Nicoló Boschi created ZOOKEEPER-4360:
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Summary: Avoid NPE during metrics execution if the leader is not
set on a FOLLOWER node
Key: ZOOKEEPER-4360
URL: https://issues.apache.org/jira/browse/ZOOKEEPER-4360
Project: ZooKeeper
Issue Type: Bug
Components: metric system
Affects Versions: 3.6.2
Reporter: Nicoló Boschi
Fix For: 3.7.1
On a follower node, we had this error
{code}
ago 20, 2021 1:46:28 PM org.apache.catalina.core.StandardWrapperValve invoke
GRAVE: Servlet.service() for servlet [metrics] in context with path [/metrics]
threw exception
java.lang.NullPointerException: Cannot invoke
"org.apache.zookeeper.server.quorum.Leader.getProposalStats()" because the
return value of
"org.apache.zookeeper.server.quorum.LeaderZooKeeperServer.getLeader()" is null
at
org.apache.zookeeper.server.quorum.LeaderZooKeeperServer.lambda$registerMetrics$5(LeaderZooKeeperServer.java:122)
at
magnews.zookeeper.ZooKeeperMetricsProviderAdapter$MetricsContextImpl.lambda$registerGauge$0(ZooKeeperMetricsProviderAdapter.java:91)
{code}
Unfortunately, I'm not able to reproduce this error deterministically
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