org.apache.curator.framework.api.ProtectACLCreateModePathAndBytesable Maven / Gradle / Ivy
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/**
* 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
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* 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.curator.framework.api;
public interface ProtectACLCreateModePathAndBytesable extends
ACLBackgroundPathAndBytesable,
CreateModable>
{
/**
*
* Hat-tip to https://github.com/sbridges for pointing this out
*
*
*
* It turns out there is an edge case that exists when creating sequential-ephemeral
* nodes. The creation can succeed on the server, but the server can crash before
* the created node name is returned to the client. However, the ZK session is still
* valid so the ephemeral node is not deleted. Thus, there is no way for the client to
* determine what node was created for them.
*
*
*
* Even without sequential-ephemeral, however, the create can succeed on the sever
* but the client (for various reasons) will not know it.
*
*
*
* Putting the create builder into protection mode works around this.
* The name of the node that is created is prefixed with a GUID. If node creation fails
* the normal retry mechanism will occur. On the retry, the parent path is first searched
* for a node that has the GUID in it. If that node is found, it is assumed to be the lost
* node that was successfully created on the first try and is returned to the caller.
*
*
* @return this
*/
public ACLCreateModeBackgroundPathAndBytesable withProtection();
}