| /* |
| * 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.cassandra.service.disk.usage; |
| |
| import java.io.IOException; |
| import java.math.BigDecimal; |
| import java.math.BigInteger; |
| import java.math.RoundingMode; |
| import java.nio.file.FileStore; |
| import java.nio.file.Files; |
| import java.util.Collection; |
| import java.util.Map; |
| import java.util.concurrent.TimeUnit; |
| import java.util.function.Consumer; |
| import java.util.function.Supplier; |
| |
| import com.google.common.annotations.VisibleForTesting; |
| import com.google.common.collect.HashMultimap; |
| import com.google.common.collect.Multimap; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import org.apache.cassandra.concurrent.ScheduledExecutors; |
| import org.apache.cassandra.config.CassandraRelevantProperties; |
| import org.apache.cassandra.config.DataStorageSpec; |
| import org.apache.cassandra.db.ColumnFamilyStore; |
| import org.apache.cassandra.db.Directories; |
| import org.apache.cassandra.db.guardrails.Guardrails; |
| import org.apache.cassandra.db.guardrails.GuardrailsConfig; |
| import org.apache.cassandra.db.memtable.Memtable; |
| import org.apache.cassandra.io.util.FileUtils; |
| |
| /** |
| * Schedule periodic task to monitor local disk usage and notify {@link DiskUsageBroadcaster} if local state changed. |
| */ |
| public class DiskUsageMonitor |
| { |
| private static final Logger logger = LoggerFactory.getLogger(DiskUsageMonitor.class); |
| |
| public static DiskUsageMonitor instance = new DiskUsageMonitor(); |
| |
| private final Supplier<GuardrailsConfig> guardrailsConfigSupplier = () -> Guardrails.CONFIG_PROVIDER.getOrCreate(null); |
| private final Supplier<Multimap<FileStore, Directories.DataDirectory>> dataDirectoriesSupplier; |
| |
| private volatile DiskUsageState localState = DiskUsageState.NOT_AVAILABLE; |
| |
| @VisibleForTesting |
| public DiskUsageMonitor() |
| { |
| this.dataDirectoriesSupplier = DiskUsageMonitor::dataDirectoriesGroupedByFileStore; |
| } |
| |
| @VisibleForTesting |
| public DiskUsageMonitor(Supplier<Multimap<FileStore, Directories.DataDirectory>> dataDirectoriesSupplier) |
| { |
| this.dataDirectoriesSupplier = dataDirectoriesSupplier; |
| } |
| |
| /** |
| * Start monitoring local disk usage and call notifier when local disk usage state changed. |
| */ |
| public void start(Consumer<DiskUsageState> notifier) |
| { |
| // start the scheduler regardless guardrail is enabled, so we can enable it later without a restart |
| ScheduledExecutors.scheduledTasks.scheduleAtFixedRate(() -> { |
| |
| if (!Guardrails.localDataDiskUsage.enabled(null)) |
| return; |
| |
| updateLocalState(getDiskUsage(), notifier); |
| }, 0, CassandraRelevantProperties.DISK_USAGE_MONITOR_INTERVAL_MS.getLong(), TimeUnit.MILLISECONDS); |
| } |
| |
| @VisibleForTesting |
| public void updateLocalState(double usageRatio, Consumer<DiskUsageState> notifier) |
| { |
| double percentage = usageRatio * 100; |
| long percentageCeiling = (long) Math.ceil(percentage); |
| |
| DiskUsageState state = getState(percentageCeiling); |
| |
| Guardrails.localDataDiskUsage.guard(percentageCeiling, state.toString(), false, null); |
| |
| // if state remains unchanged, no need to notify peers |
| if (state == localState) |
| return; |
| |
| localState = state; |
| notifier.accept(state); |
| } |
| |
| /** |
| * @return local node disk usage state |
| */ |
| @VisibleForTesting |
| public DiskUsageState state() |
| { |
| return localState; |
| } |
| |
| /** |
| * @return The current disk usage (including all memtable sizes) ratio. This is the ratio between the space taken by |
| * all the data directories and the addition of that same space and the free available space on disk. The space |
| * taken by the data directories is the addition of the actual space on disk plus the size of the memtables. |
| * Memtables are included in that calculation because they are expected to be eventually flushed to disk. |
