MAPREDUCE-6995. Uploader tool for Distributed Cache Deploy documentation (miklos.szegedi@cloudera.com via rkanter)
This commit is contained in:
Robert Kanter
parent
62c9e7fa99
commit
836643d793
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@ -12,10 +12,6 @@
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limitations under the License. See accompanying LICENSE file.
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-->
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#set ( $H3 = '###' )
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#set ( $H4 = '####' )
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#set ( $H5 = '#####' )
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Hadoop: Distributed Cache Deploy
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================================
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@ -55,23 +51,41 @@ Deploying a new MapReduce version consists of three steps:
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1. Upload the MapReduce archive to a location that can be accessed by the
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job submission client. Ideally the archive should be on the cluster's default
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filesystem at a publicly-readable path. See the archive location discussion
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below for more details.
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below for more details. You can use the framework uploader tool to perform
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this step like
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`mapred frameworkuploader -target
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hdfs:///mapred/framework/hadoop-mapreduce-${project.version}.tar#mrframework`.
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It will select the jar files that are in the classpath and put them into
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a tar archive specified by the -target and -fs options. The tool then returns
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a suggestion of how to set `mapreduce.application.framework.path` and
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`mapreduce.application.classpath`.
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`-fs`: The target file system. Defaults to the default filesystem set by
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`fs.defaultFS`.
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`-target` is the target location of the framework tarball, optionally followed
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by a # with the localized alias. It then uploads the tar to the specified
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directory. gzip is not needed since the jar files are already compressed.
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Make sure the target directory is readable by all users but it is not
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writable by others than administrators to protect cluster security.
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2. Configure `mapreduce.application.framework.path` to point to the
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location where the archive is located. As when specifying distributed cache
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files for a job, this is a URL that also supports creating an alias for the
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archive if a URL fragment is specified. For example,
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`hdfs:/mapred/framework/hadoop-mapreduce-${project.version}.tar.gz#mrframework`
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`hdfs:///mapred/framework/hadoop-mapreduce-${project.version}.tar.gz#mrframework`
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will be localized as `mrframework` rather than
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`hadoop-mapreduce-${project.version}.tar.gz`.
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3. Configure `mapreduce.application.classpath` to set the proper
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classpath to use with the MapReduce archive configured above. NOTE: An error
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classpath to use with the MapReduce archive configured above.
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If the `frameworkuploader` tool is used, it uploads all dependencies
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and returns the value that needs to be configured here. NOTE: An error
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occurs if `mapreduce.application.framework.path` is configured but
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`mapreduce.application.classpath` does not reference the base name of the
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archive path or the alias if an alias was specified.
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$H3 Location of the MapReduce Archive and How It Affects Job Performance
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### Location of the MapReduce Archive and How It Affects Job Performance
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Note that the location of the MapReduce archive can be critical to job submission and job startup performance. If the archive is not located on the cluster's default filesystem then it will be copied to the job staging directory for each job and localized to each node where the job's tasks run. This will slow down job submission and task startup performance.
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@ -79,6 +93,16 @@ If the archive is located on the default filesystem then the job client will not
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When working with a large cluster it can be important to increase the replication factor of the archive to increase its availability. This will spread the load when the nodes in the cluster localize the archive for the first time.
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The `frameworkuploader` tool mentioned above has additional parameters that help to adjust performance:
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`-initialReplication`: This is the replication count that the framework tarball is created with. It is safe to leave this value at the default 3. This is the tested scenario.
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`-finalReplication`: The uploader tool sets the replication once all blocks are collected and uploaded. If quick initial startup is required, then it is advised to set this to the commissioned node count divided by two but not more than 512. This will leverage HDFS to spread the tarball in a distributed manner. Once the jobs start they will likely hit a local HDFS node to localize from or they can select from a wide set of additional source nodes. If this is is set to a low value like 10, then the output bandwidth of those replicated nodes will affect how fast the first job will run. The replication count can be manually reduced to a low value like 10 once all the jobs started in the cluster to save disk space.
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`-acceptableReplication`: The tool will wait until the tarball has been replicated this number of times before exiting. This should be a replication count less than or equal to the value in `finalReplication`. This is typically a 90% of the value in `finalReplication` to accomodate failing nodes.
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`-timeout`: A timeout in seconds to wait to reach `acceptableReplication` before the tool exits. The tool logs an error otherwise and returns.
