Github user tweise commented on a diff in the pull request:
https://github.com/apache/incubator-apex-malhar/pull/145#discussion_r48513313
--- Diff:
library/src/main/java/com/datatorrent/lib/state/managed/AbstractManagedStateImpl.java
---
@@ -0,0 +1,487 @@
+/**
+ * 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.lang.reflect.Array;
+import java.util.Comparator;
+import java.util.Map;
+import java.util.Timer;
+import java.util.TimerTask;
+import java.util.concurrent.Callable;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.Future;
+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.base.Preconditions;
+import com.google.common.collect.Maps;
+import com.google.common.collect.MinMaxPriorityQueue;
+import com.google.common.util.concurrent.Futures;
+
+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.DTThrowable;
+import com.datatorrent.netlet.util.Slice;
+
+/**
+ * Not thread safe.
+ */
+public abstract class AbstractManagedStateImpl
+ implements ManagedState, Operator, Operator.CheckpointListener,
ManagedStateContext
+{
+ private long maxCacheSize;
+
+ protected int numBuckets;
+
+ private int incrementalCheckpointWindowCount =
DAGContext.CHECKPOINT_WINDOW_COUNT.defaultValue;
+
+ @NotNull
+ private FileAccess fileAccess = new TFileImpl.DTFileImpl();
+ @NotNull
+ protected TimeBucketAssigner timeBucketAssigner = new
TimeBucketAssigner();
+
+ protected Bucket[] buckets;
+
+ private StateTracker tracker;
+
+ @Min(1)
+ private int numReaders = 10;
+ @NotNull
+ protected transient ExecutorService readerService;
+
+ @NotNull
+ private final BucketsDataManager dataManager = new
BucketsDataManager(this);
+
+ private final BucketsMetaDataManager bucketsMetaDataManager = new
BucketsMetaDataManager(this);
+
+ private transient int operatorId;
+ private transient long windowId;
+
+ private transient int windowCount;
+
+ private transient long largestRecoveryWindow;
+ protected transient boolean replay;
+
+ @NotNull
+ protected Comparator<Slice> keyComparator = new SliceComparator();
+
+ protected final transient AtomicReference<Throwable> throwable = new
AtomicReference<>();
+
+ @NotNull
+ @FieldSerializer.Bind(JavaSerializer.class)
+ private Duration checkStateSizeInterval = Duration.millis(
+ DAGContext.STREAMING_WINDOW_SIZE_MILLIS.defaultValue *
OperatorContext.APPLICATION_WINDOW_COUNT.defaultValue);
+
+ private transient StateTracker stateTracker;
+
+ private final transient Object commitLock = new Object();
+
+ @SuppressWarnings("unchecked")
+ @Override
+ public void setup(OperatorContext context)
+ {
+ operatorId = context.getId();
+ fileAccess.init();
+ timeBucketAssigner.register(dataManager);
+ timeBucketAssigner.setup(context);
+
+ numBuckets = getNumBuckets();
+ buckets = (Bucket[])Array.newInstance(Bucket.class, numBuckets);
+
+ Preconditions.checkArgument(numReaders <= numBuckets, "no. of readers
cannot exceed no. of buckets");
+ //setup state data manager
+ dataManager.setup(context);
+
+ //recovering data for window files to bucket
+ try {
+ Map<Long, Map<Slice, Bucket.BucketedValue>> recovered =
dataManager.load(operatorId);
+ if (recovered != null && !recovered.isEmpty()) {
+
+ for (Map.Entry<Long, Map<Slice, Bucket.BucketedValue>> entry :
recovered.entrySet()) {
+ int bucketIdx = prepareBucket(entry.getKey());
+
+ for (Map.Entry<Slice, Bucket.BucketedValue> dataEntry :
entry.getValue().entrySet()) {
+ buckets[bucketIdx].put(dataEntry.getKey(),
dataEntry.getValue().getTimeBucket(),
+ dataEntry.getValue().getValue());
+ }
+ }
+ }
+ } catch (IOException e) {
+ throw new RuntimeException("recovering", e);
+ }
+
+ largestRecoveryWindow = dataManager.getLargestRecoveryWindow();
+ long activationWindow =
context.getValue(OperatorContext.ACTIVATION_WINDOW_ID);
+
+ if (activationWindow != Stateless.WINDOW_ID && largestRecoveryWindow
<= activationWindow) {
+ replay = true;
+ }
+
+ readerService = Executors.newFixedThreadPool(numReaders, new
NameableThreadFactory("managedStateReaders"));
+
+ stateTracker = new StateTracker(this, throwable);
+ stateTracker.setup(context);
+ }
+
+ public abstract int getNumBuckets();
+
+ @Override
+ public void beginWindow(long l)
+ {
+ if (throwable.get() != null) {
+ throw DTThrowable.wrapIfChecked(throwable.get());
+ }
+
+ windowCount++;
+ timeBucketAssigner.beginWindow(l);
+ if (replay && l > largestRecoveryWindow) {
+ replay = false;
+ }
+ }
+
+ @Override
+ public void put(long groupId, Slice key, Slice value)
+ {
+ if (replay) {
+ return;
+ }
+ int bucketIdx = prepareBucket(groupId);
+ long timeBucket = timeBucketAssigner.getTimeBucketFor(windowId);
+ if (timeBucket != -1) {
+ buckets[bucketIdx].put(key, timeBucket, value);
+ }
+ }
+
+ @Override
+ public Slice getSync(long groupId, Slice key)
+ {
+ int bucketIdx = prepareBucket(groupId);
+ return buckets[bucketIdx].get(key, -1, Bucket.ReadSource.ALL);
+ }
+
+ @SuppressWarnings("SynchronizationOnLocalVariableOrMethodParameter")
+ @Override
+ public Future<Slice> getAsync(long groupId, Slice key)
+ {
+ int bucketIdx = prepareBucket(groupId);
+ Bucket bucket = buckets[bucketIdx];
+ synchronized (bucket) {
+ Slice cachedVal = buckets[bucketIdx].get(key, -1,
Bucket.ReadSource.MEMORY);
+ if (cachedVal != null) {
+ return Futures.immediateFuture(cachedVal);
+ }
+ return readerService.submit(new KeyFetchTask(bucket, key, -1,
throwable));
+ }
+ }
+
+ /**
+ * Prepares the bucket and returns its index.
