HDFS-9853. Ozone: Add container definitions. Contributed by Anu Engineer.
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Anu Engineer
Owen O'Malley
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/**
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.apache.hadoop.ozone;
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/**
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This package contains class that support ozone implementation on the datanode
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side.
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Main parts of ozone on datanode are:
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1. REST Interface - This code lives under the web directory and listens to the
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WebHDFS port.
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2. Datanode container classes: This support persistence of ozone objects on
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datanode. These classes live under container directory.
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3. Client and Shell: We also support a ozone REST client lib, they are under
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web/client and web/ozShell.
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*/
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/**
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/**
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* These .proto interfaces are private and Unstable.
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* Please see http://hadoop.apache.org/docs/stable/hadoop-project-dist/hadoop-common/InterfaceClassification.html
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* for what changes are allowed for a *Unstable* .proto interface.
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*/
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// This file contains protocol buffers that are used to transfer data
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// to and from the datanode.
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option java_package = "org.apache.hadoop.hdfs.ozone.protocol.proto";
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option java_outer_classname = "ContainerProtos";
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option java_generate_equals_and_hash = true;
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package hadoop.hdfs.ozone;
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import "hdfs.proto";
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/**
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* Commands that are used to manipulate the state of containers on a datanode.
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*
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* These commands allow us to work against the datanode - from
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* StorageContainer Manager as well as clients.
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*
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* 1. CreateContainer - This call is usually made by Storage Container
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* manager, when we need to create a new container on a given datanode.
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*
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* 2. ReadContainer - Allows end user to stat a container. For example
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* this allows us to return the metadata of a container.
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*
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* 3. UpdateContainer - Updates a container metadata.
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* 4. DeleteContainer - This call is made to delete a container.
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*
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* 5. ListContainer - Returns the list of containers on this
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* datanode. This will be used by tests and tools.
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*
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* 6. CreateKey - Given a valid container, creates a key.
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*
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* 7. ReadKey - Allows user to read the metadata of a Key.
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*
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* 8. UpdateKey - Updates the metadata of a Key.
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*
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* 9. DeleteKey - Deletes a given key.
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*
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* 10. ListKey - Returns a list of keys that are present inside
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* a given container.
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*
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* 11. ReadChunk - Allows us to read a chunk.
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*
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* 12. DeleteChunk - Delete an unused chunk.
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*
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* 13. WriteChunk - Allows us to write a chunk
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*
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* 14. ListChunk - Given a Container/Key returns the list of Chunks.
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*
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*/
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enum Type {
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CreateContainer = 1;
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ReadContainer = 2;
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UpdateContainer = 3;
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DeleteContainer = 4;
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ListContainer = 5;
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CreateKey = 6;
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Readkey = 7;
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UpdateKey = 8;
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DeleteKey = 9;
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ListKey = 10;
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ReadChunk = 11;
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DeleteChunk = 12;
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WriteChunk = 13;
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ListChunk = 14;
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}
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message ContainerCommandRequestProto {
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required Type cmdType = 1; // Type of the command
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// A string that identifies this command, we generate Trace ID in Ozone
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// frontend and this allows us to trace that command all over ozone.
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optional string traceID = 2;
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// One of the following command is available when the corresponding
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// cmdType is set. At the protocol level we allow only
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// one command in each packet.
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// TODO : Upgrade to Protobuf 2.6 or later.
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optional CreateContainerRequestProto createContainer = 3;
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optional ReadContainerRequestProto readContainer = 4;
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optional UpdateContainerRequestProto updateContainer = 5;
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optional DeleteContainerRequestProto deleteContainer = 6;
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optional ListContainerRequestProto listContainer = 7;
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optional CreateKeyRequestProto createKey = 8;
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optional ReadKeyRequestProto readKey = 9;
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optional UpdateKeyRequestProto updateKey = 10;
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optional DeleteKeyRequestProto deleteKey = 11;
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optional ListKeyRequestProto listKey = 12;
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optional ReadChunkRequestProto readChunk = 13;
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optional WriteChunkRequestProto writeChunk = 14;
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optional DeleteChunkRequestProto deleteChunk = 15;
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optional ListChunkRequestProto listChunk = 16;
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}
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message ContainerCommandResponseProto {
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required Type cmdType = 1;
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optional string traceID = 2;
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optional CreateContainerResponseProto createContainer = 3;
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optional ReadContainerResponseProto readContainer = 4;
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optional UpdateContainerResponseProto updateContainer = 5;
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optional DeleteContainerResponseProto deleteContainer = 6;
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optional ListContainerResponseProto listContainer = 7;
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optional CreateKeyResponseProto createKey = 8;
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optional ReadKeyResponeProto readKey = 9;
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optional UpdateKeyResponseProto updateKey = 10;
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optional DeleteKeyResponeProto deleteKey = 11;
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optional ListKeyResponeProto listKey = 12;
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optional WriteChunkReponseProto writeChunk = 13;
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optional ReadChunkReponseProto readChunk = 14;
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optional DeleteChunkResponseProto deleteChunk = 15;
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optional ListChunkResponseProto listChunk = 16;
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}
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// A pipeline is composed of one or more datanodes that back a container.
