private void writeMaxSequenceIdFile(MasterProcedureEnv env) throws IOException {
    MasterFileSystem fs = env.getMasterFileSystem();
    long maxSequenceId = WALSplitUtil.getMaxRegionSequenceId(env.getMasterConfiguration(),
      getParentRegion(), fs::getFileSystem, fs::getWALFileSystem);
    if (maxSequenceId > 0) {
      WALSplitUtil.writeRegionSequenceIdFile(fs.getWALFileSystem(),
        getWALRegionDir(env, daughterOneRI), maxSequenceId);
      WALSplitUtil.writeRegionSequenceIdFile(fs.getWALFileSystem(),
        getWALRegionDir(env, daughterTwoRI), maxSequenceId);
    }
  }
Post split region actions
@param env MasterProcedureEnv
hbase-server/src/main/java/org/apache/hadoop/hbase/master/assignment/SplitTableRegionProcedure.java