Santhoshkumar Nagulanchi created CAMEL-24273:
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             Summary: After every SFTP transfer, the number of daemon threads 
increases.
                 Key: CAMEL-24273
                 URL: https://issues.apache.org/jira/browse/CAMEL-24273
             Project: Camel
          Issue Type: Bug
          Components: camel-sftp
    Affects Versions: 4.18.1
         Environment: RHEL 8, Spring Boot 3.5.12,

Apache Camel  4.18.1 

Apache Camel Mina SFTP 4.18.1 

SSHD 2.17.1. ( shipped with Camel Mina ) 
            Reporter: Santhoshkumar Nagulanchi


Tried Apache Camel 4.18.1 with camel-mina-sftp (Apache SSHD 2.17.1) on Java 21. 
After every SFTP transfer, the number of daemon threads increases. Observed 
additional {{Thread-N}} (EPoll event threads) and {{sshd-SshClient[*]-nio2-*}} 
threads that remain alive after the transfer completes. Over time, the thread 
count continuously grows instead of stabilizing. Even though the route is 
stopped and removed after each transfer, Finally its reaching systems ulimit 
and not allowing any other process to spin up in that system.

 

1. SshClient[565db404]-nio2-resume-thread-1  #62 [686892] daemon prio=5 
os_prio=0 cpu=69.20ms elapsed=494.47s

2. SshClient[565db404]-timer-thread-1  #63 [686893] daemon prio=5 os_prio=0 
cpu=4.58ms elapsed=494.43s

3. SshClient[565db404]-nio2-thread-1  #64 [686894] daemon prio=5 os_prio=0 
cpu=301.96ms elapsed=494.42s

4. SshClient[565db404]-nio2-thread-2  #65 [686895] daemon prio=5 os_prio=0 
cpu=335.27ms elapsed=494.41s

5. SshClient[565db404]-nio2-thread-3  #66 [686896] daemon prio=5 os_prio=0 
cpu=328.26ms elapsed=494.37s

6. SshClient[565db404]-nio2-resume-thread-2  #69 [686923] daemon prio=5 
os_prio=0 cpu=27.94ms elapsed=492.39s

7. SshClient[565db404]-nio2-resume-thread-3  #70 [686924] daemon prio=5 
os_prio=0 cpu=27.48ms elapsed=491.66s

8. SshClient[5b9d0fd7]-nio2-resume-thread-1  #82 [700246] daemon prio=5 
os_prio=0 cpu=24.43ms elapsed=85.00s

9. SshClient[5b9d0fd7]-timer-thread-1  #83 [700247] daemon prio=5 os_prio=0 
cpu=3.80ms elapsed=85.00s

10. SshClient[5b9d0fd7]-nio2-thread-1  #84 [700248] daemon prio=5 os_prio=0 
cpu=240.13ms elapsed=84.99s

11. SshClient[5b9d0fd7]-nio2-thread-2  #85 [700249] daemon prio=5 os_prio=0 
cpu=236.69ms elapsed=84.99s

12. SshClient[5b9d0fd7]-nio2-thread-3  #86 [700250] daemon prio=5 os_prio=0 
cpu=236.31ms elapsed=84.98s

13. SshClient[5b9d0fd7]-nio2-resume-thread-2  #88 [700605] daemon prio=5



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