private static long getCellsPerTimeoutCheck(Configuration conf) {
    long perHeartbeat = conf.getLong(StoreScanner.HBASE_CELLS_SCANNED_PER_HEARTBEAT_CHECK,
      StoreScanner.DEFAULT_HBASE_CELLS_SCANNED_PER_HEARTBEAT_CHECK);
    return perHeartbeat > 0
      ? perHeartbeat
      : StoreScanner.DEFAULT_HBASE_CELLS_SCANNED_PER_HEARTBEAT_CHECK;
  }
@param family             {@link ColumnFamilyDescriptor} describing the column family
@param ttl                Store's TTL (in ms)
@param timeToPurgeDeletes duration in ms after which a delete marker can be purged during a
                          major compaction.
@param comparator         The store's comparator
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/ScanInfo.java