hqbhoho created IMPALA-8975:
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Summary: Impala use Hive UDF with Mysql , there are to many
Abandoned connection cleanup thread in Impalad
Key: IMPALA-8975
URL: https://issues.apache.org/jira/browse/IMPALA-8975
Project: IMPALA
Issue Type: Bug
Components: Backend
Affects Versions: Impala 2.11.0
Reporter: hqbhoho
[arthas@93773]$ thread | grep Abandoned connection cleanup | wc -l
there is 2K+ threads (Abandoned connection cleanup thread) which thread state
is timed_wating in impalad
for example：
[arthas@93773]$ thread 262
"Abandoned connection cleanup thread" Id=262 TIMED_WAITING on
java.lang.ref.ReferenceQueue$Lock@17b40f38
at java.lang.Object.wait(Native Method)
- waiting on java.lang.ref.ReferenceQueue$Lock@17b40f38
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:143)
at
com.mysql.jdbc.AbandonedConnectionCleanupThread.run(AbandonedConnectionCleanupThread.java:64)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
Number of locked synchronizers = 1
- java.util.concurrent.ThreadPoolExecutor$Worker@2edcbdc4
Affect(row-cnt:0) cost in 87 ms.
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