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Apache Ignite needs to support running SQL queries from disk without loading them in memory and, in general, be fully operational even if all the data is on disk.
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Watch the recording of the Apache Ignite Community meetup to quickly grasp the benefits, specificities, architecture and implementation details of the store.
The main purpose of the Persistent Store is to provide data persistence and fault-tolerance, i.e. no data should ever be lost regardless of any type of failures.
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Apache Ignite will maintain a separate a WAL
file for every cacheall caches. The The purpose of a the WAL
file is to provide a fast and efficient mechanism to store the latest recovery mechanism for the transactional data stored on disk.
WAL
update details:
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