@Override
        public void postSync(final long timeInNanos, final int handlerSyncs) {
          syncMeter.mark();
          syncHistogram.update(timeInNanos);
          syncCountHistogram.update(handlerSyncs);
        }
Verify the content of the WAL file. Verify that the file has expected number of edits.
@param wals may not be null
@return Count of edits.
hbase-diagnostics/src/main/java/org/apache/hadoop/hbase/wal/WALPerformanceEvaluation.java