lhotari edited a comment on issue #9408:
URL: https://github.com/apache/pulsar/issues/9408#issuecomment-771552894
This was the stacktrace for the NPE that I happened to come across. I wonder
if this is a corner case at startup time. The NPE happened in a log statement.
I just wonder why the stack is so deep.
```
09:43:34.650 [metadata-store-1722-1] WARN
org.apache.pulsar.metadata.coordination.impl.LeaderElectionImpl - Exception in
state change listener
java.lang.NullPointerException: null
at
org.apache.pulsar.broker.PulsarService.lambda$startLeaderElectionService$3(PulsarService.java:731)
~[classes/:?]
at
org.apache.pulsar.metadata.coordination.impl.LeaderElectionImpl.lambda$accept$12(LeaderElectionImpl.java:257)
~[pulsar-metadata-2.8.0-SNAPSHOT.jar:2.8.0-SNAPSHOT]
at
java.util.concurrent.CompletableFuture.uniExceptionally(CompletableFuture.java:884)
~[?:1.8.0_275]
at
java.util.concurrent.CompletableFuture$UniExceptionally.tryFire(CompletableFuture.java:866)
~[?:1.8.0_275]
at
java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:488)
~[?:1.8.0_275]
at
java.util.concurrent.CompletableFuture.completeExceptionally(CompletableFuture.java:1990)
~[?:1.8.0_275]
at
org.apache.pulsar.metadata.coordination.impl.LeaderElectionImpl.lambda$null$9(LeaderElectionImpl.java:177)
~[pulsar-metadata-2.8.0-SNAPSHOT.jar:2.8.0-SNAPSHOT]
at
java.util.concurrent.CompletableFuture.uniExceptionally(CompletableFuture.java:884)
~[?:1.8.0_275]
at
java.util.concurrent.CompletableFuture$UniExceptionally.tryFire(CompletableFuture.java:866)
~[?:1.8.0_275]
at
java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:488)
~[?:1.8.0_275]
at
java.util.concurrent.CompletableFuture.completeExceptionally(CompletableFuture.java:1990)
~[?:1.8.0_275]
at
org.apache.pulsar.metadata.coordination.impl.LeaderElectionImpl.lambda$null$9(LeaderElectionImpl.java:177)
~[pulsar-metadata-2.8.0-SNAPSHOT.jar:2.8.0-SNAPSHOT]
at
java.util.concurrent.CompletableFuture.uniExceptionally(CompletableFuture.java:884)
~[?:1.8.0_275]
at
java.util.concurrent.CompletableFuture$UniExceptionally.tryFire(CompletableFuture.java:866)
~[?:1.8.0_275]
at
java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:488)
~[?:1.8.0_275]
at
java.util.concurrent.CompletableFuture.completeExceptionally(CompletableFuture.java:1990)
~[?:1.8.0_275]
at
org.apache.pulsar.metadata.coordination.impl.LeaderElectionImpl.lambda$null$9(LeaderElectionImpl.java:177)
~[pulsar-metadata-2.8.0-SNAPSHOT.jar:2.8.0-SNAPSHOT]
at
java.util.concurrent.CompletableFuture.uniExceptionally(CompletableFuture.java:884)
~[?:1.8.0_275]
at
java.util.concurrent.CompletableFuture$UniExceptionally.tryFire(CompletableFuture.java:866)
~[?:1.8.0_275]
at
java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:488)
~[?:1.8.0_275]
at
java.util.concurrent.CompletableFuture.completeExceptionally(CompletableFuture.java:1990)
~[?:1.8.0_275]
at
org.apache.pulsar.metadata.coordination.impl.LeaderElectionImpl.lambda$null$9(LeaderElectionImpl.java:177)
~[pulsar-metadata-2.8.0-SNAPSHOT.jar:2.8.0-SNAPSHOT]
at
java.util.concurrent.CompletableFuture.uniExceptionally(CompletableFuture.java:884)
~[?:1.8.0_275]
at
java.util.concurrent.CompletableFuture$UniExceptionally.tryFire(CompletableFuture.java:866)
~[?:1.8.0_275]
at
java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:488)
~[?:1.8.0_275]
at
java.util.concurrent.CompletableFuture.completeExceptionally(CompletableFuture.java:1990)
~[?:1.8.0_275]
at
org.apache.pulsar.metadata.coordination.impl.LeaderElectionImpl.lambda$null$9(LeaderElectionImpl.java:177)
~[pulsar-metadata-2.8.0-SNAPSHOT.jar:2.8.0-SNAPSHOT]
at
java.util.concurrent.CompletableFuture.uniExceptionally(CompletableFuture.java:884)
~[?:1.8.0_275]
at
java.util.concurrent.CompletableFuture$UniExceptionally.tryFire(CompletableFuture.java:866)
~[?:1.8.0_275]
at
java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:488)
~[?:1.8.0_275]
at
java.util.concurrent.CompletableFuture.completeExceptionally(CompletableFuture.java:1990)
~[?:1.8.0_275]
.
.
.
THIS KEEPS GOING ON and ON until 1024 stackframes
.
.
.
```
full stacktrace which seems to be truncated to 1024 stack frames:
https://gist.github.com/lhotari/11cbf31cfad7d82185f42e8f06e2b5a2
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