Learn about Hudi caching technology

Hudi is an open source data lake solution that provides a comprehensive toolset for managing, processing, and analyzing data volumes stored in large-scale data lakes. One of Hudi's core features is caching, which helps users manage data loading, querying, and partitioning more efficiently.

Hudi caching technology works by maintaining a set of data copies in memory to improve the speed and response time of data access. When a user queries data, Hudi first checks whether a copy of the data exists in memory, and if so, returns it directly to the user. If the data copy is not in memory, the data is read from disk and the data copy is added to the in-memory cache. This way, in subsequent queries, the data will be accessed faster.

In Hudi caching technology, data is divided into multiple blocks, each block is usually 1MB in size. Each data block is keyed by its unique identifier and stored in an in-memory hash table. When the user queries data, the hash table will find the corresponding data block based on the key value of the data block, and then load the data block into memory for query. This method can improve the speed of data access and also achieve a balance in memory space usage.

In addition to memory caching, Hudi also provides disk-based caching functionality. This caching method saves memory space by caching data blocks on disk. This caching mechanism can effectively expand the cache capacity of data and also reduce the occurrence of problems such as memory leaks. Hudi also provides a complete data cleaning mechanism, which can clean up the data block in time after it expires to avoid the adverse impact of data expiration on the system.

In general, Hudi's caching technology is a very practical feature that can help users effectively manage and process massive data. Whether it is used for data analysis or data mining, caching is a very important link. Hudi's caching technology not only improves data access speed, but also ensures data accuracy and reliability. If you need to handle large-scale data and need to process and query the data efficiently and quickly, Hudi caching technology will be a very good choice.

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