[jira] [Created] (HBASE-9870) HFileDataBlockEncoderImpl#diskToCacheFormat uses wrong format

["Jimmy Xiang (JIRA)" <ji...@apache.org>]

Jimmy Xiang created HBASE-9870:
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             Summary: HFileDataBlockEncoderImpl#diskToCacheFormat uses wrong format
                 Key: HBASE-9870
                 URL: https://issues.apache.org/jira/browse/HBASE-9870
             Project: HBase
          Issue Type: Bug
            Reporter: Jimmy Xiang


In this method, we have

{code}
    if (block.getBlockType() == BlockType.ENCODED_DATA) {
      if (block.getDataBlockEncodingId() == onDisk.getId()) {
        // The block is already in the desired in-cache encoding.
        return block;
      }
{code}

This assumes onDisk encoding is the same as that of inCache.  This is not true when we change the encoding of a CF.  This could be one of the reasons I got data loss with online encoding change?

If I make sure onDisk == inCache all the time, my ITBLL with online encoding change worked once for me.



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