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https://issues.apache.org/jira/browse/ZOOKEEPER-4748?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ke Han updated ZOOKEEPER-4748:
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Priority: Major (was: Minor)
> quorum.QuorumCnxManager: BufferUnderflowException
> -------------------------------------------------
>
> Key: ZOOKEEPER-4748
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-4748
> Project: ZooKeeper
> Issue Type: Bug
> Components: quorum
> Reporter: Ke Han
> Priority: Major
> Attachments: hbase--zookeeper-8db357045302.log, persistent.tar.gz
>
>
> When running zookeeper (3.5.7, integrated in HBase-2.4.7), I met the
> following error message.
> {code:java}
> 2023-09-25T11:24:41,326 ERROR [SendWorker:1] quorum.QuorumCnxManager:
> BufferUnderflowException
> java.nio.BufferUnderflowException: null
> at java.nio.HeapByteBuffer.get(HeapByteBuffer.java:155) ~[?:1.8.0_362]
> at java.nio.ByteBuffer.get(ByteBuffer.java:723) ~[?:1.8.0_362]
> at
> org.apache.zookeeper.server.quorum.QuorumCnxManager$SendWorker.send(QuorumCnxManager.java:1083)
> ~[zookeeper-3.5.7.jar:3.5.7]
> at
> org.apache.zookeeper.server.quorum.QuorumCnxManager$SendWorker.run(QuorumCnxManager.java:1115)
> ~[zookeeper-3.5.7.jar:3.5.7] {code}
> Here's the structure of my cluster
> N0: ZK0, HMaster
> N1: ZK1, Regionserver1
> N1: ZK2, Regionserver2
> N_100: HDFS
> This error happen when I upgrade the HBase cluster, the zookeeper cluster
> also gets a restart.
> The error message happens rarely. Considering its ERROR level, I am not sure
> whether it will cause other issues. But the cluster still seems to be working
> correctly. I noticed that the send() code remains the same in the new
> version. I suspect it might also happen in the latest version. If it's
> benign, would it be better to be output as WARN level?
> I have attached my full logs (persistent.tar.gz). The specific error occurred
> in hbase--zookeeper-8db357045302.log.
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