Nemo Chen created HDFS-10752:
--------------------------------

             Summary: Variable in byte printed directly in hdfs
                 Key: HDFS-10752
                 URL: https://issues.apache.org/jira/browse/HDFS-10752
             Project: Hadoop HDFS
          Issue Type: Bug
    Affects Versions: 2.7.2
            Reporter: Nemo Chen


Similar to the fix for HBASE-623, in file:

hadoop-rel-release-2.7.2/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/BackupImage.java

In the following method, the log printed variable data (in byte[]). A possible 
fix is add Bytes.toString(data).
{code}
/**
   * Write the batch of edits to the local copy of the edit logs.
   */
  private void logEditsLocally(long firstTxId, int numTxns, byte[] data) {
    long expectedTxId = editLog.getLastWrittenTxId() + 1;
    Preconditions.checkState(firstTxId == expectedTxId,
        "received txid batch starting at %s but expected txn %s",
        firstTxId, expectedTxId);
    editLog.setNextTxId(firstTxId + numTxns - 1);
    editLog.logEdit(data.length, data);
    editLog.logSync();
  }
{code}



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