+ * @param groupId bucket key
+ * @return bucket index
+ */
+ protected int prepareBucket(long groupId)
+ {
+ stateTracker.bucketAccessed(groupId);
+ int bucketIdx = getBucketIdx(groupId);
+
+ Bucket bucket = buckets[bucketIdx];
+ if (bucket == null) {
+ //bucket is not in memory
+ bucket = newBucket(groupId);
+ buckets[bucketIdx] = bucket;
+ }
+ return bucketIdx;
+ }
+
+ protected int getBucketIdx(long bucketKey)
+ {
+ return (int)(bucketKey % numBuckets);
+ }
+
+ Bucket getBucket(long groupId)
+ {
+ return buckets[getBucketIdx(groupId)];
+ }
+
+ protected Bucket newBucket(long groupId)
+ {
+ return new Bucket.DefaultBucket(groupId, this);
+ }
+
+ @Override
+ public void endWindow()
+ {
+ timeBucketAssigner.endWindow();
+ if (!replay && windowCount == incrementalCheckpointWindowCount) {
+ checkpointDifference();
+ windowCount = 0;
+ }
+ }
+
+ protected void checkpointDifference()
+ {
+ Map<Long, Map<Slice, Bucket.BucketedValue>> flashData =
Maps.newHashMap();
+
+ for (Bucket bucket : buckets) {
+ if (bucket != null) {
+ Map<Slice, Bucket.BucketedValue> flashDataForBucket =
bucket.checkpoint(windowId);
+ if (!flashDataForBucket.isEmpty()) {
+ flashData.put(bucket.getBucketKey(), flashDataForBucket);
+ }
+ }
+ }
+ if (!flashData.isEmpty()) {
+ try {
+ dataManager.save(flashData, operatorId, windowId);
+ } catch (IOException e) {
+ throw new RuntimeException(e);
+ }
+ }
+ }
+
+ @Override
+ public void checkpointed(long l)
+ {
+ }
+
+ @Override
+ public void committed(long l)
+ {
+ synchronized (commitLock) {
+ try {
+ for (Bucket bucket : buckets) {
+ if (bucket != null) {
+ bucket.committed(l);
+ }
+ }
+ dataManager.committed(operatorId, l);
+ } catch (IOException e) {
+ throw new RuntimeException("committing " + l, e);
+ }
+ }
+ }
+
+ @Override
+ public void teardown()
+ {
+ dataManager.teardown();
+ timeBucketAssigner.teardown();
+ for (Bucket bucket : buckets) {
+ if (bucket != null) {
+ bucket.teardown();
+ }
+ }
+ stateTracker.teardown();
+ }
+
+ @Override
+ public void setCacheSize(long bytes)
+ {
+ maxCacheSize = bytes;
+ }
+
+ public long getCacheSize()
+ {
+ return maxCacheSize;
+ }
+
+ public void setFileAccess(@NotNull FileAccess fileAccess)
+ {
+ this.fileAccess = Preconditions.checkNotNull(fileAccess);
+ }
+
+ public void setKeyComparator(@NotNull Comparator<Slice> keyComparator)
+ {
+ this.keyComparator = Preconditions.checkNotNull(keyComparator);
+ }
+
+ @Override
+ public FileAccess getFileAccess()
+ {
+ return fileAccess;
+ }
+
+ public void setTimeBucketAssigner(@NotNull TimeBucketAssigner
timeBucketAssigner)
+ {
+ this.timeBucketAssigner =
Preconditions.checkNotNull(timeBucketAssigner);
+ }
+
+ public TimeBucketAssigner getTimeBucketAssigner()
+ {
+ return timeBucketAssigner;
+ }
+
+ @Override
+ public Comparator<Slice> getKeyComparator()
+ {
+ return keyComparator;
+ }
+
+ @Override
+ public BucketsMetaDataManager getBucketsMetaDataManager()
+ {
+ return bucketsMetaDataManager;
+ }
+
+ public int getNumReaders()
--- End diff --
Purpose of numReaders?
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at [email protected] or file a JIRA ticket
with INFRA.
---
