xiangdong Huang created IOTDB-319:
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Summary: java deadlock (not sure how to reproduce)
Key: IOTDB-319
URL: https://issues.apache.org/jira/browse/IOTDB-319
Project: Apache IoTDB
Issue Type: Bug
Affects Versions: 0.9.0
Reporter: xiangdong Huang
Attachments: deadlock.out
Hi,
my colleague gives me an IoTDB instance which has no response for "select " SQL.
(but for Schema query sql, it works).
I used jstack to check the process and find a deadlock, you can get the
detailed info in the attachment.
Found one Java-level deadlock:
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"pool-2-IoTDB-JDBC-Client-thread-16":
waiting to lock monitor 0x00007fdab800ff68 (object 0x00000003c7163218, a
org.apache.iotdb.db.query.control.FileReaderManager),
which is held by "pool-2-IoTDB-JDBC-Client-thread-3"
"pool-2-IoTDB-JDBC-Client-thread-3":
waiting for ownable synchronizer 0x00000003c6106f40, (a
java.util.concurrent.locks.ReentrantReadWriteLock$NonfairSync),
which is held by "MergeThread-0"
"MergeThread-0":
waiting to lock monitor 0x00007fdab800ff68 (object 0x00000003c7163218, a
org.apache.iotdb.db.query.control.FileReaderManager),
which is held by "pool-2-IoTDB-JDBC-Client-thread-3"
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