[jira] [Created] (HBASE-17872) Make ByteBufferUtils thread-safe

["Chia-Ping Tsai (JIRA)" <ji...@apache.org>]

Chia-Ping Tsai created HBASE-17872:
--------------------------------------

             Summary: Make ByteBufferUtils thread-safe
                 Key: HBASE-17872
                 URL: https://issues.apache.org/jira/browse/HBASE-17872
             Project: HBase
          Issue Type: Bug
            Reporter: Chia-Ping Tsai
            Assignee: Chia-Ping Tsai
            Priority: Critical


A case is shown below.
We will get the wrong position of buffer in multithreaded environment, so the method makes the invalid cell in MSLAB.
{noformat}
  public static int copyFromBufferToBuffer(ByteBuffer in, ByteBuffer out, int sourceOffset,
      int destinationOffset, int length) {
    if (in.hasArray() && out.hasArray()) {
      // ...
    } else if (UNSAFE_AVAIL) {
      // ...
    } else {
      int outOldPos = out.position();
      out.position(destinationOffset);
      ByteBuffer inDup = in.duplicate();
      inDup.position(sourceOffset).limit(sourceOffset + length);
      out.put(inDup);
      out.position(outOldPos);
    }
    return destinationOffset + length;
  }
{noformat}



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