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message Pipeline {
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required string leaderID = 1;
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repeated DatanodeIDProto members = 2;
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optional string containerName = 3;
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}
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message KeyValue {
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required string key = 1;
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optional string value = 2;
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}
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message ContainerData {
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required string name = 1;
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repeated KeyValue metadata = 2;
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optional string containerPath = 3;
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}
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// Container Messages.
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message CreateContainerRequestProto {
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required Pipeline pipeline = 1;
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required ContainerData containerData = 2;
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}
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message CreateContainerResponseProto {
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}
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message ReadContainerRequestProto {
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required Pipeline pipeline = 1;
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required string name = 2;
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}
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message ReadContainerResponseProto {
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optional ContainerData containerData = 2;
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}
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message UpdateContainerRequestProto {
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required Pipeline pipeline = 1;
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required ContainerData containerData = 2;
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}
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message UpdateContainerResponseProto {
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}
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message DeleteContainerRequestProto {
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required Pipeline pipeline = 1;
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required string name = 2;
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}
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message DeleteContainerResponseProto {
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}
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message ListContainerRequestProto {
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required Pipeline pipeline = 1;
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optional string prevKey = 2; // if this is not set query from start.
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required uint32 count = 3; // Max Results to return
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}
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message ListContainerResponseProto {
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repeated ContainerData containerData = 1;
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}
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message ContainerKeyData {
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optional string containerName = 1;
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required string name = 2;
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repeated KeyValue metadata = 3;
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}
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// Key Messages.
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message CreateKeyRequestProto {
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required Pipeline pipeline = 1;
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required ContainerKeyData containerKeyData = 2;
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}
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message CreateKeyResponseProto {
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}
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message ReadKeyRequestProto {
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required Pipeline pipeline = 1;
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required ContainerKeyData containerKeyData = 2;
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}
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message ReadKeyResponeProto {
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repeated KeyValue metadata = 1;
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repeated chunkInfo chunkData = 2;
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}
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message UpdateKeyRequestProto {
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required Pipeline pipeline = 1;
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required ContainerKeyData containerKeyData = 2;
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}
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message UpdateKeyResponseProto {
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}
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message DeleteKeyRequestProto {
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required Pipeline pipeline = 1;
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required string name = 2;
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}
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message DeleteKeyResponeProto {
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}
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message ListKeyRequestProto {
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required Pipeline pipeline = 1;
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required string prevKey = 2;
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required uint32 count = 3;
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}
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message ListKeyResponeProto {
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repeated ContainerKeyData containerKeyData = 1;
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}
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// Chunk Operations
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message chunkInfo {
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required uint64 offset = 1;
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required uint64 len = 2;
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optional uint64 checksum = 3;
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repeated KeyValue metadata = 4;
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}
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message WriteChunkRequestProto {
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required Pipeline pipeline = 1;
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required string containerName = 2;
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required string keyName = 3;
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required chunkInfo chunkData = 4;
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repeated bytes data = 5;
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}
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message WriteChunkReponseProto {
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}
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message ReadChunkRequestProto {
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required Pipeline pipeline = 1;
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required string containerName = 2;
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required string keyName = 3;
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required chunkInfo chunkData = 4;
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}
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message ReadChunkReponseProto {
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required Pipeline pipeline = 1;
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required chunkInfo chunkData = 2;
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repeated bytes data = 3;
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}
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message DeleteChunkRequestProto {
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required Pipeline pipeline = 1;
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required string containerName = 2;
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required string keyName = 3;
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required chunkInfo chunkData = 4;
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}
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message DeleteChunkResponseProto {
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}
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message ListChunkRequestProto {
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required Pipeline pipeline = 1;
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required string containerName = 2;
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required string keyName = 3;
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required uint64 startOffset = 4;
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required uint32 count = 5;
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}
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message ListChunkResponseProto {
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repeated chunkInfo chunkData = 1;
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}
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