[jira] [Created] (HBASE-21492) CellCodec Written To WAL Before It's Verified

["BELUGA BEHR (JIRA)" <ji...@apache.org>]

BELUGA BEHR created HBASE-21492:
-----------------------------------

             Summary: CellCodec Written To WAL Before It's Verified
                 Key: HBASE-21492
                 URL: https://issues.apache.org/jira/browse/HBASE-21492
             Project: HBase
          Issue Type: Improvement
          Components: wal
    Affects Versions: 2.0.2, 1.2.7
            Reporter: BELUGA BEHR


The cell codec class name is written into the WAL file, but the cell codec class is not actually verified to exist.  Therefore, users can inadvertently configure an invalid class name and it will be recorded into the WAL file.  At that point, the WAL file becomes unreadable and blocks processing of all other WAL files.

{code:java|title=AbstractProtobufLogWriter.java}
  private WALHeader buildWALHeader0(Configuration conf, WALHeader.Builder builder) {
    if (!builder.hasWriterClsName()) {
      builder.setWriterClsName(getWriterClassName());
    }
    if (!builder.hasCellCodecClsName()) {
      builder.setCellCodecClsName(WALCellCodec.getWALCellCodecClass(conf));
    }
    return builder.build();
  }
{code}


https://github.com/apache/hbase/blob/025ddce868eb06b4072b5152c5ffae5a01e7ae30/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/wal/AbstractProtobufLogWriter.java#L78-L86



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