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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (APEXMALHAR-1897) Create ManagedState
Date Sun, 20 Mar 2016 18:45:33 GMT

    [ https://issues.apache.org/jira/browse/APEXMALHAR-1897?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15203429#comment-15203429
] 

ASF GitHub Bot commented on APEXMALHAR-1897:
--------------------------------------------

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

    https://github.com/apache/incubator-apex-malhar/pull/145#discussion_r56769401
  
    --- Diff: library/src/main/java/com/datatorrent/lib/state/managed/AbstractManagedStateImpl.java
---
    @@ -0,0 +1,499 @@
    +/**
    + * 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 com.datatorrent.lib.state.managed;
    +
    +import java.io.IOException;
    +import java.util.Comparator;
    +import java.util.Map;
    +import java.util.concurrent.Callable;
    +import java.util.concurrent.ExecutorService;
    +import java.util.concurrent.Executors;
    +import java.util.concurrent.atomic.AtomicReference;
    +
    +import javax.validation.constraints.Min;
    +import javax.validation.constraints.NotNull;
    +
    +import org.joda.time.Duration;
    +import org.slf4j.Logger;
    +import org.slf4j.LoggerFactory;
    +
    +import com.esotericsoftware.kryo.serializers.FieldSerializer;
    +import com.esotericsoftware.kryo.serializers.JavaSerializer;
    +import com.google.common.annotations.VisibleForTesting;
    +import com.google.common.base.Preconditions;
    +import com.google.common.base.Throwables;
    +import com.google.common.collect.Maps;
    +
    +import com.datatorrent.api.Component;
    +import com.datatorrent.api.Context.DAGContext;
    +import com.datatorrent.api.Context.OperatorContext;
    +import com.datatorrent.api.Operator;
    +import com.datatorrent.api.annotation.Stateless;
    +import com.datatorrent.common.util.NameableThreadFactory;
    +import com.datatorrent.lib.fileaccess.FileAccess;
    +import com.datatorrent.lib.fileaccess.TFileImpl;
    +import com.datatorrent.lib.util.comparator.SliceComparator;
    +import com.datatorrent.netlet.util.Slice;
    +
    +/**
    + * An abstract implementation of managed state.<br/>
    + *
    + * The important sub-components here are:
    + * <ol>
    + *   <li>
    + *     {@link #checkpointManager}: writes incremental checkpoints in window files and
transfers data from window
    + *     files to bucket files.
    + *   </li>
    + *   <li>
    + *     {@link #bucketsFileSystem}: a bucket on disk is sub-divided into time-buckets.
This manages meta-bucket
    + *     information (list of {@link BucketsFileSystem.TimeBucketMeta}) per bucket.
    + *   </li>
    + *   <li>
    + *     {@link #timeBucketAssigner}: assigns time-buckets to keys and manages the time
boundaries.
    + *   </li>
    + *   <li>
    + *     {@link #stateTracker}: tracks the size of data in memory and requests buckets
to free memory when enough memory
    + *     is not available.
    + *   </li>
    + *   <li>
    + *     {@link #fileAccess}: plug-able file system abstraction.
    + *   </li>
    + * </ol>
    + *
    + * The implementations of put, getSync and getAsync here use windowId as the time field
to derive timeBucket of a key.
    --- End diff --
    
    This comment seems to belong in ManagedStateImpl


> Create ManagedState
> -------------------
>
>                 Key: APEXMALHAR-1897
>                 URL: https://issues.apache.org/jira/browse/APEXMALHAR-1897
>             Project: Apache Apex Malhar
>          Issue Type: Sub-task
>            Reporter: Chandni Singh
>            Assignee: Chandni Singh
>             Fix For: 3.4.0
>
>
> ManagedState is described in the document below:
> https://docs.google.com/document/d/1gRWN9ufKSZSZD0N-pthlhpC9TZ8KwJ6hJlAX6nxl5f8/edit#heading=h.z87ti1fwyt0t



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