Sunil G created HADOOP-15116:
--------------------------------
Summary: NPE in ResourceManager when ZooKeeper goes down temporary
(HA Mode)
Key: HADOOP-15116
URL: https://issues.apache.org/jira/browse/HADOOP-15116
Project: Hadoop Common
Issue Type: Bug
Components: ha
Affects Versions: 3.0.0-beta1
Reporter: Sunil G
In an HA enabled cluster (3.0), we found that RM is failing to start with an
NPE from ActiveStandbyElector. Zookeeper was down at this time, hence client
retries were coming for a while
{code}
2017-12-13 18:21:22,460 INFO org.apache.zookeeper.ClientCnxn: Opening socket
connection to server 127.0.0.1/127.0.0.1:2181. Will not attempt to authenticate
using SASL (unknown error)
2017-12-13 18:21:22,544 INFO org.apache.hadoop.service.AbstractService: Service
org.apache.hadoop.yarn.server.resourcemanager.ActiveStandbyElectorBasedElectorService
failed in state INITED; cause: java.lang.NullPointerException
java.lang.NullPointerException
at
org.apache.hadoop.ha.ActiveStandbyElector$3.run(ActiveStandbyElector.java:1039)
at
org.apache.hadoop.ha.ActiveStandbyElector$3.run(ActiveStandbyElector.java:1036)
at
org.apache.hadoop.ha.ActiveStandbyElector.zkDoWithRetries(ActiveStandbyElector.java:1101)
at
org.apache.hadoop.ha.ActiveStandbyElector.zkDoWithRetries(ActiveStandbyElector.java:1093)
at
org.apache.hadoop.ha.ActiveStandbyElector.createWithRetries(ActiveStandbyElector.java:1036)
at
org.apache.hadoop.ha.ActiveStandbyElector.ensureParentZNode(ActiveStandbyElector.java:347)
at
org.apache.hadoop.yarn.server.resourcemanager.ActiveStandbyElectorBasedElectorService.serviceInit(ActiveStandbyElectorBasedElectorService.java:110)
at
org.apache.hadoop.service.AbstractService.init(AbstractService.java:164)
at
org.apache.hadoop.service.CompositeService.serviceInit(CompositeService.java:108)
at
org.apache.hadoop.yarn.server.resourcemanager.ResourceManager.serviceInit(ResourceManager.java:326)
at
org.apache.hadoop.service.AbstractService.init(AbstractService.java:164)
at
org.apache.hadoop.yarn.server.resourcemanager.ResourceManager.main(ResourceManager.java:1420)
2017-12-13 18:21:22,545 INFO org.apache.hadoop.ha.ActiveStandbyElector:
Yielding from election
2017-12-13 18:21:22,545 INFO org.apache.hadoop.service.AbstractService: Service
ResourceManager failed in state INITED; cause: java.lang.NullPointerException
{code}
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