This is an automated email from the ASF dual-hosted git repository.
karanmehta93 pushed a commit to branch 4.x-HBase-1.4
in repository https://gitbox.apache.org/repos/asf/phoenix.git
The following commit(s) were added to refs/heads/4.x-HBase-1.4 by this push:
new ffbfc80 PHOENIX-5069 Use asynchronous refresh to provide non-blocking
Phoenix Stats Client Cache
ffbfc80 is described below
commit ffbfc8012027fa399bdba9ee4ab1074fc30229cb
Author: Bin <b...@salesforce.com>
AuthorDate: Tue Feb 5 15:37:21 2019 -0800
PHOENIX-5069 Use asynchronous refresh to provide non-blocking Phoenix Stats
Client Cache
---
.../org/apache/phoenix/query/GuidePostsCache.java | 86 ++++++++----
.../phoenix/query/PhoenixStatsCacheLoader.java | 90 ++++++++++++
.../apache/phoenix/query/PhoenixStatsLoader.java | 57 ++++++++
.../org/apache/phoenix/query/QueryServices.java | 4 +-
.../apache/phoenix/query/QueryServicesOptions.java | 7 +
.../phoenix/schema/stats/GuidePostsInfo.java | 6 +-
.../phoenix/query/PhoenixStatsCacheLoaderTest.java | 156 +++++++++++++++++++++
7 files changed, 378 insertions(+), 28 deletions(-)
diff --git
a/phoenix-core/src/main/java/org/apache/phoenix/query/GuidePostsCache.java
b/phoenix-core/src/main/java/org/apache/phoenix/query/GuidePostsCache.java
index 066dd5f..2c2697a 100644
--- a/phoenix-core/src/main/java/org/apache/phoenix/query/GuidePostsCache.java
+++ b/phoenix-core/src/main/java/org/apache/phoenix/query/GuidePostsCache.java
@@ -22,12 +22,12 @@ import static
org.apache.phoenix.query.QueryServicesOptions.DEFAULT_STATS_COLLEC
import java.io.IOException;
import java.util.List;
import java.util.Objects;
-import java.util.concurrent.ExecutionException;
-import java.util.concurrent.TimeUnit;
+import java.util.concurrent.*;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.HConstants;
import org.apache.hadoop.hbase.HTableDescriptor;
+import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.TableNotFoundException;
import org.apache.hadoop.hbase.client.Table;
import org.apache.hadoop.hbase.util.Bytes;
@@ -42,13 +42,13 @@ import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.google.common.cache.CacheBuilder;
-import com.google.common.cache.CacheLoader;
import com.google.common.cache.LoadingCache;
import com.google.common.cache.RemovalCause;
import com.google.common.cache.RemovalListener;
import com.google.common.cache.RemovalNotification;
import com.google.common.cache.Weigher;
+
/**
* "Client-side" cache for storing {@link GuidePostsInfo} for a column family.
Intended to decouple
* Phoenix from a specific version of Guava's cache.
