MAPREDUCE-6495. Docs for archive-logs tool (rkanter)
(cherry picked from commit 0c4af0f998)
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Robert Kanter
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@ -331,6 +331,8 @@ Release 2.8.0 - UNRELEASED
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MAPREDUCE-6302. Preempt reducers after a configurable timeout irrespective
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of headroom. (kasha)
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MAPREDUCE-6495. Docs for archive-logs tool (rkanter)
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Release 2.7.2 - UNRELEASED
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INCOMPATIBLE CHANGES
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@ -18,6 +18,7 @@ MapReduce Commands Guide
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* [Overview](#Overview)
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* [User Commands](#User_Commands)
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* [archive](#archive)
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* [archive-logs](#archive-logs)
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* [classpath](#classpath)
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* [distcp](#distcp)
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* [job](#job)
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@ -53,6 +54,12 @@ Commands useful for users of a hadoop cluster.
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Creates a hadoop archive. More information can be found at
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[Hadoop Archives Guide](../../hadoop-archives/HadoopArchives.html).
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### `archive-logs`
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A tool to combine YARN aggregated logs into Hadoop archives to reduce the number
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of files in HDFS. More information can be found at
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[Hadoop Archive Logs Guide](../../hadoop-archive-logs/HadoopArchiveLogs.html).
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### `classpath`
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Usage: `yarn classpath [--glob |--jar <path> |-h |--help]`
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@ -154,6 +154,7 @@
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<menu name="Tools" inherit="top">
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<item name="Hadoop Streaming" href="hadoop-streaming/HadoopStreaming.html"/>
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<item name="Hadoop Archives" href="hadoop-archives/HadoopArchives.html"/>
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<item name="Hadoop Archive Logs" href="hadoop-archive-logs/HadoopArchiveLogs.html"/>
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<item name="DistCp" href="hadoop-distcp/DistCp.html"/>
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<item name="GridMix" href="hadoop-gridmix/GridMix.html"/>
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<item name="Rumen" href="hadoop-rumen/Rumen.html"/>
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@ -221,7 +221,7 @@ private void handleOpts(String[] args) throws ParseException {
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CommandLine commandLine = parser.parse(opts, args);
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if (commandLine.hasOption(HELP_OPTION)) {
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HelpFormatter formatter = new HelpFormatter();
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formatter.printHelp("yarn archive-logs", opts);
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formatter.printHelp("mapred archive-logs", opts);
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System.exit(0);
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}
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if (commandLine.hasOption(MAX_ELIGIBLE_APPS_OPTION)) {
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@ -254,7 +254,7 @@ private void handleOpts(String[] args) throws ParseException {
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}
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} catch (ParseException pe) {
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HelpFormatter formatter = new HelpFormatter();
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formatter.printHelp("yarn archive-logs", opts);
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formatter.printHelp("mapred archive-logs", opts);
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throw pe;
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}
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}
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@ -0,0 +1,85 @@
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<!---
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License. See accompanying LICENSE file.
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-->
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Hadoop Archive Logs Guide
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=========================
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- [Overview](#Overview)
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- [How to Archive Logs](#How_to_Archive_Logs)
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Overview
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--------
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For clusters with a lot of Yarn aggregated logs, it can be helpful to combine
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them into hadoop archives in order to reduce the number of small files, and
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hence the stress on the NameNode. This tool provides an easy way to do this.
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Aggregated logs in hadoop archives can still be read by the Job History Server
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and by the `yarn logs` command.
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For more on hadoop archives, see
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[Hadoop Archives Guide](../hadoop-archives/HadoopArchives.html).
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How to Archive Logs
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-------------------
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usage: mapred archive-logs
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-force Force recreating the working directory if
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an existing one is found. This should
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only be used if you know that another
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instance is not currently running
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-help Prints this message
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-maxEligibleApps <n> The maximum number of eligible apps to
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process (default: -1 (all))
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-maxTotalLogsSize <megabytes> The maximum total logs size (in
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megabytes) required to be eligible
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(default: 1024)
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-memory <megabytes> The amount of memory (in megabytes) for
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each container (default: 1024)
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-minNumberLogFiles <n> The minimum number of log files required
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to be eligible (default: 20)
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-verbose Print more details.
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The tool only supports running one instance on a cluster at a time in order
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to prevent conflicts. It does this by checking for the existance of a
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directory named ``archive-logs-work`` under
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``yarn.nodemanager.remote-app-log-dir`` in HDFS
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(default: ``/tmp/logs/archive-logs-work``). If for some reason that
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directory was not cleaned up properly, and the tool refuses to run, you can
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force it with the ``-force`` option.
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The ``-help`` option prints out the usage information.
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The tool works by performing the following procedure:
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1. Determine the list of eligible applications, based on the following
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criteria:
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- is not already archived
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- its aggregation status has successfully completed
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- has at least ``-minNumberLogFiles`` log files
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- the sum of its log files size is less than ``-maxTotalLogsSize`` megabytes
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2. If there are are more than ``-maxEligibleApps`` applications found, the
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newest applications are dropped. They can be processed next time.
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3. A shell script is generated based on the eligible applications
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4. The Distributed Shell program is run with the aformentioned script. It
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will run with ``-maxEligibleApps`` containers, one to process each
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application, and with ``-memory`` megabytes of memory. Each container runs
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the ``hadoop archives`` command for a single application and replaces
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its aggregated log files with the resulting archive.
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The ``-verbose`` option makes the tool print more details about what it's
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doing.
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The end result of running the tool is that the original aggregated log files for
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a processed application will be replaced by a hadoop archive containing all of
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those logs.
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@ -0,0 +1,30 @@
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/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#banner {
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height: 93px;
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background: none;
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}
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#bannerLeft img {
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margin-left: 30px;
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margin-top: 10px;
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}
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#bannerRight img {
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margin: 17px;
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}
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