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https://issues.apache.org/jira/browse/RATIS-1942?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17795948#comment-17795948
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Attila Doroszlai commented on RATIS-1942:
-----------------------------------------

[~szetszwo], this might be a separate bug, but I've noticed these logs have 
exception in requestVote, e.g.:

{code}
2023-12-10 01:18:29,818 [s4@group-1DB299F682EA-LeaderElection9] INFO  
impl.LeaderElection (LogUtils.java:infoOrTrace(136)) - 
s4@group-1DB299F682EA-LeaderElection9 got exception when requesting votes: 
java.util.concurrent.ExecutionException: java.lang.NullPointerException: target
{code}

which comes from {{ManagedChannelImplBuilder}}:

{code}
    this.target = Preconditions.checkNotNull(target, "target");
{code}

called from {{GrpcServerProtocolClient}}:

{code}
        NettyChannelBuilder.forTarget(target.getAddress());
{code}

So peer address is not set when trying to request vote.

> GrpcLogAppender has ILLEGAL TRANSITION: STARTING -> STARTING
> ------------------------------------------------------------
>
>                 Key: RATIS-1942
>                 URL: https://issues.apache.org/jira/browse/RATIS-1942
>             Project: Ratis
>          Issue Type: Bug
>          Components: gRPC
>            Reporter: Tsz-wo Sze
>            Assignee: Tsz-wo Sze
>            Priority: Major
>
> TestRetryCacheWithGrpc has the following exception (although the test may 
> pass):
> {code}
> 2023-11-27 11:19:57,509 
> [s3@group-F810F08D0B98->s4-GrpcLogAppender-LogAppenderDaemon] WARN  
> leader.LogAppenderDaemon (LogAppenderDaemon.java:run(89)) - 
> s3@group-F810F08D0B98->s4-GrpcLogAppender-LogAppenderDaemon failed
> java.lang.IllegalStateException: ILLEGAL TRANSITION: In s4, STARTING -> 
> STARTING
>       at org.apache.ratis.util.Preconditions.assertTrue(Preconditions.java:61)
>       at org.apache.ratis.util.LifeCycle$State.validate(LifeCycle.java:121)
>       at org.apache.ratis.util.LifeCycle.transition(LifeCycle.java:164)
>       at 
> org.apache.ratis.util.LifeCycle.startAndTransition(LifeCycle.java:268)
>       at 
> org.apache.ratis.util.PeerProxyMap$PeerAndProxy.getProxy(PeerProxyMap.java:63)
>       at org.apache.ratis.util.PeerProxyMap.getProxy(PeerProxyMap.java:110)
>       at 
> org.apache.ratis.grpc.server.GrpcLogAppender.getClient(GrpcLogAppender.java:121)
>       at 
> org.apache.ratis.grpc.server.GrpcLogAppender.appendLog(GrpcLogAppender.java:313)
>       at 
> org.apache.ratis.grpc.server.GrpcLogAppender.run(GrpcLogAppender.java:181)
>       at 
> org.apache.ratis.server.leader.LogAppenderDaemon.run(LogAppenderDaemon.java:80)
>       at java.lang.Thread.run(Thread.java:750)
> {code}



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