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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-5823) Store Checkpoint Root Metadata in StateBackend (not in HA custom store)
Date Wed, 10 Jan 2018 18:14:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-5823?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16320757#comment-16320757
] 

ASF GitHub Bot commented on FLINK-5823:
---------------------------------------

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

    https://github.com/apache/flink/pull/5248#discussion_r160756970
  
    --- Diff: flink-runtime/src/main/java/org/apache/flink/runtime/state/CheckpointStorage.java
---
    @@ -0,0 +1,93 @@
    +/*
    + * 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.flink.runtime.state;
    +
    +import javax.annotation.Nullable;
    +
    +import java.io.IOException;
    +
    +/**
    + * CheckpointStorage implements the durable storage of checkpoint data and metadata streams.
    + * An individual checkpoint or savepoint is stored to a {@link CheckpointStorageLocation},
    + * created by this class.
    + */
    +public interface CheckpointStorage {
    +
    +	/**
    +	 * Checks whether this backend supports highly available storage of data.
    +	 *
    +	 * <p>Some state backends may offer support for that with default settings, which
makes them
    +	 * suitable for zero-config prototyping, but not for actual production setups.
    +	 */
    +	boolean supportsHighlyAvailableStorage();
    +
    +	/**
    +	 * Checks whether the storage has a default savepoint location configured.
    +	 */
    +	boolean hasDefaultSavepointLocation();
    +
    +	/**
    +	 * Resolves the given pointer to a checkpoint/savepoint into a state handle from which
the
    +	 * checkpoint metadata can be read. If the state backend cannot understand the format
of
    +	 * the pointer (for example because it was created by a different state backend) this
method
    +	 * should throw an {@code IOException}.
    +	 *
    +	 * @param pointer The pointer to resolve.
    +	 * @return The state handler from which one can read the checkpoint metadata.
    +	 *
    +	 * @throws IOException Thrown, if the state backend does not understand the pointer,
or if
    +	 *                     the pointer could not be resolved due to an I/O error.
    +	 */
    +	StreamStateHandle resolveCheckpoint(String pointer) throws IOException;
    +
    +	/**
    +	 * Initializes a storage location for new checkpoint with the given ID.
    +	 *
    +	 * <p>The returned storage location can be used to write the checkpoint data and
metadata
    +	 * to and to obtain the pointers for the location(s) where the actual checkpoint data
should be
    +	 * stored.
    +	 *
    +	 * @param checkpointId The ID (logical timestamp) of the checkpoint that should be persisted.
    +	 * @return A storage location for the data and metadata of the given checkpoint.
    +	 *
    +	 * @throws IOException Thrown if the storage location cannot be initialized due to an
I/O exception.
    +	 */
    +	CheckpointStorageLocation initializeCheckpoint(long checkpointId) throws IOException;
    --- End diff --
    
    How about `initializeLocationForCheckpoint`?


> Store Checkpoint Root Metadata in StateBackend (not in HA custom store)
> -----------------------------------------------------------------------
>
>                 Key: FLINK-5823
>                 URL: https://issues.apache.org/jira/browse/FLINK-5823
>             Project: Flink
>          Issue Type: Sub-task
>          Components: State Backends, Checkpointing
>            Reporter: Stephan Ewen
>            Assignee: Stephan Ewen
>            Priority: Blocker
>             Fix For: 1.5.0
>
>




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