NDB_PRINT_FRAG_FILE(1)

NAME
ndb_print_frag_file - print NDB Fragment List File contents

SYNOPSIS

ndb_print_frag_file file_name

DESCRIPTION

ndb_print_frag_file obtains information from a cluster fragment list file. It is intended for use in helping to diagnose issues with data node restarts. Usage

    ndb_print_frag_file file_name

file_name is the name of a cluster fragment list file, which matches the pattern SX.FragList, where X is a digit in the range 2-9 inclusive, and are found in the data node file system of the data node having the node ID nodeid, in directories named ndb_nodeid_fs/DN/DBDIH/, where N is 1 or 2. Each fragment file contains records of the fragments belonging to each NDB table. For more information about cluster fragment files, see NDB Cluster Data Node File System Directory[1].

Like ndb_print_backup_file, ndb_print_sys_file, and ndb_print_schema_file (and unlike most of the other NDB utilities that are intended to be run on a management server host or to connect to a management server), ndb_print_frag_file 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. Additional Options

None. Sample Output

    shell> ndb_print_frag_file /usr/local/mysqld/data/ndb_3_fs/D1/DBDIH/S2.FragList
    Filename: /usr/local/mysqld/data/ndb_3_fs/D1/DBDIH/S2.FragList with size 8192
    noOfPages = 1 noOfWords = 182
    Table Data
    ----------
    Num Frags: 2 NoOfReplicas: 2 hashpointer: 4294967040
    kvalue: 6 mask: 0x00000000 method: HashMap
    Storage is on Logged and checkpointed, survives SR
    ------ Fragment with FragId: 0 --------
    Preferred Primary: 2 numStoredReplicas: 2 numOldStoredReplicas: 0 distKey: 0 LogPartId: 0
    -------Stored Replica----------
    Replica node is: 2 initialGci: 2 numCrashedReplicas = 0 nextLcpNo = 1
    LcpNo[0]: maxGciCompleted: 1 maxGciStarted: 2 lcpId: 1 lcpStatus: valid
    LcpNo[1]: maxGciCompleted: 0 maxGciStarted: 0 lcpId: 0 lcpStatus: invalid
    -------Stored Replica----------
    Replica node is: 3 initialGci: 2 numCrashedReplicas = 0 nextLcpNo = 1
    LcpNo[0]: maxGciCompleted: 1 maxGciStarted: 2 lcpId: 1 lcpStatus: valid
    LcpNo[1]: maxGciCompleted: 0 maxGciStarted: 0 lcpId: 0 lcpStatus: invalid
    ------ Fragment with FragId: 1 --------
    Preferred Primary: 3 numStoredReplicas: 2 numOldStoredReplicas: 0 distKey: 0 LogPartId: 1
    -------Stored Replica----------
    Replica node is: 3 initialGci: 2 numCrashedReplicas = 0 nextLcpNo = 1
    LcpNo[0]: maxGciCompleted: 1 maxGciStarted: 2 lcpId: 1 lcpStatus: valid
    LcpNo[1]: maxGciCompleted: 0 maxGciStarted: 0 lcpId: 0 lcpStatus: invalid
    -------Stored Replica----------
    Replica node is: 2 initialGci: 2 numCrashedReplicas = 0 nextLcpNo = 1
    LcpNo[0]: maxGciCompleted: 1 maxGciStarted: 2 lcpId: 1 lcpStatus: valid
    LcpNo[1]: maxGciCompleted: 0 maxGciStarted: 0 lcpId: 0 lcpStatus: invalid

COPYRIGHT

Copyright © 1997, 2021, Oracle and/or its affiliates.

This documentation is free software; you can redistribute it and/or modify it only under the terms of the GNU General Public License as published by the Free Software Foundation; version 2 of the License.

This documentation is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with the program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or see http://www.gnu.org/licenses/.

NOTES

1.  NDB Cluster Data Node File System Directory
    https://dev.mysql.com/doc/ndb-internals/en/ndb-internals-ndbd-filesystemdir-files.html

SEE ALSO
For more information, please refer to the MySQL Reference Manual, which may already be installed locally and which is also available online at http://dev.mysql.com/doc/.

AUTHOR
Oracle Corporation (http://dev.mysql.com/).