[jira] [Created] (HADOOP-11938) Fix ByteBuffer version encode/decode API of raw erasure coder

["Kai Zheng (JIRA)" <ji...@apache.org>]

Kai Zheng created HADOOP-11938:
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             Summary: Fix ByteBuffer version encode/decode API of raw erasure coder
                 Key: HADOOP-11938
                 URL: https://issues.apache.org/jira/browse/HADOOP-11938
             Project: Hadoop Common
          Issue Type: Sub-task
            Reporter: Kai Zheng
            Assignee: Kai Zheng


While investigating a test failure in {{TestRecoverStripedFile}}, one issue in raw erasrue coder, a bad optimization in below codes. It assumes the  heap buffer backed by the bytes array available for reading or writing always starts with zero and takes the whole.
{code}
  protected static byte[][] toArrays(ByteBuffer[] buffers) {
    byte[][] bytesArr = new byte[buffers.length][];

    ByteBuffer buffer;
    for (int i = 0; i < buffers.length; i++) {
      buffer = buffers[i];
      if (buffer == null) {
        bytesArr[i] = null;
        continue;
      }

      if (buffer.hasArray()) {
        bytesArr[i] = buffer.array();
      } else {
        throw new IllegalArgumentException("Invalid ByteBuffer passed, " +
            "expecting heap buffer");
      }
    }

    return bytesArr;
  }
{code} 



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