile-javac-root.txt
|
| checkstyle | https://builds.apache.org/job/PreCommit-HDFS-Build/16257/artifact/patchprocess/diff-checkstyle-root.txt
|
| whitespace | https://builds.apache.org/job/PreCommit-HDFS-Build/16257/artifact/patchprocess/whitespace-tabs.txt
|
| unit | https://builds.apache.org/job/PreCommit-HDFS-Build/16257/artifact/patchprocess/patch-unit-hadoop-common-project_hadoop-common.txt
|
| unit | https://builds.apache.org/job/PreCommit-HDFS-Build/16257/artifact/patchprocess/patch-unit-hadoop-hdfs-project_hadoop-hdfs.txt
|
|  Test Results | https://builds.apache.org/job/PreCommit-HDFS-Build/16257/testReport/ |
| 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/16257/console |
| Powered by | Apache Yetus 0.4.0-SNAPSHOT   http://yetus.apache.org |


This message was automatically generated.



> Add a Client API and Proxy Provider to enable stale read from Standby
> ---------------------------------------------------------------------
>
>                 Key: HDFS-10702
>                 URL: https://issues.apache.org/jira/browse/HDFS-10702
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: Jiayi Zhou
>            Assignee: Jiayi Zhou
>            Priority: Minor
>         Attachments: HDFS-10702.001.patch, HDFS-10702.002.patch, StaleReadfromStandbyNN.pdf
>
>
> Currently, clients must always talk to the active NameNode when performing any metadata
operation, which means active NameNode could be a bottleneck for scalability. One way to solve
this problem is to send read-only operations to Standby NameNode. The disadvantage is that
it might be a stale read. 
> Here, I'm thinking of adding a Client API to enable/disable stale read from Standby which
gives Client the power to set the staleness restriction.



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