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HDFS-14458. Report pmem stats to namenode. Contributed by Feilong He.

This commit is contained in:
Rakesh Radhakrishnan 2019-07-15 13:02:37 +05:30
parent 0976f6fc30
commit e98adb00b7
9 changed files with 45 additions and 60 deletions
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6
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/MemoryCacheStats.java → hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/CacheStats.java
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@ -27,7 +27,7 @@ import com.google.common.annotations.VisibleForTesting;
/**
* Keeps statistics for the memory cache.
*/
class MemoryCacheStats {
class CacheStats {
/**
* The approximate amount of cache space in use.
@ -47,7 +47,7 @@ class MemoryCacheStats {
*/
private final long maxBytes;
MemoryCacheStats(long maxBytes) {
CacheStats(long maxBytes) {
this.usedBytesCount = new UsedBytesCount();
this.maxBytes = maxBytes;
}
@ -81,7 +81,7 @@ class MemoryCacheStats {
private class UsedBytesCount {
private final AtomicLong usedBytes = new AtomicLong(0);
private MemoryCacheStats.PageRounder rounder = new PageRounder();
private CacheStats.PageRounder rounder = new PageRounder();
/**
* Try to reserve more bytes.

54
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsDatasetCache.java
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@ -23,7 +23,6 @@ import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_DATANODE_CACHE_REVOCATION
import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_DATANODE_CACHE_REVOCATION_POLLING_MS;
import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_DATANODE_CACHE_REVOCATION_POLLING_MS_DEFAULT;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Preconditions;
import com.google.common.util.concurrent.ThreadFactoryBuilder;
@ -137,7 +136,7 @@ public class FsDatasetCache {
*/
private final MappableBlockLoader cacheLoader;
private final MemoryCacheStats memCacheStats;
private final CacheStats memCacheStats;
/**
* Number of cache commands that could not be completed successfully
@ -178,30 +177,17 @@ public class FsDatasetCache {
". Reconfigure this to " + minRevocationPollingMs);
}
this.revocationPollingMs = confRevocationPollingMs;
// Both lazy writer and read cache are sharing this statistics.
this.memCacheStats = new MemoryCacheStats(
dataset.datanode.getDnConf().getMaxLockedMemory());
this.cacheLoader = MappableBlockLoaderFactory.createCacheLoader(
this.getDnConf());
cacheLoader.initialize(this);
}
/**
* Check if pmem cache is enabled.
*/
private boolean isPmemCacheEnabled() {
return !cacheLoader.isTransientCache();
// Both lazy writer and read cache are sharing this statistics.
this.memCacheStats = cacheLoader.initialize(this.getDnConf());
}
DNConf getDnConf() {
return this.dataset.datanode.getDnConf();
}
MemoryCacheStats getMemCacheStats() {
return memCacheStats;
}
/**
* Get the cache path if the replica is cached into persistent memory.
*/
@ -557,37 +543,32 @@ public class FsDatasetCache {
/**
* Get the approximate amount of DRAM cache space used.
*/
public long getCacheUsed() {
public long getMemCacheUsed() {
return memCacheStats.getCacheUsed();
}
/**
* Get the approximate amount of persistent memory cache space used.
* TODO: advertise this metric to NameNode by FSDatasetMBean
* Get the approximate amount of cache space used either on DRAM or
* on persistent memory.
* @return
*/
public long getPmemCacheUsed() {
if (isPmemCacheEnabled()) {
return cacheLoader.getCacheUsed();
}
return 0;
public long getCacheUsed() {
return cacheLoader.getCacheUsed();
}
/**
* Get the maximum amount of bytes we can cache on DRAM. This is a constant.
* Get the maximum amount of bytes we can cache on DRAM. This is a constant.
*/
public long getCacheCapacity() {
public long getMemCacheCapacity() {
return memCacheStats.getCacheCapacity();
}
/**
* Get cache capacity of persistent memory.
* TODO: advertise this metric to NameNode by FSDatasetMBean
* Get the maximum amount of bytes we can cache either on DRAM or
* on persistent memory. This is a constant.
*/
public long getPmemCacheCapacity() {
if (isPmemCacheEnabled()) {
return cacheLoader.getCacheCapacity();
}
return 0;
public long getCacheCapacity() {
return cacheLoader.getCacheCapacity();
}
public long getNumBlocksFailedToCache() {
@ -608,11 +589,6 @@ public class FsDatasetCache {
return (val != null) && val.state.shouldAdvertise();
}
@VisibleForTesting
MappableBlockLoader getCacheLoader() {
return cacheLoader;
}
/**
* This method can be executed during DataNode shutdown.
*/

