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  • Ignite Persistent Store - under the hood

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WAL file segments and rotation structure is shown at the picture below:

 

 


A number of segments may be not needed anymore (depending on History Size setting). Old fashion WAL History size setting is set in checkpoints number (See also WAL history size section below), the new one is set in bytes.  History size setting is mentioned here https://apacheignite.readme.io/docs/write-ahead-log#section-wal-archive

Local Recovery Process

Let’s assume node start process is running with existent files.

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