Github user anmolnar commented on a diff in the pull request:

    https://github.com/apache/zookeeper/pull/377#discussion_r170008461
  
    --- Diff: src/java/main/org/apache/zookeeper/server/OldEphemeralType.java 
---
    @@ -0,0 +1,74 @@
    +/**
    + * Licensed to the Apache Software Foundation (ASF) under one
    + * or more contributor license agreements.  See the NOTICE file
    + * distributed with this work for additional information
    + * regarding copyright ownership.  The ASF licenses this file
    + * to you under the Apache License, Version 2.0 (the
    + * "License"); you may not use this file except in compliance
    + * with the License.  You may obtain a copy of the License at
    + * <p/>
    + * http://www.apache.org/licenses/LICENSE-2.0
    + * <p/>
    + * Unless required by applicable law or agreed to in writing, software
    + * distributed under the License is distributed on an "AS IS" BASIS,
    + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    + * See the License for the specific language governing permissions and
    + * limitations under the License.
    + */
    +
    +package org.apache.zookeeper.server;
    +
    +/**
    + * See https://issues.apache.org/jira/browse/ZOOKEEPER-2901
    + *
    + * version 3.5.3 introduced bugs associated with how TTL nodes were 
implemented. version 3.5.4
    + * fixes the problems but makes TTL nodes created in 3.5.3 invalid. 
OldEphemeralType is a copy
    + * of the old - bad - implementation that is provided as a workaround. 
{@link EphemeralType#TTL_3_5_3_EMULATION_PROPERTY}
    + * can be used to emulate support of the badly specified TTL nodes.
    + */
    +public enum OldEphemeralType {
    +    /**
    +     * Not ephemeral
    +     */
    +    VOID,
    +    /**
    +     * Standard, pre-3.5.x EPHEMERAL
    +     */
    +    NORMAL,
    +    /**
    +     * Container node
    +     */
    +    CONTAINER,
    +    /**
    +     * TTL node
    +     */
    +    TTL;
    +
    +    public static final long CONTAINER_EPHEMERAL_OWNER = Long.MIN_VALUE;
    +    public static final long MAX_TTL = 0x0fffffffffffffffL;
    +    public static final long TTL_MASK = 0x8000000000000000L;
    +
    +    public static OldEphemeralType get(long ephemeralOwner) {
    --- End diff --
    
    Yes, that's fine with the emulate353 flag.
    My concern is that we keep 2 enums in the codebase: `EphemeralType` and 
`OldEphemeralType` while I think it'd be nicer to build the functionality of 
the old enum into the new one.


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