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https://issues.apache.org/jira/browse/IOTDB-319?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jialin Qiao closed IOTDB-319.
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Fix Version/s: 0.9.0
Resolution: Fixed
> 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
> Priority: Major
> Labels: hard, pull-request-available
> Fix For: 0.9.0
>
> Attachments: deadlock.out
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> 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:
> =============================
> "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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