NetBackup™ for Hadoop Administrator's Guide

Last Published:
Product(s): NetBackup (10.3)
  1. Introduction
    1.  
      Protecting Hadoop data using NetBackup
    2.  
      Backing up Hadoop data
    3.  
      Restoring Hadoop data
    4.  
      NetBackup for Hadoop terms
    5.  
      Limitations
  2. Prerequisites and best practices for the Hadoop plug-in for NetBackup
    1.  
      About deploying the Active Directory plug-in
    2. Prerequisites for the Hadoop plug-in
      1.  
        Operating system and platform compatibility
      2.  
        License for Hadoop plug-in for NetBackup
    3.  
      Preparing the Hadoop cluster
    4.  
      Best practices for deploying the Hadoop plug-in
  3. Configuring NetBackup for Hadoop
    1.  
      About configuring NetBackup for Hadoop
    2. Managing backup hosts
      1.  
        Including a NetBackup client on NetBackup primary server allowed list
      2.  
        Configure a NetBackup Appliance as a backup host
    3.  
      Adding Hadoop credentials in NetBackup
    4. Configuring the Hadoop plug-in using the Hadoop configuration file
      1.  
        Configuring NetBackup for a highly-available Hadoop cluster
      2.  
        Configuring a custom port for the Hadoop cluster
      3.  
        Configuring number of threads for backup hosts
      4.  
        Configuring number of streams for backup hosts
      5.  
        Configuring distribution algorithm and golden ratio for backup hosts
      6. Configuring communication between NetBackup and Hadoop clusters that are SSL-enabled (HTTPS)
        1.  
          ECA_TRUST_STORE_PATH for NetBackup servers and clients
        2.  
          ECA_CRL_PATH for NetBackup servers and clients
        3.  
          HADOOP_SECURE_CONNECT_ENABLED for servers and clients
        4.  
          HADOOP_CRL_CHECK for NetBackup servers and clients
        5.  
          Example values for the parameters in the bp.conf file
    5.  
      Configuration for a Hadoop cluster that uses Kerberos
    6.  
      Hadoop.conf configuration for parallel restore
    7.  
      Create a BigData policy for Hadoop clusters
    8.  
      Disaster recovery of a Hadoop cluster
  4. Performing backups and restores of Hadoop
    1. About backing up a Hadoop cluster
      1.  
        Prerequisites for running backup and restore operations for a Hadoop cluster with Kerberos authentication
      2.  
        Best practices for backing up a Hadoop cluster
      3.  
        Backing up a Hadoop cluster
    2. About restoring a Hadoop cluster
      1.  
        Best practices for restoring a Hadoop cluster
      2. Restoring Hadoop data on the same Hadoop cluster
        1.  
          Restore Hadoop data on the same Hadoop cluster
      3.  
        Restoring Hadoop data on an alternate Hadoop cluster
    3.  
      Best practice for improving performance during backup and restore
  5. Troubleshooting
    1.  
      About troubleshooting NetBackup for Hadoop issues
    2.  
      About NetBackup for Hadoop debug logging
    3. Troubleshooting backup issues for Hadoop data
      1.  
        Backup operation fails with error 6609
      2.  
        Backup operation failed with error 6618
      3.  
        Backup operation fails with error 6647
      4.  
        Extended attributes (xattrs) and Access Control Lists (ACLs) are not backed up or restored for Hadoop
      5.  
        Backup operation fails with error 6654
      6.  
        Backup operation fails with bpbrm error 8857
      7.  
        Backup operation fails with error 6617
      8.  
        Backup operation fails with error 6616
      9.  
        Backup operation fails with error 84
      10.  
        NetBackup configuration and certificate files do not persist after the container-based NetBackup appliance restarts
      11.  
        Unable to see incremental backup images during restore even though the images are seen in the backup image selection
      12.  
        One of the child backup jobs goes in a queued state
    4. Troubleshooting restore issues for Hadoop data
      1.  
        Restore fails with error code 2850
      2.  
        NetBackup restore job for Hadoop completes partially
      3.  
        Extended attributes (xattrs) and Access Control Lists (ACLs) are not backed up or restored for Hadoop
      4.  
        Restore operation fails when Hadoop plug-in files are missing on the backup host
      5.  
        Restore fails with bpbrm error 54932
      6.  
        Restore operation fails with bpbrm error 21296
      7.  
        Hadoop with Kerberos restore job fails with error 2850
      8.  
        Configuration file is not recovered after a disaster recovery
  6.  
    Index

Backup operation fails with error 6647

Backup operation fails with error 6647 wherein the following error is displayed:

Unable to create or access a directory or a path. (6647)

This error is encountered in one of the following scenarios:

  • Directory is not snapshot-enabled.

  • Policy is configured to take snapshot of the root folder as backup selection, whereas one of the child folder is already snapshot-enabled.

  • Policy is configured to take snapshot of a child folder as backup selection, whereas one of the parent folder is already snapshot-enabled.

  • Policy is configured to take snapshot of a file as backup selection

Workaround:

Nested snapshot-enabled directories are not allowed in Hadoop. If the parent directory is already a snapshot-enabled, than any other child directory under the parent directory cannot be enabled for snapshot. For backup selection in Bigdata policy type, only snapshot-enabled directory must be selected for backup and any other child directories must not be selected.