Suma Shivaprasad created YARN-8300:
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Summary: 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
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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