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YARN-2619. Added NodeManager support for disk io isolation through cg…
…roups. Contributed by Varun Vasudev and Wei Yan.
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170 changes: 170 additions & 0 deletions
170
.../server/nodemanager/containermanager/linux/resources/CGroupsBlkioResourceHandlerImpl.java
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| /** | ||
| * 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. | ||
| */ | ||
|
|
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| package org.apache.hadoop.yarn.server.nodemanager.containermanager.linux.resources; | ||
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| import com.google.common.annotations.VisibleForTesting; | ||
| import org.apache.commons.logging.Log; | ||
| import org.apache.commons.logging.LogFactory; | ||
| import org.apache.hadoop.classification.InterfaceAudience; | ||
| import org.apache.hadoop.classification.InterfaceStability; | ||
| import org.apache.hadoop.conf.Configuration; | ||
| import org.apache.hadoop.util.Shell; | ||
| import org.apache.hadoop.yarn.api.records.ContainerId; | ||
| import org.apache.hadoop.yarn.server.nodemanager.containermanager.container.Container; | ||
| import org.apache.hadoop.yarn.server.nodemanager.containermanager.linux.privileged.PrivilegedOperation; | ||
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|
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| import java.io.File; | ||
| import java.io.IOException; | ||
| import java.nio.file.Files; | ||
| import java.nio.file.Paths; | ||
| import java.util.ArrayList; | ||
| import java.util.List; | ||
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|
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| /** | ||
| * Handler class to handle the blkio controller. Currently it splits resources | ||
| * evenly across all containers. Once we have scheduling sorted out, we can | ||
| * modify the function to represent the disk resources allocated. | ||
| */ | ||
| @InterfaceAudience.Private | ||
| @InterfaceStability.Unstable | ||
| public class CGroupsBlkioResourceHandlerImpl implements DiskResourceHandler { | ||
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| static final Log LOG = LogFactory | ||
| .getLog(CGroupsBlkioResourceHandlerImpl.class); | ||
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| private CGroupsHandler cGroupsHandler; | ||
| // Arbitrarily choose a weight - all that matters is that all containers | ||
| // get the same weight assigned to them. Once we have scheduling support | ||
| // this number will be determined dynamically for each container. | ||
| @VisibleForTesting | ||
| static final String DEFAULT_WEIGHT = "500"; | ||
| private static final String PARTITIONS_FILE = "/proc/partitions"; | ||
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| CGroupsBlkioResourceHandlerImpl(CGroupsHandler cGroupsHandler) { | ||
| this.cGroupsHandler = cGroupsHandler; | ||
| // check for linux so that we don't print messages for tests running on | ||
| // other platforms | ||
| if(Shell.LINUX) { | ||
| checkDiskScheduler(); | ||
| } | ||
| } | ||
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| private void checkDiskScheduler() { | ||
| String data; | ||
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| // read /proc/partitions and check to make sure that sd* and hd* | ||
| // are using the CFQ scheduler. If they aren't print a warning | ||
| try { | ||
| byte[] contents = Files.readAllBytes(Paths.get(PARTITIONS_FILE)); | ||
| data = new String(contents, "UTF-8").trim(); | ||
| } catch (IOException e) { | ||
| String msg = "Couldn't read " + PARTITIONS_FILE + | ||
| "; can't determine disk scheduler type"; | ||
| LOG.warn(msg, e); | ||
| return; | ||
| } | ||
| String[] lines = data.split(System.lineSeparator()); | ||
| if (lines.length > 0) { | ||
| for (String line : lines) { | ||
| String[] columns = line.split("\\s+"); | ||
| if (columns.length > 4) { | ||
| String partition = columns[4]; | ||
| // check some known partitions to make sure the disk scheduler | ||
| // is cfq - not meant to be comprehensive, more a sanity check | ||
| if (partition.startsWith("sd") || partition.startsWith("hd") | ||
| || partition.startsWith("vd") || partition.startsWith("xvd")) { | ||
| String schedulerPath = | ||
| "/sys/block/" + partition + "/queue/scheduler"; | ||
| File schedulerFile = new File(schedulerPath); | ||
| if (schedulerFile.exists()) { | ||
| try { | ||
| byte[] contents = Files.readAllBytes(Paths.get(schedulerPath)); | ||
| String schedulerString = new String(contents, "UTF-8").trim(); | ||
| if (!schedulerString.contains("[cfq]")) { | ||
| LOG.warn("Device " + partition + " does not use the CFQ" | ||
| + " scheduler; disk isolation using " | ||
| + "CGroups will not work on this partition."); | ||
| } | ||
| } catch (IOException ie) { | ||
| LOG.warn( | ||
| "Unable to determine disk scheduler type for partition " | ||
| + partition, ie); | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } | ||
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| @Override | ||
| public List<PrivilegedOperation> bootstrap(Configuration configuration) | ||
| throws ResourceHandlerException { | ||
| // if bootstrap is called on this class, disk is already enabled | ||
| // so no need to check again | ||
| this.cGroupsHandler | ||
| .mountCGroupController(CGroupsHandler.CGroupController.BLKIO); | ||
| return null; | ||
| } | ||
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| @Override | ||
| public List<PrivilegedOperation> preStart(Container container) | ||
| throws ResourceHandlerException { | ||
|
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| String cgroupId = container.getContainerId().toString(); | ||
| cGroupsHandler | ||
| .createCGroup(CGroupsHandler.CGroupController.BLKIO, cgroupId); | ||
| try { | ||
| cGroupsHandler.updateCGroupParam(CGroupsHandler.CGroupController.BLKIO, | ||
| cgroupId, CGroupsHandler.CGROUP_PARAM_BLKIO_WEIGHT, DEFAULT_WEIGHT); | ||
| } catch (ResourceHandlerException re) { | ||
| cGroupsHandler.deleteCGroup(CGroupsHandler.CGroupController.BLKIO, | ||
| cgroupId); | ||
| LOG.warn("Could not update cgroup for container", re); | ||
| throw re; | ||
| } | ||
| List<PrivilegedOperation> ret = new ArrayList<>(); | ||
| ret.add(new PrivilegedOperation( | ||
| PrivilegedOperation.OperationType.ADD_PID_TO_CGROUP, | ||
| PrivilegedOperation.CGROUP_ARG_PREFIX | ||
| + cGroupsHandler.getPathForCGroupTasks( | ||
| CGroupsHandler.CGroupController.BLKIO, cgroupId))); | ||
| return ret; | ||
| } | ||
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| @Override | ||
| public List<PrivilegedOperation> reacquireContainer(ContainerId containerId) | ||
| throws ResourceHandlerException { | ||
| return null; | ||
| } | ||
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| @Override | ||
| public List<PrivilegedOperation> postComplete(ContainerId containerId) | ||
| throws ResourceHandlerException { | ||
| cGroupsHandler.deleteCGroup(CGroupsHandler.CGroupController.BLKIO, | ||
| containerId.toString()); | ||
| return null; | ||
| } | ||
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| @Override | ||
| public List<PrivilegedOperation> teardown() throws ResourceHandlerException { | ||
| return null; | ||
| } | ||
| } |
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