@@ -58,21 +58,29 @@ public class GuidePostsCache {
private final ConnectionQueryServices queryServices;
private final LoadingCache<GuidePostsKey, GuidePostsInfo> cache;
+ private ExecutorService executor = null;
public GuidePostsCache(ConnectionQueryServices queryServices,
Configuration config) {
this.queryServices = Objects.requireNonNull(queryServices);
+
// Number of millis to expire cache values after write
final long statsUpdateFrequency = config.getLong(
QueryServices.STATS_UPDATE_FREQ_MS_ATTRIB,
QueryServicesOptions.DEFAULT_STATS_UPDATE_FREQ_MS);
- // Maximum number of entries (tables) to store in the cache at one time
+
+ // Maximum total weight (size in bytes) of stats entries
final long maxTableStatsCacheSize = config.getLong(
QueryServices.STATS_MAX_CACHE_SIZE,
QueryServicesOptions.DEFAULT_STATS_MAX_CACHE_SIZE);
+
final boolean isStatsEnabled =
config.getBoolean(STATS_COLLECTION_ENABLED, DEFAULT_STATS_COLLECTION_ENABLED);
+
+ PhoenixStatsCacheLoader cacheLoader = new PhoenixStatsCacheLoader(
+ isStatsEnabled ? new StatsLoaderImpl() : new
EmptyStatsLoader(), config);
+
cache = CacheBuilder.newBuilder()
- // Expire entries a given amount of time after they were
written
- .expireAfterWrite(statsUpdateFrequency, TimeUnit.MILLISECONDS)
+ // Refresh entries a given amount of time after they were
written
+ .refreshAfterWrite(statsUpdateFrequency, TimeUnit.MILLISECONDS)
// Maximum total weight (size in bytes) of stats entries
.maximumWeight(maxTableStatsCacheSize)
// Defer actual size to the PTableStats.getEstimatedSize()
@@ -84,18 +92,37 @@ public class GuidePostsCache {
// Log removals at TRACE for debugging
.removalListener(new PhoenixStatsCacheRemovalListener())
// Automatically load the cache when entries are missing
- .build(isStatsEnabled ? new StatsLoader() : new
EmptyStatsLoader());
+ .build(cacheLoader);
}
/**
- * {@link CacheLoader} implementation for the Phoenix Table Stats cache.
+ * {@link PhoenixStatsLoader} implementation for the Stats Loader.
*/
- protected class StatsLoader extends CacheLoader<GuidePostsKey,
GuidePostsInfo> {
+ protected class StatsLoaderImpl implements PhoenixStatsLoader {
+ @Override
+ public boolean needsLoad() {
+ // For now, whenever it's called, we try to load stats from stats
table
+ // no matter it has been updated or not.
+ // Here are the possible optimizations we can do here:
+ // 1. Load stats from the stats table only when the stats get
updated on the server side.
+ // 2. Support different refresh cycle for different tables.
+ return true;
+ }
+
+ @Override
+ public GuidePostsInfo loadStats(GuidePostsKey statsKey) throws
Exception {
+ return loadStats(statsKey, GuidePostsInfo.NO_GUIDEPOST);
+ }
+
@Override
- public GuidePostsInfo load(GuidePostsKey statsKey) throws Exception {
- Table statsHTable =
queryServices.getTable(SchemaUtil.getPhysicalName(
+ public GuidePostsInfo loadStats(GuidePostsKey statsKey, GuidePostsInfo
prevGuidepostInfo) throws Exception {
+ assert(prevGuidepostInfo != null);
+
+ TableName tableName = SchemaUtil.getPhysicalName(
PhoenixDatabaseMetaData.SYSTEM_STATS_NAME_BYTES,
- queryServices.getProps()).getName());
+ queryServices.getProps());
+ Table statsHTable = queryServices.getTable(tableName.getName());
+
try {
GuidePostsInfo guidePostsInfo =
StatisticsUtil.readStatistics(statsHTable, statsKey,
HConstants.LATEST_TIMESTAMP);
@@ -103,18 +130,17 @@ public class GuidePostsCache {
return guidePostsInfo;
} catch (TableNotFoundException e) {
// On a fresh install, stats might not yet be created, don't
warn about this.
- logger.debug("Unable to locate Phoenix stats table", e);
- return GuidePostsInfo.NO_GUIDEPOST;
+ logger.debug("Unable to locate Phoenix stats table: " +
tableName.toString(), e);
+ return prevGuidepostInfo;
} catch (IOException e) {
- logger.warn("Unable to read from stats table", e);
- // Just cache empty stats. We'll try again after some time
anyway.
- return GuidePostsInfo.NO_GUIDEPOST;
+ logger.warn("Unable to read from stats table: " +
tableName.toString(), e);
+ return prevGuidepostInfo;
} finally {
try {
statsHTable.close();
} catch (IOException e) {
// Log, but continue. We have our stats anyway now.
