oceanbase / oceanbase/obkv-table-client-java

[Bug]: The Direct-Load API has some non-daemon threads that cannot end normally, causing the JVM to be unable to exit normally.

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Dominant language
Java
Stars
32
Forks
25
Avg merge
10h 32m
Merged PRs (30d)
2

Description

Describe the bug

The Direct-Load API has some non-daemon threads that cannot end normally, causing the JVM to be unable to exit normally.

Environment

master branch:088b828

version:1.3.1-SNAPSHOT

Fast reproduce steps

Using Direct-Load API for multi node write

  • Jstack log
"pool-35-thread-1" #84 prio=5 os_prio=31 tid=0x000000013f8a3800 nid=0xc703 waiting on condition [0x0000000306652000]
   java.lang.Thread.State: TIMED_WAITING (parking)
	at sun.misc.Unsafe.park(Native Method)
	- parking to wait for  <0x00000006c22dcba0> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
	at java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:215)
	at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2083)
	at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:1093)
	at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:809)
	at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1074)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1134)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:750)

   Locked ownable synchronizers:
	- None

"pool-34-thread-1" #83 prio=5 os_prio=31 tid=0x000000013f8a2800 nid=0xec03 waiting on condition [0x0000000306446000]
   java.lang.Thread.State: TIMED_WAITING (parking)
	at sun.misc.Unsafe.park(Native Method)
	- parking to wait for  <0x00000006c22a9a70> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
	at java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:215)
	at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2083)
	at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:1093)
	at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:809)
	at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1074)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1134)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:750)

   Locked ownable synchronizers:
	- None
  • After troubleshooting, it was caused by the following thread pool.
    • com.alipay.oceanbase.rpc.table.ObTable.ObTableConnectionPool#cleanerExecutor
Expected behavior

No response

Actual behavior

No response

Additional context

No response

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by inspecting com.alipay.oceanbase.rpc.table.ObTable.ObTableConnectionPool, especially cleanerExecutor, and reproduce a multi-node Direct-Load API write while collecting a jstack log. Done means the non-daemon threads can terminate normally and the JVM exits after the Direct-Load operation completes.

Written by the indexing model from the issue text.

Assessment

Tech stack
java
Domain
backend, databases
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
30/100

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