*/
public synchronized byte[][] rollHLogWriter(String serverName)
throws IOException, FailedLogCloseException {
ServerName sn = ServerName.valueOf(serverName);
AdminService.BlockingInterface admin = this.connection.getAdmin(sn);
RollWALWriterRequest request = RequestConverter.buildRollWALWriterRequest();
try {
RollWALWriterResponse response = admin.rollWALWriter(null, request);
int regionCount = response.getRegionToFlushCount();
byte[][] regionsToFlush = new byte[regionCount][];
for (int i = 0; i < regionCount; i++) {