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From "genericqa (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-14855) Hadoop scripts may errantly believe a daemon is still running, preventing it from starting
Date Wed, 21 Mar 2018 18:59:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-14855?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16408427#comment-16408427
] 

genericqa commented on HADOOP-14855:
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| (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 26s{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:red}-1{color} | {color:red} test4tests {color} | {color:red}  0m  0s{color} | {color:red}
The patch doesn't appear to include any new or modified tests. Please justify why no new tests
are needed for this patch. Also please list what manual steps were performed to verify this
patch. {color} |
|| || || || {color:brown} trunk Compile Tests {color} ||
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 15m 28s{color}
| {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  0m 59s{color} |
{color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} shadedclient {color} | {color:green}  9m 11s{color}
| {color:green} branch has no errors when building and testing our client artifacts. {color}
|
|| || || || {color:brown} Patch Compile Tests {color} ||
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  0m 48s{color} |
{color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} shellcheck {color} | {color:green}  0m  3s{color}
| {color:green} There were no new shellcheck issues. {color} |
| {color:green}+1{color} | {color:green} shelldocs {color} | {color:green}  0m 10s{color}
| {color:green} There were no new shelldocs issues. {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}  9m 21s{color}
| {color:green} patch has no errors when building and testing our client artifacts. {color}
|
|| || || || {color:brown} Other Tests {color} ||
| {color:green}+1{color} | {color:green} unit {color} | {color:green}  1m 40s{color} | {color:green}
hadoop-common in the patch passed. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green}  0m 18s{color}
| {color:green} The patch does not generate ASF License warnings. {color} |
| {color:black}{color} | {color:black} {color} | {color:black} 38m 45s{color} | {color:black}
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|| Subsystem || Report/Notes ||
| Docker | Client=17.05.0-ce Server=17.05.0-ce Image:yetus/hadoop:d4cc50f |
| JIRA Issue | HADOOP-14855 |
| JIRA Patch URL | https://issues.apache.org/jira/secure/attachment/12915526/HADOOP-14855.002.patch
|
| Optional Tests |  asflicense  mvnsite  unit  shellcheck  shelldocs  |
| uname | Linux bfafd6281812 4.4.0-64-generic #85-Ubuntu SMP Mon Feb 20 11:50:30 UTC 2017
x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | /testptch/patchprocess/precommit/personality/provided.sh |
| git revision | trunk / 6c63cc7 |
| maven | version: Apache Maven 3.3.9 |
| shellcheck | v0.4.6 |
|  Test Results | https://builds.apache.org/job/PreCommit-HADOOP-Build/14365/testReport/ |
| Max. process+thread count | 447 (vs. ulimit of 10000) |
| modules | C: hadoop-common-project/hadoop-common U: hadoop-common-project/hadoop-common
|
| Console output | https://builds.apache.org/job/PreCommit-HADOOP-Build/14365/console |
| Powered by | Apache Yetus 0.8.0-SNAPSHOT   http://yetus.apache.org |


This message was automatically generated.



> Hadoop scripts may errantly believe a daemon is still running, preventing it from starting
> ------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-14855
>                 URL: https://issues.apache.org/jira/browse/HADOOP-14855
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: scripts
>    Affects Versions: 3.0.0-alpha4
>            Reporter: Aaron T. Myers
>            Assignee: Robert Kanter
>            Priority: Major
>         Attachments: HADOOP-14855.001.patch, HADOOP-14855.002.patch
>
>
> I encountered a case recently where the NN wouldn't start, with the error message "namenode
is running as process 16769.  Stop it first." In fact the NN was not running at all, but rather
another long-running process was running with this pid.
> It looks to me like our scripts just check to see if _any_ process is running with the
pid that the NN (or any Hadoop daemon) most recently ran with. This is clearly not a fool-proof
way of checking to see if a particular type of daemon is now running, as some other process
could start running with the same pid since the daemon in question was previously shut down.



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