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From "Andrew Sherman (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (HIVE-19395) OutStream.write hangs with misconfigured bufferSize
Date Thu, 21 Jun 2018 23:23:00 GMT

     [ https://issues.apache.org/jira/browse/HIVE-19395?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Andrew Sherman reassigned HIVE-19395:
-------------------------------------

    Assignee: Andrew Sherman

> OutStream.write hangs with misconfigured bufferSize
> ---------------------------------------------------
>
>                 Key: HIVE-19395
>                 URL: https://issues.apache.org/jira/browse/HIVE-19395
>             Project: Hive
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 1.0.0
>            Reporter: John Doe
>            Assignee: Andrew Sherman
>            Priority: Minor
>
> When the bufferSize is configured to be 0 in the class initialization, the while loop
in OutStream.write function hangs endlessly.
> This is because when the bufferSize is 0, current.remaining is 0, length will always
> 0.
> Here is the code snippet.
> {code:java}
>    OutStream(String name, int bufferSize, CompressionCodec codec, OutputReceiver receiver)
throws IOException {
>     ...
>     this.bufferSize = bufferSize; //bufferSize can be configured with 0
>     ...
>   }
>     private void getNewInputBuffer() throws IOException {
>       ...
>       current = ByteBuffer.allocate(bufferSize);
>       ...
>   }
>   public void write(byte[] bytes, int offset, int length) throws IOException {
>     if (current == null) {
>       getNewInputBuffer();
>     }
>     int remaining = Math.min(current.remaining(), length);
>     current.put(bytes, offset, remaining);
>     uncompressedBytes += remaining;
>     length -= remaining;
>     while (length != 0) {//length > 0
>       spill();
>       offset += remaining;
>       remaining = Math.min(current.remaining(), length);//current.remaining() == 0
>       current.put(bytes, offset, remaining);
>       uncompressedBytes += remaining;
>       length -= remaining;
>     }
>   }
> {code}
> The similar case is HDFS-13513, HDFS-13514



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