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MySQL 5.7 Reference Manual  /  ...  /  ndbd_redo_log_reader — Check and Print Content of Cluster Redo Log

20.4.20 ndbd_redo_log_reader — Check and Print Content of Cluster Redo Log

Reads a redo log file, checking it for errors, printing its contents in a human-readable format, or both. ndbd_redo_log_reader is intended for use primarily by NDB Cluster developers and Support personnel in debugging and diagnosing problems.

This utility remains under development, and its syntax and behavior are subject to change in future NDB Cluster releases.

The C++ source files for ndbd_redo_log_reader can be found in the directory /storage/ndb/src/kernel/blocks/dblqh/redoLogReader.

The following table includes options that are specific to the NDB Cluster program ndbd_redo_log_reader. Additional descriptions follow the table. For options common to most NDB Cluster programs (including ndbd_redo_log_reader), see Section 20.4.28, “Options Common to NDB Cluster Programs — Options Common to NDB Cluster Programs”.

Table 20.97 This table describes command-line options for the ndbd_redo_log_reader program

Format Description Added or Removed


Do not print records

All MySQL 5.7 based releases


Do not check records for errors

All MySQL 5.7 based releases


Print usage information

All MySQL 5.7 based releases


ndbd_redo_log_reader file_name [options]

file_name is the name of a cluster redo log file. redo log files are located in the numbered directories under the data node's data directory (DataDir); the path under this directory to the redo log files matches the pattern ndb_#_fs/D#/LCP/#/T#F#.Data. In each case, the # represents a number (not necessarily the same number). For more information, see NDB Cluster Data Node File System Directory Files.

The name of the file to be read may be followed by one or more of the options listed here:

  • Command-Line Format-noprint
    Permitted ValuesTypeboolean

    -noprint: Do not print the contents of the log file.

  • Command-Line Format-nocheck
    Permitted ValuesTypeboolean

    -nocheck: Do not check the log file for errors.

  • Command-Line Format--help

    --help: Print usage information.

Like ndb_print_backup_file and ndb_print_schema_file (and unlike most of the NDB utilities that are intended to be run on a management server host or to connect to a management server) ndbd_redo_log_reader must be run on a cluster data node, since it accesses the data node file system directly. Because it does not make use of the management server, this utility can be used when the management server is not running, and even when the cluster has been completely shut down.

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