yang yang created HDFS-17764:
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Summary: 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: 3.4.1, 3.3.1
Reporter: yang yang
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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