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https://issues.apache.org/jira/browse/YARN-8300?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16477697#comment-16477697
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Eric Yang commented on YARN-8300:
---------------------------------
[~giovanni.fumarola] Patch 003 looks good to me. I can help with the commit.
> Fix NPE in DefaultUpgradeComponentsFinder
> ------------------------------------------
>
> Key: YARN-8300
> URL: https://issues.apache.org/jira/browse/YARN-8300
> Project: Hadoop YARN
> Issue Type: Bug
> Components: yarn
> Reporter: Suma Shivaprasad
> Assignee: Suma Shivaprasad
> Priority: Major
> Fix For: 3.1.1
>
> Attachments: YARN-8300.1.patch, YARN-8300.2.patch, YARN-8300.3.patch
>
>
> In current upgrades for Yarn native services, we do not support
> addition/deletion of compoents during upgrade. On trying to upgrade with the
> same number of components in target spec as the current service spec but with
> the one of the components having a new target spec and name, see the
> following NPE in service AM logs
> {noformat}
> 2018-05-15 00:10:41,489 [IPC Server handler 0 on 37488] ERROR
> service.ClientAMService - Error while trying to upgrade service {}
> java.lang.NullPointerException
> at
> org.apache.hadoop.yarn.service.UpgradeComponentsFinder$DefaultUpgradeComponentsFinder.lambda$findTargetComponentSpecs$0(UpgradeComponentsFinder.java:103)
> at java.util.ArrayList.forEach(ArrayList.java:1257)
> at
> org.apache.hadoop.yarn.service.UpgradeComponentsFinder$DefaultUpgradeComponentsFinder.findTargetComponentSpecs(UpgradeComponentsFinder.java:100)
> at
> org.apache.hadoop.yarn.service.ServiceManager.processUpgradeRequest(ServiceManager.java:259)
> at
> org.apache.hadoop.yarn.service.ClientAMService.upgrade(ClientAMService.java:163)
> at
> org.apache.hadoop.yarn.service.impl.pb.service.ClientAMProtocolPBServiceImpl.upgradeService(ClientAMProtocolPBServiceImpl.java:81)
> at
> org.apache.hadoop.yarn.proto.ClientAMProtocol$ClientAMProtocolService$2.callBlockingMethod(ClientAMProtocol.java:5972)
> at
> org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:523)
> at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:991)
> at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:872)
> at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:818)
> at java.security.AccessController.doPrivileged(Native Method)
> at javax.security.auth.Subject.doAs(Subject.java:422)
> at
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1682)
> at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2678)
> {noformat}
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