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class ConsistentCutMarkerFinishMessage extends ConsistentCutMarkerMessage {
    @Nullable ConsistentCutMarker txMarker;
}

WAL records

There are 2 records: ConsistentCutStartRecord  for Start event and ConsistentCutFinishRecord for Finish event. 

• ConsistentCutStartRecord: record is written to WAL in moment when ConsistentCut starts on a local node. It helps to limit amout of active transactions to check. But there is no strict guarantee for all transactions belonged to the BEFORE side to be committed before ConsistentCutStartRecord, and vice versa. This is the reason for having ConsistentCutFinishRecord.
• ConsistentCutFinishRecord: This record is written to WAL after Consistent Cut stopped analyzing active transactions and storing them in a particular bucket (BEFORE or AFTER).

...

/** */
public class ConsistentCutStartRecord extends WALRecord {
	/** Marker that inits Consistent Cut. */
	private final ConsistentCutMarker marker;
}


/** */
public class ConsistentCutFinishRecord extends WALRecord {
    /**
     * Collections of TXs committed BEFORE the ConsistentCut (sent - received).
     */
    private final Set<GridCacheVersion> before;

     /**
     * Collections of TXs committed AFTER the ConsistentCut (exclude).
     */
    private final Set<GridCacheVersion> after;
 }

Links

1. ON DISTRIBUTED SNAPSHOTS, Ten H. LAI and Tao H. YANG, 29 May 1987