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https://issues.apache.org/jira/browse/HDFS-17764?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17942349#comment-17942349
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ASF GitHub Bot commented on HDFS-17764:
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programmerfromxian commented on PR #7551:
URL: https://github.com/apache/hadoop/pull/7551#issuecomment-2791471802
Although conn.interrupt method is called, but normally this method will wait
thread execute finish, so method conn.close may can be called. I will close
this pull request and check if other possibilities. @Hexiaoqiao @szetszwo
,thanks for reviews.
> Connection#stop is blocking when FileSystem#close
> -------------------------------------------------
>
> Key: HDFS-17764
> URL: https://issues.apache.org/jira/browse/HDFS-17764
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: common
> Affects Versions: 3.3.1, 3.4.1
> Reporter: yang yang
> Priority: Major
> Labels: pull-request-available
> Attachments: image-2025-03-28-17-04-50-157.png
>
>
> When call FileSystem.close, we found it was blocked，and thread stack is like
> following
> {quote}"http-nio-uds-exec-9" #88 daemon prio=5 os_prio=0 cpu=92.85ms
> elapsed=180245.91s tid=0x000055d7d9c6a800 nid=0x8ff in Object.wait()
> [0x00007ff473b79000]
> java.lang.Thread.State: WAITING (on object monitor)
> at java.lang.Object.wait(Native Method)
> at java.lang.Object.wait(Object.java:502)
> at org.apache.hadoop.ipc.Client.stop(Client.java:1438)
> - locked <0x00000000f5b44b80> (a java.lang.Object)
> at org.apache.hadoop.ipc.ClientCache.stopClient(ClientCache.java:118)
> at
> org.apache.hadoop.ipc.ProtobufRpcEngine2$Invoker.close(ProtobufRpcEngine2.java:340)
> at org.apache.hadoop.ipc.RPC.stopProxy(RPC.java:719)
> at
> org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolTranslatorPB.close(ClientNamenodeProtocolTranslatorPB.java:340)
> at
> org.apache.hadoop.hdfs.server.namenode.ha.ConfiguredFailoverProxyProvider.close(ConfiguredFailoverProxyProvider.java:81)
> - locked <0x00000000f500e278> (a
> org.apache.hadoop.hdfs.server.namenode.ha.ConfiguredFailoverProxyProvider)
> at
> org.apache.hadoop.io.retry.RetryInvocationHandler$ProxyDescriptor.close(RetryInvocationHandler.java:239)
> at
> org.apache.hadoop.io.retry.RetryInvocationHandler.close(RetryInvocationHandler.java:457)
> at org.apache.hadoop.ipc.RPC.stopProxy(RPC.java:719)
> at
> org.apache.hadoop.hdfs.DFSClient.closeConnectionToNamenode(DFSClient.java:664)
> at org.apache.hadoop.hdfs.DFSClient.close(DFSClient.java:710)
> - locked <0x00000000f32b8048> (a org.apache.hadoop.hdfs.DFSClient)
> at
> org.apache.hadoop.hdfs.DistributedFileSystem.close(DistributedFileSystem.java:1573)
> {quote}
>
> !image-2025-03-28-17-04-50-157.png!
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