Shulou(Shulou.com)06/02 Report--

This article introduces the relevant knowledge of "what to do if the Java program gets stuck". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

1. Get field fault information jstack 6688

The parameter is PID. When we look at the stack information, we find that there is no class related to our own program, but we find the following sentence:

"Druid-ConnectionPool-Create-418179060" # 25 daemon prio=5 os_prio=0 tid=0x00007fa74d8ad000 nid=0x15a84 waiting on condition [0x00007fa6f8a30000] java.lang.Thread.State: WAITING (parking) at sun.misc.Unsafe.park (Native Method)-parking to wait for (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject) at java.util.concurrent.locks.LockSupport.park (LockSupport.java:175) at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await (AbstractQueuedSynchronizer.java: 2039) at com.alibaba.druid.pool.DruidDataSource$CreateConnectionThread.run (DruidDataSource.java:2480)

Oh, it turns out that Druid is waiting for the thread to get stuck, so what should I do?

two。 Retrieve the solution according to the printed information

Started using Bing to search and found this discussion: thread stuck on druiddatasource

3. Try based on the information retrieved

Since it was mentioned in the discussion that it might be related to the version, I checked the version I used and found that the version was very new and the possibility of problems was very small. Then increase the maximum active number to carry on the experiment. I found that after increasing the maximum number of active users, I used the top command to query. Sure enough, the cpu occupancy rate was no longer very low, and cpu began to run happily. Passed this concurrent number of stress tests.

4. Other useful ideas

If you can't find the desired results in Chinese, try to search in English.

If you have tried three solutions and failed or have tried for half a working day, please report to the next level immediately or consult the experienced personnel around you (the job is not a training ground, the most important thing to solve the problem).

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