* The range has just been truncated. If the first bucket's first vlsn
* != the first in range, insert a GhostBucket.
*/
Long firstKey = buckets.firstKey();
VLSNBucket firstBucket = buckets.get(firstKey);
VLSN firstRangeVLSN = range.getFirst();
VLSN firstBucketVLSN = firstBucket.getFirst();
if (!firstBucketVLSN.equals(firstRangeVLSN)) {
long nextFile =
envImpl.getFileManager().getFollowingFileNum(deleteFileNum,
true /* forward */);
long lastPossibleLsn = firstBucket.getLsn(firstBucketVLSN);
VLSNBucket placeholder = new GhostBucket(firstRangeVLSN,