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https://issues.apache.org/jira/browse/HDFS-17952?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Xiaoqiao He resolved HDFS-17952.
--------------------------------
Resolution: Not A Problem
> standby namenode restart,datanode failed to connect
> ----------------------------------------------------
>
> Key: HDFS-17952
> URL: https://issues.apache.org/jira/browse/HDFS-17952
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: datanode
> Affects Versions: 2.9.2
> Reporter: Jepon
> Priority: Major
>
> {*}{color:#4c9aff}Environment：{color}{*}1、Back up all nodes'
> $HADOOP_HOME/share/hadoop/hdfs/hadoop-hdfs-2.9.2.jar files directly to bak
> and upload the latest jar file.
> 2、Apache Hadoop 2.9.2 setup with two Namenode nodes (NN1 as standby, NN2 as
> active).
> *After restarting NN1, the system shows 83 DN nodes with 82 successfully
> registered DN links, but one DN node fails to establish a connection with
> NN1, triggering an error:*
> 2026-07-13 18:24:12,159 INFO org.apache.hadoop.ipc.Client: Retrying connect
> to server: bdpprd01/10.1.1.1:9000. Already tried 0 time(s); retry policy is
> RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000
> MILLISECONDS)
> 2026-07-13 18:24:13,159 INFO org.apache.hadoop.ipc.Client: Retrying connect
> to server: bdpprd01/10.1.1.1:9000. Already tried 1 time(s); retry policy is
> RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000
> MILLISECONDS)
> 2026-07-13 18:24:14,159 INFO org.apache.hadoop.ipc.Client: Retrying connect
> to server: bdpprd01/10.1.1.1:9000. Already tried 2 time(s); retry policy is
> RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000
> MILLISECONDS)
> 2026-07-13 18:24:15,160 INFO org.apache.hadoop.ipc.Client: Retrying connect
> to server: bdpprd01/10.1.1.1:9000. Already tried 3 time(s); retry policy is
> RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000
> MILLISECONDS)
> 2026-07-13 18:24:16,160 INFO org.apache.hadoop.ipc.Client: Retrying connect
> to server: bdpprd01/10.1.1.1:9000. Already tried 4 time(s); retry policy is
> RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000
> MILLISECONDS)
> 2026-07-13 18:24:17,160 INFO org.apache.hadoop.ipc.Client: Retrying connect
> to server: bdpprd01/10.1.1.1:9000. Already tried 5 time(s); retry policy is
> RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000
> MILLISECONDS)
> 2026-07-13 18:24:18,161 INFO org.apache.hadoop.ipc.Client: Retrying connect
> to server: bdpprd01/10.1.1.1:9000. Already tried 6 time(s); retry policy is
> RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000
> MILLISECONDS)
> 2026-07-13 18:24:19,161 INFO org.apache.hadoop.ipc.Client: Retrying connect
> to server: bdpprd01/10.1.1.1:9000. Already tried 7 time(s); retry policy is
> RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000
> MILLISECONDS)
> 2026-07-13 18:24:20,162 INFO org.apache.hadoop.ipc.Client: Retrying connect
> to server: bdpprd01/10.1.1.1:9000. Already tried 8 time(s); retry policy is
> RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000
> MILLISECONDS)
> 2026-07-13 18:24:21,162 INFO org.apache.hadoop.ipc.Client: Retrying connect
> to server: bdpprd01/10.1.1.1:9000. Already tried 9 time(s); retry policy is
> RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000
> MILLISECONDS)
> 2026-07-13 18:24:22,492 WARN org.apache.hadoop.hdfs.server.datanode.DataNode:
> Unexpected exception in block pool Block pool
> BP-383332234-10.1.1.1-1584640173217 (Datanode Uuid
> 213c4874-89c5-40d5-8a61-db4dbcd0439c) service to bdpprd01/10.1.1.1:9000
> {color:#de350b}java.lang.NoClassDefFoundError:
> org/apache/hadoop/hdfs/protocol/UnregisteredNodeException{color}
> at
> org.apache.hadoop.hdfs.server.datanode.BPServiceActor.offerService(BPServiceActor.java:717)
> at
> org.apache.hadoop.hdfs.server.datanode.BPServiceActor.run(BPServiceActor.java:841)
> at java.lang.Thread.run(Thread.java:748)
> 2026-07-13 18:24:22,492 WARN org.apache.hadoop.hdfs.server.datanode.DataNode:
> Ending block pool service for: Block pool BP-383332234-10.1.1.1-1584640173217
> (Datanode Uuid 213c4874-89c5-40d5-8a61-db4dbcd0439c) service to
> bdpprd01/10.1.1.1:9000
> But，Check the bak Jar's source code; this
> {color:#de350b}UnregisteredNodeException {color}class exists.
> Why?
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