[jira] [Commented] (YARN-8252) Fix ServiceMaster main not found
[
https://issues.apache.org/jira/browse/YARN-8252?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16556948#comment-16556948
]
Zoltan Haindrich commented on YARN-8252:
[~jmarhuen]: I've found out that this is "normal" but very misleaing at first
you have to run {{yarn app -enableFastLaunch }} to enable it prior to
launching the service - I think it would be better to either do automatically
on first launch ; or give a better explanation about what's going south
> Fix ServiceMaster main not found
>
>
> Key: YARN-8252
> URL: https://issues.apache.org/jira/browse/YARN-8252
> Project: Hadoop YARN
> Issue Type: Bug
>Affects Versions: 3.1.0
>Reporter: Zoltan Haindrich
>Priority: Major
>
> I was looking into using yarn services; however it seems for some reason it
> is not possible to run {{ServiceMaster}} class from the jar...I might be
> missing some fundamental...so I've put together a shellscript to make it easy
> for anyone to checkI would be happy with any exception beyond main not
> found
> [ServiceMaster.main
> method|https://github.com/apache/hadoop/blob/67f239c42f676237290d18ddbbc9aec369267692/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-services/hadoop-yarn-services-core/src/main/java/org/apache/hadoop/yarn/service/ServiceMaster.java#L305]
> {code:java}
> #!/bin/bash
> set -e
> wget -O core.jar -nv
> http://central.maven.org/maven2/org/apache/hadoop/hadoop-yarn-services-core/3.1.0/hadoop-yarn-services-core-3.1.0.jar
> unzip -qn core.jar
> cat > org/apache/hadoop/yarn/service/ServiceMaster2.java << EOF
> package org.apache.hadoop.yarn.service;
> public class ServiceMaster2 {
> public static void main(String[] args) throws Exception {
> System.out.println("asd!");
> }
> }
> EOF
> javac org/apache/hadoop/yarn/service/ServiceMaster2.java
> jar -cf a1.jar org
> find org -name ServiceMaster*
> # this will print "asd!"
> java -cp a1.jar org.apache.hadoop.yarn.service.ServiceMaster2
> #the following invocations result in:
> # Error: Could not find or load main class
> org.apache.hadoop.yarn.service.ServiceMaster
> #
> set +e
> java -cp a1.jar org.apache.hadoop.yarn.service.ServiceMaster
> java -cp core.jar org.apache.hadoop.yarn.service.ServiceMaster
> {code}
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[jira] [Commented] (YARN-8252) Fix ServiceMaster main not found
[
https://issues.apache.org/jira/browse/YARN-8252?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16556890#comment-16556890
]
Jaume M commented on YARN-8252:
---
I'm seeing this when trying to install LLAP with hadoop master. The container
doesn't start and the only error line is:
{{Error: Could not find or load main class
org.apache.hadoop.yarn.service.ServiceMaster}}
> Fix ServiceMaster main not found
>
>
> Key: YARN-8252
> URL: https://issues.apache.org/jira/browse/YARN-8252
> Project: Hadoop YARN
> Issue Type: Bug
>Affects Versions: 3.1.0
>Reporter: Zoltan Haindrich
>Priority: Major
>
> I was looking into using yarn services; however it seems for some reason it
> is not possible to run {{ServiceMaster}} class from the jar...I might be
> missing some fundamental...so I've put together a shellscript to make it easy
> for anyone to checkI would be happy with any exception beyond main not
> found
> [ServiceMaster.main
> method|https://github.com/apache/hadoop/blob/67f239c42f676237290d18ddbbc9aec369267692/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-services/hadoop-yarn-services-core/src/main/java/org/apache/hadoop/yarn/service/ServiceMaster.java#L305]
> {code:java}
> #!/bin/bash
> set -e
> wget -O core.jar -nv
> http://central.maven.org/maven2/org/apache/hadoop/hadoop-yarn-services-core/3.1.0/hadoop-yarn-services-core-3.1.0.jar
> unzip -qn core.jar
> cat > org/apache/hadoop/yarn/service/ServiceMaster2.java << EOF
> package org.apache.hadoop.yarn.service;
> public class ServiceMaster2 {
> public static void main(String[] args) throws Exception {
> System.out.println("asd!");
> }
> }
> EOF
> javac org/apache/hadoop/yarn/service/ServiceMaster2.java
> jar -cf a1.jar org
> find org -name ServiceMaster*
> # this will print "asd!"
