Interface CheckpointMetadata

The IDs of the parent checkpoints. Mapping from checkpoint namespace to checkpoint ID.

The source of the checkpoint.

• "input": The checkpoint was created from an input to invoke/stream/batch.
• "loop": The checkpoint was created from inside the pregel loop.
• "update": The checkpoint was created from a manual state update.
• "fork": The checkpoint was created as a copy of another checkpoint.

The step number of the checkpoint. -1 for the first "input" checkpoint. 0 for the first "loop" checkpoint. ... for the nth checkpoint afterwards.

The writes that were made between the previous checkpoint and this one. Mapping from node name to writes emitted by that node.