- logger.warn("Unable to close stats table", e);
+ logger.warn("Unable to close stats table: " +
tableName.toString(), e);
}
}
}
@@ -125,20 +151,30 @@ public class GuidePostsCache {
void traceStatsUpdate(GuidePostsKey key, GuidePostsInfo info) {
if (logger.isTraceEnabled()) {
logger.trace("Updating local TableStats cache (id={}) for {},
size={}bytes",
- new Object[] {Objects.hashCode(GuidePostsCache.this),
key,
- info.getEstimatedSize()});
+ new Object[] {Objects.hashCode(GuidePostsCache.this),
key, info.getEstimatedSize()});
}
}
}
/**
+ * {@link PhoenixStatsLoader} implementation for the Stats Loader.
* Empty stats loader if stats are disabled
*/
- protected class EmptyStatsLoader extends CacheLoader<GuidePostsKey,
GuidePostsInfo> {
- @Override
- public GuidePostsInfo load(GuidePostsKey statsKey) throws
Exception {
- return GuidePostsInfo.NO_GUIDEPOST;
- }
+ protected class EmptyStatsLoader implements PhoenixStatsLoader {
+ @Override
+ public boolean needsLoad() {
+ return false;
+ }
+
+ @Override
+ public GuidePostsInfo loadStats(GuidePostsKey statsKey) throws
Exception {
+ return GuidePostsInfo.NO_GUIDEPOST;
+ }
+
+ @Override
+ public GuidePostsInfo loadStats(GuidePostsKey statsKey, GuidePostsInfo
prevGuidepostInfo) throws Exception {
+ return GuidePostsInfo.NO_GUIDEPOST;
+ }
}
/**
diff --git
a/phoenix-core/src/main/java/org/apache/phoenix/query/PhoenixStatsCacheLoader.java
b/phoenix-core/src/main/java/org/apache/phoenix/query/PhoenixStatsCacheLoader.java
new file mode 100644
index 0000000..98e9587
--- /dev/null
+++
b/phoenix-core/src/main/java/org/apache/phoenix/query/PhoenixStatsCacheLoader.java
@@ -0,0 +1,90 @@
+/*
+ * 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.phoenix.query;
+
+import com.google.common.cache.CacheLoader;
+import com.google.common.util.concurrent.Futures;
+import com.google.common.util.concurrent.ListenableFuture;
+import com.google.common.util.concurrent.ListenableFutureTask;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.phoenix.schema.stats.GuidePostsInfo;
+import org.apache.phoenix.schema.stats.GuidePostsKey;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.concurrent.Callable;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+
+/**
+ * {@link CacheLoader} implementation for the Phoenix Table Stats cache.
+ */
+public class PhoenixStatsCacheLoader extends CacheLoader<GuidePostsKey,
GuidePostsInfo> {
+ private static final Logger logger =
LoggerFactory.getLogger(PhoenixStatsCacheLoader.class);
+
+ final private PhoenixStatsLoader statsLoader;
+ private static volatile ExecutorService executor;
+
+ public PhoenixStatsCacheLoader(PhoenixStatsLoader statsLoader,
Configuration config) {
+ this.statsLoader = statsLoader;
+
+ if (this.executor == null) {
+ synchronized (PhoenixStatsCacheLoader.class) {
+ if (this.executor == null) {
+ // The size of the thread pool used for refreshing cached
table stats
+ final int statsCacheThreadPoolSize = config.getInt(
+ QueryServices.STATS_CACHE_THREAD_POOL_SIZE,
+
QueryServicesOptions.DEFAULT_STATS_CACHE_THREAD_POOL_SIZE);
+
+ this.executor =
Executors.newFixedThreadPool(statsCacheThreadPoolSize);
+ }
+ }
+ }
+ }
+
+ @Override
+ public GuidePostsInfo load(GuidePostsKey statsKey) throws Exception {
+ return statsLoader.loadStats(statsKey);
+ }
+
+ @Override
+ public ListenableFuture<GuidePostsInfo> reload(
+ final GuidePostsKey key,
+ final GuidePostsInfo prevGuidepostInfo)
