[GitHub] [incubator-doris] 924060929 opened a new issue #5335: [Bug] ScalaValueReader throw TApplicationException: get_next failed: out of sequence response: expected 21 but got 20

[GitBox]

924060929 opened a new issue #5335:
URL: https://github.com/apache/incubator-doris/issues/5335


   **Describe the bug**
   
   When I use spark on doris with config 
`doris.deserialize.arrow.async=true`，ScalaValueReader throw 
TApplicationException: get_next failed: out of sequence response: expected 21 
but got 20.
   
   And then, ScalaValueReader will **block forever**
   
   This is because, when `doris.deserialize.arrow.async=true`, `get_next()` 
will invoke in **asyncThread**，but `close()` will invoke in **current thread**, 
the sequence will encounter race condition 
   
   **To Reproduce**
   run
   ``` scala
   val sparkSettings = new SparkSettings(sparkConf)
   sparkSettings.setProperty("doris.deserialize.arrow.async", "true")
   val partitions = RestService.findPartitions(sparkSettings, logger)
   val reader = new ScalaDorisRowValueReader(partitions.get(0), 
partitions.get(0).settings())
   while (reader.hasNext) {
     val nextBatch = reader.next // invoke in asyncThread
   }
   reader.close() // invoke in current thread
   ```
   
   **Expected behavior**
   No exception
   
   **Screenshots**
   
![image](https://user-images.githubusercontent.com/8806055/106432600-e8a04400-64a9-11eb-8dba-1e6cac4135a9.png)
   
   **Desktop (please complete the following information):**
   None
   
   **Smartphone (please complete the following information):**
   None
   
   **Additional context**
   None
   


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