IceBerg HDFS

Iceberg is an open-source table format for Apache Hadoop that is designed to improve the management and querying of large datasets stored in Hadoop’s HDFS (Hadoop Distributed File System). Iceberg provides a structured and efficient way to store data tables in HDFS while offering features like schema evolution, efficient snapshots, and partition pruning. Here are some key points about Iceberg and its relationship with HDFS:

1. Table Format: Iceberg introduces a table format that organizes data into tables, schemas, and partitions. It provides a higher-level abstraction for working with data in HDFS, making it easier to manage and query structured data.

2. Schema Evolution: One of the notable features of Iceberg is its support for schema evolution. This means you can evolve the schema of your data tables over time without breaking existing queries or data compatibility.

3. Efficient Snapshots: Iceberg enables the creation of efficient snapshots of data tables. Snapshots are a point-in-time view of the table and can be used for data versioning, auditing, and efficient backup and restore operations.

4. Partitioning: Iceberg supports partitioning of data tables based on one or more columns. This enables efficient data pruning and improves query performance by only scanning the necessary data partitions.

5. Transactional Writes: Iceberg provides support for ACID (Atomicity, Consistency, Isolation, Durability) transactions, allowing you to perform atomic and consistent data writes.

6. Metadata Management: Iceberg maintains metadata about tables, including schema information, partitioning details, and snapshot history. This metadata is stored in a separate location in HDFS and can be used for table discovery and management.

7. Query Engines: You can use popular query engines like Apache Hive, Apache Spark, and Presto to interact with Iceberg tables, making it compatible with a wide range of Hadoop ecosystem tools.

8. Open Source: Iceberg is an open-source project that is actively maintained and developed by the community. It is available as a library for Java and Python.