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MapReduce Archives and Classpath Configuration
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----------------------------------------------
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@ -90,7 +114,17 @@ Another possible approach is to have the archive consist of just the MapReduce j
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`$HADOOP_CONF_DIR,$PWD/hadoop-mapreduce-${project.version}.tar.gz/hadoop-mapreduce-${project.version}/share/hadoop/mapreduce/*,$PWD/hadoop-mapreduce-${project.version}.tar.gz/hadoop-mapreduce-${project.version}/share/hadoop/mapreduce/lib/*,$HADOOP_COMMON_HOME/share/hadoop/common/*,$HADOOP_COMMON_HOME/share/hadoop/common/lib/*,$HADOOP_HDFS_HOME/share/hadoop/hdfs/*,$HADOOP_HDFS_HOME/share/hadoop/hdfs/lib/*,$HADOOP_YARN_HOME/share/hadoop/yarn/*,$HADOOP_YARN_HOME/share/hadoop/yarn/lib/*`
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$H3 NOTE:
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The `frameworkuploader` tool has the following arguments to control which jars end up in the framework tarball:
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`-input`: This is the input classpath that is iterated through. jars files found will be added to the tarball. It defaults to the classpath as returned by the `hadoop classpath` command.
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`-blacklist`: This is a comma separated regex array to filter the jar file names to exclude from the class path. It can be used for example to exclude test jars or Hadoop services that are not necessary to localize.
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`-whitelist`: This is a comma separated regex array to include certain jar files. This can be used to provide additional security, so that no external source can include malicious code in the classpath when the tool runs.
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`-nosymlink`: This flag can be used to exclude symlinks that point to the same directory. This is not widely used. For example, `/a/foo.jar` and a symlink `/a/bar.jar` that points to `/a/foo.jar` would normally add `foo.jar` and `bar.jar` to the tarball as separate files despite them actually being the same file. This flag would make the tool exclude `/a/bar.jar` so only one copy of the file is added.
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### NOTE:
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If shuffle encryption is also enabled in the cluster, then we could meet the problem that MR job get failed with exception like below:
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@ -119,3 +153,12 @@ If shuffle encryption is also enabled in the cluster, then we could meet the pro
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....
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This is because MR client (deployed from HDFS) cannot access ssl-client.xml in local FS under directory of $HADOOP\_CONF\_DIR. To fix the problem, we can add the directory with ssl-client.xml to the classpath of MR which is specified in "mapreduce.application.classpath" as mentioned above. To avoid MR application being affected by other local configurations, it is better to create a dedicated directory for putting ssl-client.xml, e.g. a sub-directory under $HADOOP\_CONF\_DIR, like: $HADOOP\_CONF\_DIR/security.
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The framework upload tool can be use to collect cluster jars that the MapReduce
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AM, mappers and reducers will use.
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It returns logs that provide the suggested configuration values
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INFO uploader.FrameworkUploader: Uploaded hdfs://mynamenode/mapred/framework/mr-framework.tar#mr-framework
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INFO uploader.FrameworkUploader: Suggested mapreduce.application.classpath $PWD/mr-framework/*
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Set `mapreduce.application.framework.path` to the first and `mapreduce.application.classpath` to the second logged value above respectively.
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@ -162,4 +162,23 @@ Usage: `mapred hsadmin [-refreshUserToGroupsMappings] | [-refreshSuperUserGroups
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| -getGroups [username] | Get the groups which given user belongs to |
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| -help [cmd] | Displays help for the given command or all commands if none is specified. |
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### `frameworkuploader`
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Collects framework jars and uploads them to HDFS as a tarball.
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Usage: `mapred frameworkuploader -target <target> [-fs <filesystem>] [-input <classpath>] [-blacklist <list>] [-whitelist <list>] [-initialReplication <num>] [-acceptableReplication <num>] [-finalReplication <num>] [-timeout <seconds>] [-nosymlink]`
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| COMMAND\_OPTION | Description |
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|:---- |:---- |
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| -input *classpath* | This is the input classpath that is searched for jar files to be included in the tarball. |
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| -fs *filesystem* | The target file system. Defaults to the default filesystem set by fs.defaultFS. |
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| -target *target* | This is the target location of the framework tarball, optionally followed by a # with the localized alias. An example would be /usr/lib/framework.tar#framework. Make sure the target directory is readable by all users but it is not writable by others than administrators to protect cluster security.
