[jira] [Updated] (ZOOKEEPER-4360) Avoid NPE during metrics execution if the leader is not set on a FOLLOWER node

["Nicoló Boschi (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ZOOKEEPER-4360?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Nicoló Boschi updated ZOOKEEPER-4360:
-------------------------------------
    Priority: Major  (was: Minor)

> 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
>            Priority: Major
>              Labels: metrics
>             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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