+ {
+ if (statsLoader.needsLoad()) {
+ // schedule asynchronous task
+ ListenableFutureTask<GuidePostsInfo> task =
+ ListenableFutureTask.create(new Callable<GuidePostsInfo>()
{
+ public GuidePostsInfo call() {
+ try {
+ return statsLoader.loadStats(key,
prevGuidepostInfo);
+ } catch (Exception e) {
+ logger.warn("Unable to load stats from table:
" + key.toString(), e);
+ return prevGuidepostInfo;
+ }
+ }
+ });
+ executor.execute(task);
+ return task;
+ }
+ else {
+ return Futures.immediateFuture(prevGuidepostInfo);
+ }
+ }
+}
\ No newline at end of file
diff --git
a/phoenix-core/src/main/java/org/apache/phoenix/query/PhoenixStatsLoader.java
b/phoenix-core/src/main/java/org/apache/phoenix/query/PhoenixStatsLoader.java
new file mode 100644
index 0000000..eda5e56
--- /dev/null
+++
b/phoenix-core/src/main/java/org/apache/phoenix/query/PhoenixStatsLoader.java
@@ -0,0 +1,57 @@
+/*
+ * 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.phoenix.query;
+
+import org.apache.phoenix.schema.stats.GuidePostsInfo;
+import org.apache.phoenix.schema.stats.GuidePostsKey;
+
+/**
+ * The interface for talking to underneath layers to load stats from stats
table for a given key
+ */
+public interface PhoenixStatsLoader {
+ /**
+ * Use to check whether this is the time to load stats from stats table.
+ * There are two cases:
+ * a. After a specified duration has passed
+ * b. The stats on server side (e.g. in stats table) has been updated
+ *
+ * @return boolean indicates whether we need to load stats or not
+ */
+ boolean needsLoad();
+
+ /**
+ * Called by client stats cache to load stats from underneath layers
+ *
+ * @param statsKey the stats key used to search the stats on server side
(in stats table)
+ * @throws Exception
+ *
+ * @return GuidePostsInfo retrieved from sever side
+ */
+ GuidePostsInfo loadStats(GuidePostsKey statsKey) throws Exception;
+
+ /**
+ * Called by client stats cache to load stats from underneath layers
+ *
+ * @param statsKey the stats key used to search the stats on server side
(in stats table)
+ * @param prevGuidepostInfo the existing stats cached on the client side
or GuidePostsInfo.NO_GUIDEPOST
+ * @throws Exception
+ *
+ * @return GuidePostsInfo retrieved from sever side
+ */
+ GuidePostsInfo loadStats(GuidePostsKey statsKey, GuidePostsInfo
prevGuidepostInfo) throws Exception;
+}
diff --git
a/phoenix-core/src/main/java/org/apache/phoenix/query/QueryServices.java
b/phoenix-core/src/main/java/org/apache/phoenix/query/QueryServices.java
index e279f05..fc11539 100644
--- a/phoenix-core/src/main/java/org/apache/phoenix/query/QueryServices.java
+++ b/phoenix-core/src/main/java/org/apache/phoenix/query/QueryServices.java
@@ -197,8 +197,10 @@ public interface QueryServices extends SQLCloseable {
public static final String COMMIT_STATS_ASYNC =
"phoenix.stats.commit.async";
// Maximum size in bytes taken up by cached table stats in the client
public static final String STATS_MAX_CACHE_SIZE =
"phoenix.stats.cache.maxSize";
- public static final String LOG_SALT_BUCKETS_ATTRIB =
"phoenix.log.saltBuckets";
+ // The size of the thread pool used for refreshing cached table stats in
stats client cache
+ public static final String STATS_CACHE_THREAD_POOL_SIZE =
"phoenix.stats.cache.threadPoolSize";
+ public static final String LOG_SALT_BUCKETS_ATTRIB =
"phoenix.log.saltBuckets";
public static final String SEQUENCE_SALT_BUCKETS_ATTRIB =