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| -blacklist *list* | This is a comma separated regex array to filter the jar file names to exclude from the class path. It can be used for example to exclude test jars or Hadoop services that are not necessary to localize. |
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| -whitelist *list* | This is a comma separated regex array to include certain jar files. This can be used to provide additional security, so that no external source can include malicious code in the classpath when the tool runs. |
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| -nosymlink | This flag can be used to exclude symlinks that point to the same directory. This is not widely used. For example, `/a/foo.jar` and a symlink `/a/bar.jar` that points to `/a/foo.jar` would normally add `foo.jar` and `bar.jar` to the tarball as separate files despite them actually being the same file. This flag would make the tool exclude `/a/bar.jar` so only one copy of the file is added. |
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| -initialReplication *num* | This is the replication count that the framework tarball is created with. It is safe to leave this value at the default 3. This is the tested scenario. |
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| -finalReplication *num* | The uploader tool sets the replication once all blocks are collected and uploaded. If quick initial startup is required, then it is advised to set this to the commissioned node count divided by two but not more than 512. |
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| -acceptableReplication *num* | The tool will wait until the tarball has been replicated this number of times before exiting. This should be a replication count less than or equal to the value in `finalReplication`. This is typically a 90% of the value in `finalReplication` to accomodate failing nodes. |
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| -timeout *seconds* | A timeout in seconds to wait to reach `acceptableReplication` before the tool exits. The tool logs an error otherwise and returns.
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@ -56,6 +56,8 @@
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import java.util.regex.Pattern;
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import java.util.zip.GZIPOutputStream;
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import static org.apache.hadoop.fs.FileSystem.FS_DEFAULT_NAME_KEY;
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/**
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* Upload a MapReduce framework tarball to HDFS.
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* Usage:
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@ -67,6 +69,7 @@ public class FrameworkUploader implements Runnable {
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Pattern.compile(Shell.getEnvironmentVariableRegex());
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private static final Logger LOG =
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LoggerFactory.getLogger(FrameworkUploader.class);
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private Configuration conf = new Configuration();
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@VisibleForTesting
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String input = null;
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@ -98,6 +101,11 @@ public class FrameworkUploader implements Runnable {
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private OutputStream targetStream = null;
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private String alias = null;
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@VisibleForTesting
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void setConf(Configuration configuration) {
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conf = configuration;
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}
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private void printHelp(Options options) {
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HelpFormatter formatter = new HelpFormatter();
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formatter.printHelp("mapred frameworkuploader", options);
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@ -168,7 +176,7 @@ void beginUpload() throws IOException, UploaderException {
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target.substring(lastIndex + 1) :
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targetPath.getName();
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LOG.info("Target " + targetPath);
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FileSystem fileSystem = targetPath.getFileSystem(new Configuration());
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FileSystem fileSystem = targetPath.getFileSystem(conf);
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targetStream = null;
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if (fileSystem instanceof DistributedFileSystem) {
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@ -205,7 +213,7 @@ void beginUpload() throws IOException, UploaderException {
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private long getSmallestReplicatedBlockCount()
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throws IOException {
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FileSystem fileSystem = targetPath.getFileSystem(new Configuration());
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FileSystem fileSystem = targetPath.getFileSystem(conf);
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FileStatus status = fileSystem.getFileStatus(targetPath);
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long length = status.getLen();
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HashMap<Long, Integer> blockCount = new HashMap<>();
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@ -221,7 +229,8 @@ private long getSmallestReplicatedBlockCount()
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for(BlockLocation location: locations) {
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final int replicas = location.getHosts().length;
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blockCount.compute(
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location.getOffset(), (key, value) -> value + replicas);
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location.getOffset(),
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(key, value) -> value == null ? 0 : value + replicas);
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}
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// Print out the results
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@ -236,7 +245,7 @@ private long getSmallestReplicatedBlockCount()
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private void endUpload()
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throws IOException, InterruptedException {
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FileSystem fileSystem = targetPath.getFileSystem(new Configuration());
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FileSystem fileSystem = targetPath.getFileSystem(conf);
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if (fileSystem instanceof DistributedFileSystem) {
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fileSystem.setReplication(targetPath, finalReplication);
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LOG.info("Set replication to " +
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@ -428,7 +437,7 @@ boolean parseArguments(String[] args) throws IOException {
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opts.addOption(OptionBuilder.create("h"));
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opts.addOption(OptionBuilder.create("help"));
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opts.addOption(OptionBuilder
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.withDescription("Input class path")
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.withDescription("Input class path. Defaults to the default classpath.")
