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When we open a backup cursor and return documents via the $backupCursor aggregation command, documents currently have the following formats depending on the type of backup.
- Incremental backups return one document per unchanged file with the format:
{
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filename: String,
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fileSize: Number
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}
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- Incremental backups return multiple documents (one document per block, where each block has a default size of 16MB) per changed file with the format:
{
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filename: String,
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fileSize: Number,
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offset: Number,
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length: Number
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}
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We should make this format more consistent by returning document with the following format regardless of the type of backup.
{
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filename: String,
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fileSize: Number,
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offset: Number,
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length: Number
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}
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In the case of non-incremental backups and the first full backup used as the basis for future incremental backups, offset=0 and length=0 would clearly indicate the type of backup. Since this involves additive changes to the backup API, it should require few changes from downstream teams like Cloud Backup.
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