"phoenix.sequence.saltBuckets";
public static final String COPROCESSOR_PRIORITY_ATTRIB =
"phoenix.coprocessor.priority";
public static final String EXPLAIN_CHUNK_COUNT_ATTRIB =
"phoenix.explain.displayChunkCount";
diff --git
a/phoenix-core/src/main/java/org/apache/phoenix/query/QueryServicesOptions.java
b/phoenix-core/src/main/java/org/apache/phoenix/query/QueryServicesOptions.java
index 4407530..fcf57c7 100644
---
a/phoenix-core/src/main/java/org/apache/phoenix/query/QueryServicesOptions.java
+++
b/phoenix-core/src/main/java/org/apache/phoenix/query/QueryServicesOptions.java
@@ -86,6 +86,7 @@ import static
org.apache.phoenix.query.QueryServices.SPOOL_THRESHOLD_BYTES_ATTRI
import static org.apache.phoenix.query.QueryServices.STATS_COLLECTION_ENABLED;
import static
org.apache.phoenix.query.QueryServices.STATS_GUIDEPOST_WIDTH_BYTES_ATTRIB;
import static
org.apache.phoenix.query.QueryServices.STATS_UPDATE_FREQ_MS_ATTRIB;
+import static
org.apache.phoenix.query.QueryServices.STATS_CACHE_THREAD_POOL_SIZE;
import static
org.apache.phoenix.query.QueryServices.STATS_USE_CURRENT_TIME_ATTRIB;
import static org.apache.phoenix.query.QueryServices.THREAD_POOL_SIZE_ATTRIB;
import static org.apache.phoenix.query.QueryServices.THREAD_TIMEOUT_MS_ATTRIB;
@@ -247,6 +248,7 @@ public class QueryServicesOptions {
public static final long DEFAULT_STATS_MAX_CACHE_SIZE = 256 * 1024 * 1024;
// Allow stats collection to be initiated by client multiple times
immediately
public static final int DEFAULT_MIN_STATS_UPDATE_FREQ_MS = 0;
+ public static final int DEFAULT_STATS_CACHE_THREAD_POOL_SIZE = 4;
public static final boolean DEFAULT_USE_REVERSE_SCAN = true;
@@ -414,6 +416,7 @@ public class QueryServicesOptions {
.setIfUnset(DATE_FORMAT_TIMEZONE_ATTRIB,
DEFAULT_DATE_FORMAT_TIMEZONE)
.setIfUnset(STATS_UPDATE_FREQ_MS_ATTRIB,
DEFAULT_STATS_UPDATE_FREQ_MS)
.setIfUnset(MIN_STATS_UPDATE_FREQ_MS_ATTRIB,
DEFAULT_MIN_STATS_UPDATE_FREQ_MS)
+ .setIfUnset(STATS_CACHE_THREAD_POOL_SIZE,
DEFAULT_STATS_CACHE_THREAD_POOL_SIZE)
.setIfUnset(CALL_QUEUE_ROUND_ROBIN_ATTRIB,
DEFAULT_CALL_QUEUE_ROUND_ROBIN)
.setIfUnset(MAX_MUTATION_SIZE_ATTRIB, DEFAULT_MAX_MUTATION_SIZE)
.setIfUnset(ROW_KEY_ORDER_SALTED_TABLE_ATTRIB,
DEFAULT_FORCE_ROW_KEY_ORDER)
@@ -736,6 +739,10 @@ public class QueryServicesOptions {
return set(MIN_STATS_UPDATE_FREQ_MS_ATTRIB, frequencyMs);
}
+ public QueryServicesOptions setStatsCacheThreadPoolSize(int
threadPoolSize) {
+ return set(STATS_CACHE_THREAD_POOL_SIZE, threadPoolSize);
+ }
+
public QueryServicesOptions setSequenceSaltBuckets(int saltBuckets) {
config.setInt(SEQUENCE_SALT_BUCKETS_ATTRIB, saltBuckets);
return this;
diff --git
a/phoenix-core/src/main/java/org/apache/phoenix/schema/stats/GuidePostsInfo.java
b/phoenix-core/src/main/java/org/apache/phoenix/schema/stats/GuidePostsInfo.java
index 04c69bf..9492a35 100644
---
a/phoenix-core/src/main/java/org/apache/phoenix/schema/stats/GuidePostsInfo.java
+++
b/phoenix-core/src/main/java/org/apache/phoenix/schema/stats/GuidePostsInfo.java
@@ -95,15 +95,17 @@ public class GuidePostsInfo {
this.guidePostsCount = guidePostsCount;
this.rowCounts = Longs.toArray(rowCounts);
this.byteCounts = Longs.toArray(byteCounts);
- int estimatedSize = SizedUtil.OBJECT_SIZE
+ this.gpTimestamps = Longs.toArray(updateTimes);
+ // Those Java equivalents of sizeof() in C/C++, mentioned on the Web,
might be overkilled here.