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.hasArg().create("input"));
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opts.addOption(OptionBuilder
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.withDescription(
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@ -502,20 +511,33 @@ boolean parseArguments(String[] args) throws IOException {
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}
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String fs = parser.getCommandLine()
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.getOptionValue("fs", null);
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String path = parser.getCommandLine().getOptionValue("target",
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"/usr/lib/mr-framework.tar.gz#mr-framework");
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boolean isFullPath =
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path.startsWith("hdfs://") ||
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path.startsWith("file://");
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if (fs == null) {
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LOG.error("Target file system not specified");
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fs = conf.get(FS_DEFAULT_NAME_KEY);
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if (fs == null && !isFullPath) {
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LOG.error("No filesystem specified in either fs or target.");
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printHelp(opts);
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return false;
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} else {
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LOG.info(String.format(
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"Target file system not specified. Using default %s", fs));
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}
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String path = parser.getCommandLine().getOptionValue("target",
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"mr-framework.tar.gz#mr-framework");
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if (path == null) {
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}
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if (path.isEmpty()) {
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LOG.error("Target directory not specified");
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printHelp(opts);
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return false;
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}
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StringBuilder absolutePath = new StringBuilder(fs);
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absolutePath = absolutePath.append(path.startsWith("/") ? "" : "/");
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StringBuilder absolutePath = new StringBuilder();
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if (!isFullPath) {
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absolutePath.append(fs);
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absolutePath.append(path.startsWith("/") ? "" : "/");
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}
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absolutePath.append(path);
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target = absolutePath.toString();
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@ -23,6 +23,7 @@
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import org.apache.commons.compress.archivers.tar.TarArchiveInputStream;
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import org.apache.commons.io.FileUtils;
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import org.apache.commons.io.IOUtils;
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import org.apache.hadoop.conf.Configuration;
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import org.junit.Assert;
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import org.junit.Assume;
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import org.junit.Before;
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@ -44,6 +45,8 @@
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import java.util.Set;
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import java.util.zip.GZIPInputStream;
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import static org.apache.hadoop.fs.FileSystem.FS_DEFAULT_NAME_KEY;
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/**
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* Unit test class for FrameworkUploader.
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*/
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@ -129,6 +132,75 @@ public void testArguments() throws IOException {
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uploader.timeout);
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}
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/**
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* Test the default ways how to specify filesystems.
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*/
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@Test
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public void testNoFilesystem() throws IOException {
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FrameworkUploader uploader = new FrameworkUploader();
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boolean success = uploader.parseArguments(new String[]{});
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Assert.assertTrue("Expected to parse arguments", success);
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Assert.assertEquals(
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"Expected",
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"file:////usr/lib/mr-framework.tar.gz#mr-framework", uploader.target);
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}
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/**
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* Test the default ways how to specify filesystems.
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*/
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@Test
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public void testDefaultFilesystem() throws IOException {
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FrameworkUploader uploader = new FrameworkUploader();
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Configuration conf = new Configuration();
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conf.set(FS_DEFAULT_NAME_KEY, "hdfs://namenode:555");
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uploader.setConf(conf);
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boolean success = uploader.parseArguments(new String[]{});
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Assert.assertTrue("Expected to parse arguments", success);
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Assert.assertEquals(
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"Expected",
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"hdfs://namenode:555/usr/lib/mr-framework.tar.gz#mr-framework",
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uploader.target);
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}
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/**
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* Test the explicit filesystem specification.
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*/
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@Test
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public void testExplicitFilesystem() throws IOException {
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FrameworkUploader uploader = new FrameworkUploader();
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Configuration conf = new Configuration();
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uploader.setConf(conf);
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boolean success = uploader.parseArguments(new String[]{
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"-target",
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"hdfs://namenode:555/usr/lib/mr-framework.tar.gz#mr-framework"
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});
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Assert.assertTrue("Expected to parse arguments", success);
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Assert.assertEquals(
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"Expected",
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"hdfs://namenode:555/usr/lib/mr-framework.tar.gz#mr-framework",
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uploader.target);
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}
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/**
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* Test the conflicting filesystem specification.
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*/
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@Test
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public void testConflictingFilesystem() throws IOException {
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FrameworkUploader uploader = new FrameworkUploader();
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Configuration conf = new Configuration();
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conf.set(FS_DEFAULT_NAME_KEY, "hdfs://namenode:555");
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uploader.setConf(conf);
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boolean success = uploader.parseArguments(new String[]{
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"-target",
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"file:///usr/lib/mr-framework.tar.gz#mr-framework"
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});
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Assert.assertTrue("Expected to parse arguments", success);
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Assert.assertEquals(
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"Expected",
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"file:///usr/lib/mr-framework.tar.gz#mr-framework",
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uploader.target);
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}
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/**
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* Test whether we can filter a class path properly.
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* @throws IOException test failure
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