CentOS HDFS data backup method

Detailed explanation of HDFS data backup plan under CentOS system

This article will introduce several commonly used CentOS system HDFS data backup methods, policies and tools to help you protect valuable data efficiently and securely.

HDFS backup method

• HDFS Snapshot: The HDFS snapshot function can create read-only copies of file systems or directories at specific points in time to enable data backup. This feature is a key feature of HDFS, allowing users to create read-only images of the file system at any time.
• Erasure Coding: Erasure Coding is a data fault-tolerant encoding technology that provides the same fault-tolerant capabilities as data replication at a lower storage cost. In Hadoop 3 and above, erasure codes are the default alternative to copy solutions.
• Distributed replication tool DistCp: DistCp is an efficient data replication tool that can be used to replicate massive data between HDFS clusters, supporting full and incremental backups.

Backup strategy recommendations

Developing a reasonable HDFS backup strategy is crucial and the following factors need to be considered:

• Data scope: Define the data type and scope that need to be backed up.
• Backup frequency and retention time: Set appropriate backup cycle and data retention time according to data importance and update frequency.
• Backup tool selection: Select the appropriate backup tool, such as rsync, tar, etc., as well as the tools that come with HDFS.
• Backup storage location: Select the appropriate backup storage location, such as local storage or cloud storage.

Common backup tools

• tar: Used to create backup images of the entire system.
• rsync: supports incremental backup of files, efficiently saving storage space.
• DistCp: Designed for large-scale data replication between HDFS clusters, supporting full and incremental backups.

Be sure to formulate appropriate backup strategies based on actual data importance, update frequency and business needs, and regularly test the data recovery process to ensure the integrity and reliability of backups.

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