private HRegionForTest createTable() throws Exception {
    TableDescriptor tableDescriptor = TableDescriptorBuilder.newBuilder(tableName)
      .setColumnFamily(ColumnFamilyDescriptorBuilder.of(FAMILY)).build();
    HTU.getAdmin().createTable(tableDescriptor);
    HRegionServer rs = HTU.getMiniHBaseCluster().getRegionServer(0);
    return (HRegionForTest) rs.getRegions(tableName).get(0);
  }
The {@link WAL#sync} would timeout and throws {@link WALSyncTimeoutIOException},when
{@link HRegion#doWALAppend} catches this exception it aborts the RegionServer.
hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/wal/TestWALSyncTimeoutException.java