> java -cp a1.jar org.apache.hadoop.yarn.service.ServiceMaster2
> #the following invocations result in:
> # Error: Could not find or load main class
> org.apache.hadoop.yarn.service.ServiceMaster
> #
> set +e
> java -cp a1.jar org.apache.hadoop.yarn.service.ServiceMaster
> java -cp core.jar org.apache.hadoop.yarn.service.ServiceMaster
> {code}
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[jira] [Commented] (YARN-8252) Fix ServiceMaster main not found
[
https://issues.apache.org/jira/browse/YARN-8252?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16466059#comment-16466059
]
Zoltan Haindrich commented on YARN-8252:
currently the only jar provided at startup is a vanilla
{{yarn-service-core.jar}}; I think the idea was to provide a fat at launch
time... (or add all dependencies)
I don't seem to be able to see a suiteable fat jar in the build...but I'm not
that familiar with hadoop build; so there might be one :D
> Fix ServiceMaster main not found
>
>
> Key: YARN-8252
> URL: https://issues.apache.org/jira/browse/YARN-8252
> Project: Hadoop YARN
> Issue Type: Bug
>Affects Versions: 3.1.0
>Reporter: Zoltan Haindrich
>Priority: Major
>
> I was looking into using yarn services; however it seems for some reason it
> is not possible to run {{ServiceMaster}} class from the jar...I might be
> missing some fundamental...so I've put together a shellscript to make it easy
> for anyone to checkI would be happy with any exception beyond main not
> found
> [ServiceMaster.main
> method|https://github.com/apache/hadoop/blob/67f239c42f676237290d18ddbbc9aec369267692/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-services/hadoop-yarn-services-core/src/main/java/org/apache/hadoop/yarn/service/ServiceMaster.java#L305]
> {code:java}
> #!/bin/bash
> set -e
> wget -O core.jar -nv
> http://central.maven.org/maven2/org/apache/hadoop/hadoop-yarn-services-core/3.1.0/hadoop-yarn-services-core-3.1.0.jar
> unzip -qn core.jar
> cat > org/apache/hadoop/yarn/service/ServiceMaster2.java << EOF
> package org.apache.hadoop.yarn.service;
> public class ServiceMaster2 {
> public static void main(String[] args) throws Exception {
> System.out.println("asd!");
> }
> }
> EOF
> javac org/apache/hadoop/yarn/service/ServiceMaster2.java
> jar -cf a1.jar org
> find org -name ServiceMaster*
> # this will print "asd!"
> java -cp a1.jar org.apache.hadoop.yarn.service.ServiceMaster2
> #the following invocations result in:
> # Error: Could not find or load main class
> org.apache.hadoop.yarn.service.ServiceMaster
> #
> set +e
> java -cp a1.jar org.apache.hadoop.yarn.service.ServiceMaster
> java -cp core.jar org.apache.hadoop.yarn.service.ServiceMaster
> {code}
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[jira] [Commented] (YARN-8252) Fix ServiceMaster main not found
[
https://issues.apache.org/jira/browse/YARN-8252?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16466001#comment-16466001
]
Zoltan Haindrich commented on YARN-8252:
the problem is that {{ServiceMaster}} extends {{CompositeService}} ; which is
in {{hadoop-common.jar}} - hence the class containing the main method could not
be loaded...it's unfortunate that the jvm is unable to provide more information
about the problem
I think it would be better to separate the main method to be in a separate
class file.
And this brings me to the originial problem: because I've run into this... it
seems "hadoop-common" is not on the classpath when ServiceMaster is starting up
(invoked using api to bring up llap service)
> Fix ServiceMaster main not found
>
>
> Key: YARN-8252
> URL: https://issues.apache.org/jira/browse/YARN-8252
> Project: Hadoop YARN
> Issue Type: Bug
>Affects Versions: 3.1.0
>Reporter: Zoltan Haindrich
>Priority: Major
>
> I was looking into using yarn services; however it seems for some reason it
> is not possible to run {{ServiceMaster}} class from the jar...I might be
> missing some fundamental...so I've put together a shellscript to make it easy
> for anyone to checkI would be happy with any exception beyond main not
> found
> [ServiceMaster.main
> method|https://github.com/apache/hadoop/blob/67f239c42f676237290d18ddbbc9aec369267692/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-services/hadoop-yarn-services-core/src/main/java/org/apache/hadoop/yarn/service/ServiceMaster.java#L305]
> {code:java}
> #!/bin/bash
> set -e
> wget -O core.jar -nv
> http://central.maven.org/maven2/org/apache/hadoop/hadoop-yarn-services-core/3.1.0/hadoop-yarn-services-core-3.1.0.jar
> unzip -qn core.jar
> cat > org/apache/hadoop/yarn/service/ServiceMaster2.java << EOF
> package org.apache.hadoop.yarn.service;
> public class ServiceMaster2 {
> public static void main(String[] args) throws Exception {
> System.out.println("asd!");
> }
> }
> EOF
> javac org/apache/hadoop/yarn/service/ServiceMaster2.java
> jar -cf a1.jar org
> find org -name ServiceMaster*
> # this will print "asd!"
> java -cp a1.jar org.apache.hadoop.yarn.service.ServiceMaster2
> #the following invocations result in:
> # Error: Could not find or load main class
> org.apache.hadoop.yarn.service.ServiceMaster
> #
> set +e
> java -cp a1.jar org.apache.hadoop.yarn.service.ServiceMaster
> java -cp core.jar org.apache.hadoop.yarn.service.ServiceMaster
> {code}
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