alluxio.client.block.BlockMasterClientPool Maven / Gradle / Ivy
/*
* The Alluxio Open Foundation licenses this work under the Apache License, version 2.0
* (the "License"). You may not use this work except in alluxio.shaded.client.com.liance with the License, which is
* available at www.apache.alluxio.shaded.client.org.licenses/LICENSE-2.0
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
* either express or implied, as more fully set forth in the License.
*
* See the NOTICE file distributed with this work for information regarding copyright ownership.
*/
package alluxio.client.block;
import alluxio.conf.PropertyKey;
import alluxio.master.MasterClientContext;
import alluxio.metrics.MetricKey;
import alluxio.metrics.MetricsSystem;
import alluxio.resource.DynamicResourcePool;
import alluxio.resource.ResourcePool;
import alluxio.util.ThreadFactoryUtils;
import alluxio.shaded.client.com.codahale.metrics.Counter;
import java.alluxio.shaded.client.io.IOException;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.ScheduledThreadPoolExecutor;
import alluxio.shaded.client.javax.annotation.concurrent.ThreadSafe;
/**
* Class for managing block master clients. After obtaining a client with
* {@link ResourcePool#acquire()}, {@link ResourcePool#release(Object)} must be called when the
* thread is done using the client.
*/
@ThreadSafe
public final class BlockMasterClientPool extends DynamicResourcePool {
private final MasterClientContext mMasterContext;
private final long mGcThresholdMs;
private static final int BLOCK_MASTER_CLIENT_POOL_GC_THREADPOOL_SIZE = 1;
private static final ScheduledExecutorService GC_EXECUTOR =
new ScheduledThreadPoolExecutor(BLOCK_MASTER_CLIENT_POOL_GC_THREADPOOL_SIZE,
ThreadFactoryUtils.build("BlockMasterClientPoolGcThreads-%d", true));
private static final Counter COUNTER = MetricsSystem.counter(
MetricKey.CLIENT_BLOCK_MASTER_CLIENT_COUNT.getName());
/**
* Creates a new block master client pool.
*
* @param ctx the information required for connecting to Alluxio
*/
public BlockMasterClientPool(MasterClientContext ctx) {
super(Options.defaultOptions()
.setMinCapacity(ctx.getClusterConf()
.getInt(PropertyKey.USER_BLOCK_MASTER_CLIENT_POOL_SIZE_MIN))
.setMaxCapacity(ctx.getClusterConf()
.getInt(PropertyKey.USER_BLOCK_MASTER_CLIENT_POOL_SIZE_MAX))
.setGcIntervalMs(
ctx.getClusterConf().getMs(PropertyKey.USER_BLOCK_MASTER_CLIENT_POOL_GC_INTERVAL_MS))
.setGcExecutor(GC_EXECUTOR));
mMasterContext = ctx;
mGcThresholdMs =
ctx.getClusterConf().getMs(PropertyKey.USER_BLOCK_MASTER_CLIENT_POOL_GC_THRESHOLD_MS);
}
@Override
protected void closeResource(BlockMasterClient client) {
try {
client.close();
} catch (IOException e) {
throw new RuntimeException(e);
}
}
@Override
protected BlockMasterClient createNewResource() {
return BlockMasterClient.Factory.create(mMasterContext);
}
@Override
protected boolean isHealthy(BlockMasterClient client) {
return client.isConnected();
}
@Override
protected Counter getMetricCounter() {
return COUNTER;
}
@Override
protected boolean shouldGc(ResourceInternal clientResourceInternal) {
return System.currentTimeMillis()
- clientResourceInternal.getLastAccessTimeMs() > mGcThresholdMs;
}
}