4
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsDatasetImpl.java
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@ -3164,10 +3164,10 @@ class FsDatasetImpl implements FsDatasetSpi<FsVolumeImpl> {
public void evictBlocks(long bytesNeeded) throws IOException {
int iterations = 0;
final long cacheCapacity = cacheManager.getCacheCapacity();
final long cacheCapacity = cacheManager.getMemCacheCapacity();
while (iterations++ < MAX_BLOCK_EVICTIONS_PER_ITERATION &&
(cacheCapacity - cacheManager.getCacheUsed()) < bytesNeeded) {
(cacheCapacity - cacheManager.getMemCacheUsed()) < bytesNeeded) {
RamDiskReplica replicaState = ramDiskReplicaTracker.getNextCandidateForEviction();
if (replicaState == null) {

3
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/MappableBlockLoader.java
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@ -24,6 +24,7 @@ import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.hdfs.ExtendedBlockId;
import org.apache.hadoop.hdfs.server.datanode.BlockMetadataHeader;
import org.apache.hadoop.hdfs.server.datanode.DNConf;
import org.apache.hadoop.util.DataChecksum;
import java.io.BufferedInputStream;
@ -43,7 +44,7 @@ public abstract class MappableBlockLoader {
/**
* Initialize a specific MappableBlockLoader.
*/
abstract void initialize(FsDatasetCache cacheManager) throws IOException;
abstract CacheStats initialize(DNConf dnConf) throws IOException;
/**
* Load the block.

8
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/MemoryMappableBlockLoader.java
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@ -22,6 +22,7 @@ import org.apache.commons.io.IOUtils;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.hdfs.ExtendedBlockId;
import org.apache.hadoop.hdfs.server.datanode.DNConf;
import org.apache.hadoop.io.nativeio.NativeIO;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
@ -39,12 +40,13 @@ import java.nio.channels.FileChannel;
public class MemoryMappableBlockLoader extends MappableBlockLoader {
private static final Logger LOG =
LoggerFactory.getLogger(MemoryMappableBlockLoader.class);
private MemoryCacheStats memCacheStats;
private CacheStats memCacheStats;
@Override
void initialize(FsDatasetCache cacheManager) throws IOException {
CacheStats initialize(DNConf dnConf) throws IOException {
LOG.info("Initializing cache loader: MemoryMappableBlockLoader.");
this.memCacheStats = cacheManager.getMemCacheStats();
this.memCacheStats = new CacheStats(dnConf.getMaxLockedMemory());
return memCacheStats;
}
/**

5
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/NativePmemMappableBlockLoader.java
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@ -24,6 +24,7 @@ import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.hdfs.ExtendedBlockId;
import org.apache.hadoop.hdfs.server.datanode.BlockMetadataHeader;
import org.apache.hadoop.hdfs.server.datanode.DNConf;
import org.apache.hadoop.io.nativeio.NativeIO;
import org.apache.hadoop.io.nativeio.NativeIO.POSIX;
import org.apache.hadoop.util.DataChecksum;
@ -47,8 +48,8 @@ public class NativePmemMappableBlockLoader extends PmemMappableBlockLoader {
LoggerFactory.getLogger(NativePmemMappableBlockLoader.class);
@Override
void initialize(FsDatasetCache cacheManager) throws IOException {
super.initialize(cacheManager);
CacheStats initialize(DNConf dnConf) throws IOException {
return super.initialize(dnConf);
}
/**

9
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/PmemMappableBlockLoader.java
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@ -42,11 +42,16 @@ public class PmemMappableBlockLoader extends MappableBlockLoader {
private PmemVolumeManager pmemVolumeManager;
@Override
void initialize(FsDatasetCache cacheManager) throws IOException {
CacheStats initialize(DNConf dnConf) throws IOException {
LOG.info("Initializing cache loader: " + this.getClass().getName());
DNConf dnConf = cacheManager.getDnConf();
PmemVolumeManager.init(dnConf.getPmemVolumes());
pmemVolumeManager = PmemVolumeManager.getInstance();
// The configuration for max locked memory is shaded.
LOG.info("Persistent memory is used for caching data instead of " +
"DRAM. Max locked memory is set to zero to disable DRAM cache");
// TODO: PMem is not supporting Lazy Writer now, will refine this stats
// while implementing it.
return new CacheStats(0L);
}
/**