| */ |
| @VisibleForTesting |
| public double getDiskUsage() |
| { |
| // using BigInteger to handle large file system |
| BigInteger used = BigInteger.ZERO; // space used by data directories |
| BigInteger usable = BigInteger.ZERO; // free space on disks |
| |
| for (Map.Entry<FileStore, Collection<Directories.DataDirectory>> e : dataDirectoriesSupplier.get().asMap().entrySet()) |
| { |
| usable = usable.add(BigInteger.valueOf(usableSpace(e.getKey()))); |
| |
| for (Directories.DataDirectory dir : e.getValue()) |
| used = used.add(BigInteger.valueOf(dir.getRawSize())); |
| } |
| |
| // The total disk size for data directories is the space that is actually used by those directories plus the |
| // free space on disk that might be used for storing those directories in the future. |
| BigInteger total = used.add(usable); |
| |
| // That total space can be limited by the config property data_disk_usage_max_disk_size. |
| DataStorageSpec.LongBytesBound diskUsageMaxSize = guardrailsConfigSupplier.get().getDataDiskUsageMaxDiskSize(); |
| if (diskUsageMaxSize != null) |
| total = total.min(BigInteger.valueOf(diskUsageMaxSize.toBytes())); |
| |
| // Add memtables size to the amount of used space because those memtables will be flushed to data directories. |
| used = used.add(BigInteger.valueOf(getAllMemtableSize())); |
| |
| if (logger.isTraceEnabled()) |
| logger.trace("Disk Usage Guardrail: current disk usage = {}, total disk usage = {}.", |
| FileUtils.stringifyFileSize(used.doubleValue()), |
| FileUtils.stringifyFileSize(total.doubleValue())); |
| |
| return new BigDecimal(used).divide(new BigDecimal(total), 5, RoundingMode.UP).doubleValue(); |
| } |
| |
| @VisibleForTesting |
| public long getAllMemtableSize() |
| { |
| long size = 0; |
| |
| for (ColumnFamilyStore cfs : ColumnFamilyStore.all()) |
| { |
| for (Memtable memtable : cfs.getTracker().getView().getAllMemtables()) |
| { |
| size += memtable.getLiveDataSize(); |
| } |
| } |
| |
| return size; |
| } |
| |
| @VisibleForTesting |
| public DiskUsageState getState(long usagePercentage) |
| { |
| if (!Guardrails.localDataDiskUsage.enabled()) |
| return DiskUsageState.NOT_AVAILABLE; |
| |
| if (Guardrails.localDataDiskUsage.failsOn(usagePercentage, null)) |
| return DiskUsageState.FULL; |
| |
| if (Guardrails.localDataDiskUsage.warnsOn(usagePercentage, null)) |
| return DiskUsageState.STUFFED; |
| |
| return DiskUsageState.SPACIOUS; |
| } |
| |
| private static Multimap<FileStore, Directories.DataDirectory> dataDirectoriesGroupedByFileStore() |
| { |
| Multimap<FileStore, Directories.DataDirectory> directories = HashMultimap.create(); |
| try |
| { |
| for (Directories.DataDirectory dir : Directories.dataDirectories.getAllDirectories()) |
| { |
| FileStore store = Files.getFileStore(dir.location.toPath()); |
| directories.put(store, dir); |
| } |
| } |
| catch (IOException e) |
| { |
| throw new RuntimeException("Cannot get data directories grouped by file store", e); |
| } |
| return directories; |
| } |
| |
| public static long totalDiskSpace() |
| { |
| BigInteger size = dataDirectoriesGroupedByFileStore().keys() |
| .stream() |
| .map(DiskUsageMonitor::totalSpace) |
| .map(BigInteger::valueOf) |
| .reduce(BigInteger.ZERO, BigInteger::add); |
| |
| return size.compareTo(BigInteger.valueOf(Long.MAX_VALUE)) >= 0 |
| ? Long.MAX_VALUE |
| : size.longValue(); |
| } |
| |
| public static long totalSpace(FileStore store) |
| { |
| try |
| { |
| long size = store.getTotalSpace(); |
| return size < 0 ? Long.MAX_VALUE : size; |
| } |
| catch (IOException e) |
| { |
| throw new RuntimeException("Cannot get total space of file store", e); |
| } |
| } |
| |
| public static long usableSpace(FileStore store) |
| { |
| try |
| { |
| long size = store.getUsableSpace(); |
| return size < 0 ? Long.MAX_VALUE : size; |
| } |
| catch (IOException e) |
| { |
| throw new RuntimeException("Cannot get usable size of file store", e); |
| } |
| } |
| } |
| |