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While the demander node is in the partition file transmission state it must save all cache entries corresponding to the moving partition into a new temporary WAL storage. When the partition file completely received these entries will be applied on it one by one. Asynchronous operations are written to the end of temporary WAL storage until it becomes empty. The file-based FIFO approach assume to be used by this process.

The new write-ahead-log manager for writing temporary records must support to:

• Unlimited number of wal-files to store temporary data records;
• Iterating over stored data records during an asynchronous writer thread inserts new records;
• WAL-per-partiton approach need to be used;

The process description on the demander node – items 2, 10 of the Process Overview.

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