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Posted to notifications@iotdb.apache.org by "Houliang Qi (Jira)" <ji...@apache.org> on 2021/02/04 02:58:00 UTC

[jira] [Created] (IOTDB-1147) Concurrent bug error in FlushManager may cause NoSuchElementException error

Houliang Qi created IOTDB-1147:
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             Summary: Concurrent bug error in FlushManager may cause NoSuchElementException error
                 Key: IOTDB-1147
                 URL: https://issues.apache.org/jira/browse/IOTDB-1147
             Project: Apache IoTDB
          Issue Type: Bug
          Components: Core/Engine
            Reporter: Houliang Qi
             Fix For: 0.12.0
         Attachments: image-2021-02-04-10-57-43-980.png, image-2021-02-04-10-57-53-288.png

When we flush one tsfile, we put the TsFileProcessor to the FlushManager, and use another thread pool to do the flush task of the memtables in this TsFileProcessor.

 

Howerver, the following codes is not thread safe, because when the first code 

_tsFileProcessorQueue.isEmpty()_ is called, it may be return false, but instantly it maybe become empty due to consumed by the flush thread pool, so when called 

t_sFileProcessorQueue.getFirst().getStorageGroupName()_  it may cause  NoSuchElementException error.

!image-2021-02-04-10-52-19-911.png!

The error are as follows:

 

!image-2021-02-04-10-56-04-613.png!



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