14
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/TestCacheByPmemMappableBlockLoader.java
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@ -84,7 +84,6 @@ public class TestCacheByPmemMappableBlockLoader {
private static DistributedFileSystem fs;
private static DataNode dn;
private static FsDatasetCache cacheManager;
private static PmemMappableBlockLoader cacheLoader;
/**
* Used to pause DN BPServiceActor threads. BPSA threads acquire the
* shared read lock. The test acquires the write lock for exclusive access.
@ -131,8 +130,6 @@ public class TestCacheByPmemMappableBlockLoader {
DFSConfigKeys.DFS_NAMENODE_PATH_BASED_CACHE_REFRESH_INTERVAL_MS, 100);
conf.setLong(DFSConfigKeys.DFS_CACHEREPORT_INTERVAL_MSEC_KEY, 500);
conf.setLong(DFSConfigKeys.DFS_BLOCK_SIZE_KEY, BLOCK_SIZE);
conf.setLong(DFSConfigKeys.DFS_DATANODE_MAX_LOCKED_MEMORY_KEY,
CACHE_CAPACITY);
conf.setLong(DFSConfigKeys.DFS_HEARTBEAT_INTERVAL_KEY, 1);
conf.setInt(DFS_DATANODE_FSDATASETCACHE_MAX_THREADS_PER_VOLUME_KEY, 10);
@ -153,7 +150,6 @@ public class TestCacheByPmemMappableBlockLoader {
fs = cluster.getFileSystem();
dn = cluster.getDataNodes().get(0);
cacheManager = ((FsDatasetImpl) dn.getFSDataset()).cacheManager;
cacheLoader = (PmemMappableBlockLoader) cacheManager.getCacheLoader();
}
@After
@ -216,7 +212,9 @@ public class TestCacheByPmemMappableBlockLoader {
Ints.checkedCast(CACHE_CAPACITY / BLOCK_SIZE);
BlockReaderTestUtil.enableHdfsCachingTracing();
Assert.assertEquals(0, CACHE_CAPACITY % BLOCK_SIZE);
assertEquals(CACHE_CAPACITY, cacheManager.getPmemCacheCapacity());
assertEquals(CACHE_CAPACITY, cacheManager.getCacheCapacity());
// DRAM cache is expected to be disabled.
assertEquals(0L, cacheManager.getMemCacheCapacity());
final Path testFile = new Path("/testFile");
final long testFileLen = maxCacheBlocksNum * BLOCK_SIZE;
@ -246,7 +244,9 @@ public class TestCacheByPmemMappableBlockLoader {
}, 1000, 30000);
// The pmem cache space is expected to have been used up.
assertEquals(CACHE_CAPACITY, cacheManager.getPmemCacheUsed());
assertEquals(CACHE_CAPACITY, cacheManager.getCacheUsed());
// There should be no cache used on DRAM.
assertEquals(0L, cacheManager.getMemCacheUsed());
Map<ExtendedBlockId, Byte> blockKeyToVolume =
PmemVolumeManager.getInstance().getBlockKeyToVolume();
// All block keys should be kept in blockKeyToVolume
@ -318,7 +318,7 @@ public class TestCacheByPmemMappableBlockLoader {
}, 1000, 30000);
// It is expected that no pmem cache space is used.
assertEquals(0, cacheManager.getPmemCacheUsed());
assertEquals(0, cacheManager.getCacheUsed());
// No record should be kept by blockKeyToVolume after testFile is uncached.
assertEquals(blockKeyToVolume.size(), 0);
}

2
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/TestFsDatasetCache.java
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@ -63,7 +63,7 @@ import org.apache.hadoop.hdfs.server.datanode.DataNode;
import org.apache.hadoop.hdfs.server.datanode.DataNodeFaultInjector;
import org.apache.hadoop.hdfs.server.datanode.InternalDataNodeTestUtils;
import org.apache.hadoop.hdfs.server.datanode.fsdataset.FsDatasetSpi;
import org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.MemoryCacheStats.PageRounder;
import org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.CacheStats.PageRounder;
import org.apache.hadoop.hdfs.server.namenode.FSImage;
import org.apache.hadoop.hdfs.server.namenode.NameNode;
import org.apache.hadoop.hdfs.server.protocol.BlockIdCommand;