+ int estimatedSize = SizedUtil.OBJECT_SIZE
+ SizedUtil.IMMUTABLE_BYTES_WRITABLE_SIZE +
guidePosts.getLength() // guidePosts
+ SizedUtil.INT_SIZE // maxLength
+ SizedUtil.INT_SIZE // guidePostsCount
+ SizedUtil.ARRAY_SIZE + this.rowCounts.length *
SizedUtil.LONG_SIZE // rowCounts
+ SizedUtil.ARRAY_SIZE + this.byteCounts.length *
SizedUtil.LONG_SIZE // byteCounts
+ + SizedUtil.ARRAY_SIZE + this.gpTimestamps.length *
SizedUtil.LONG_SIZE // gpTimestamps
+ SizedUtil.INT_SIZE; // estimatedSize
this.estimatedSize = estimatedSize;
- this.gpTimestamps = Longs.toArray(updateTimes);
}
public ImmutableBytesWritable getGuidePosts() {
diff --git
a/phoenix-core/src/test/java/org/apache/phoenix/query/PhoenixStatsCacheLoaderTest.java
b/phoenix-core/src/test/java/org/apache/phoenix/query/PhoenixStatsCacheLoaderTest.java
new file mode 100644
index 0000000..e9c6d40
--- /dev/null
+++
b/phoenix-core/src/test/java/org/apache/phoenix/query/PhoenixStatsCacheLoaderTest.java
@@ -0,0 +1,156 @@
+/*
+ * 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.phoenix.query;
+
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+
+import com.google.common.cache.CacheBuilder;
+import com.google.common.cache.LoadingCache;
+import com.google.common.cache.Weigher;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.hbase.io.ImmutableBytesWritable;
+import org.apache.phoenix.schema.stats.GuidePostsInfo;
+import org.apache.phoenix.schema.stats.GuidePostsKey;
+import org.apache.phoenix.util.ByteUtil;
+import org.junit.Test;
+
+import java.lang.Thread;
+import java.util.Collections;
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.Executors;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.ExecutorService;
+
+/**
+ * Test class around the PhoenixStatsCacheLoader.
+ */
+public class PhoenixStatsCacheLoaderTest {
+ /**
+ * {@link PhoenixStatsLoader} test implementation for the Stats Loader.
+ */
+ protected class TestStatsLoaderImpl implements PhoenixStatsLoader {
+ private int maxLength = 1;
+ private final CountDownLatch firstTimeRefreshedSignal;
+ private final CountDownLatch secondTimeRefreshedSignal;
+
+ public TestStatsLoaderImpl(CountDownLatch firstTimeRefreshedSignal,
CountDownLatch secondTimeRefreshedSignal) {
+ this.firstTimeRefreshedSignal = firstTimeRefreshedSignal;
+ this.secondTimeRefreshedSignal = secondTimeRefreshedSignal;
+ }
+
+ @Override
+ public boolean needsLoad() {
+ // Whenever it's called, we try to load stats from stats table
+ // no matter it has been updated or not.
