@Before
  public void setUp() throws IOException {
    CONF.setBoolean(HConstants.ENABLE_WAL_COMPRESSION, isCompressionEnabled);
    initWAL();
  }
Try out different combinations of row count and KeyValue count
hbase-server/src/test/java/org/apache/hadoop/hbase/replication/regionserver/TestWALEntryStreamDifferentCounts.java