private Put createPutForWriteRegionServerLogTimestamp(TableName table, byte[] smap,
    String backupRoot) {
    Put put = new Put(rowkey(TABLE_RS_LOG_MAP_PREFIX, backupRoot, NULL, table.getNameAsString()));
    put.addColumn(BackupSystemTable.META_FAMILY, Bytes.toBytes("log-roll-map"), smap);
    return put;
  }
Creates Put to write RS last roll log timestamp map
@param table table
@param smap  map, containing RS:ts
@return put operation
hbase-backup/src/main/java/org/apache/hadoop/hbase/backup/impl/BackupSystemTable.java