private static void scanFreeRecords() {
final int filelength = (int)getRecords().length();
- LOG.assertTrue(filelength % RECORD_SIZE == 0);
+ LOG.assertTrue(filelength % RECORD_SIZE == 0, "invalid file size: " + filelength);
int count = filelength / RECORD_SIZE;
for (int n = 2; n < count; n++) {