+ return true;
+ }
+
+ @Override
+ public GuidePostsInfo loadStats(GuidePostsKey statsKey) throws
Exception {
+ return new GuidePostsInfo(Collections.<Long> emptyList(),
+ new ImmutableBytesWritable(ByteUtil.EMPTY_BYTE_ARRAY),
+ Collections.<Long> emptyList(), maxLength++, 0,
Collections.<Long> emptyList());
+ }
+
+ @Override
+ public GuidePostsInfo loadStats(GuidePostsKey statsKey, GuidePostsInfo
prevGuidepostInfo) throws Exception {
+ firstTimeRefreshedSignal.countDown();
+ secondTimeRefreshedSignal.countDown();
+
+ return new GuidePostsInfo(Collections.<Long> emptyList(),
+ new ImmutableBytesWritable(ByteUtil.EMPTY_BYTE_ARRAY),
+ Collections.<Long> emptyList(), maxLength++, 0,
Collections.<Long> emptyList());
+ }
+ }
+
+ GuidePostsInfo getStats(LoadingCache<GuidePostsKey, GuidePostsInfo> cache,
GuidePostsKey guidePostsKey) {
+ GuidePostsInfo guidePostsInfo;
+ try {
+ guidePostsInfo = cache.get(guidePostsKey);
+ } catch (ExecutionException e) {
+ assertFalse(true);
+ return GuidePostsInfo.NO_GUIDEPOST;
+ }
+
+ return guidePostsInfo;
+ }
+
+ void sleep(int x) {
+ try {
+ Thread.sleep(x);
+ }
+ catch (InterruptedException e) {
+ assertFalse(true);
+ }
+ }
+
+ @Test
+ public void testStatsBeingAutomaticallyRefreshed() {
+ ExecutorService executor = Executors.newFixedThreadPool(4);
+
+ CountDownLatch firstTimeRefreshedSignal = new CountDownLatch(1);
+ CountDownLatch secondTimeRefreshedSignal = new CountDownLatch(2);
+
+ Configuration config =
HBaseFactoryProvider.getConfigurationFactory().getConfiguration();
+
+ LoadingCache<GuidePostsKey, GuidePostsInfo> cache =
CacheBuilder.newBuilder()
+ // Refresh entries a given amount of time after they were
written
+ .refreshAfterWrite(100, TimeUnit.MILLISECONDS)
+ // Maximum total weight (size in bytes) of stats entries
+
.maximumWeight(QueryServicesOptions.DEFAULT_STATS_MAX_CACHE_SIZE)
+ // Defer actual size to the PTableStats.getEstimatedSize()
+ .weigher(new Weigher<GuidePostsKey, GuidePostsInfo>() {
+ @Override public int weigh(GuidePostsKey key,
GuidePostsInfo info) {
+ return info.getEstimatedSize();
+ }
+ })
+ // Log removals at TRACE for debugging
+ .removalListener(new
GuidePostsCache.PhoenixStatsCacheRemovalListener())
+ // Automatically load the cache when entries are missing
+ .build(new PhoenixStatsCacheLoader(new TestStatsLoaderImpl(
+ firstTimeRefreshedSignal, secondTimeRefreshedSignal),
config));
+
+ try {
+ GuidePostsKey guidePostsKey = new GuidePostsKey(new byte[4], new
byte[4]);
+ GuidePostsInfo guidePostsInfo = getStats(cache, guidePostsKey);
+ assertTrue(guidePostsInfo.getMaxLength() == 1);
+
+ // Note: With Guava cache, automatic refreshes are performed when
the first stale request for an entry occurs.
+
+ // After we sleep here for any time which is larger than the
refresh cycle, the refresh of cache entry will be
+ // triggered for its first time by the call of getStats(). This is
deterministic behavior, and it won't cause
+ // randomized test failures.
+ sleep(150);
+ guidePostsInfo = getStats(cache, guidePostsKey);
+ // Refresh has been triggered for its first time, but still could
get the old value
+ assertTrue(guidePostsInfo.getMaxLength() >= 1);
+ firstTimeRefreshedSignal.await();
+
+ sleep(150);
+ guidePostsInfo = getStats(cache, guidePostsKey);
+ // Now the second time refresh has been triggered by the above
getStats() call, the first time Refresh has completed
+ // and the cache entry has been updated for sure.
+ assertTrue(guidePostsInfo.getMaxLength() >= 2);
+ secondTimeRefreshedSignal.await();
+ }
+ catch (InterruptedException e) {
+ assertFalse(true);
+ }
+ }
+}
\ No newline at end of file
