HDFS-6712. Document HDFS Multihoming Settings. (Contributed by Arpit Agarwal)
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Arpit Agarwal
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@ -602,6 +602,8 @@ Release 2.5.0 - UNRELEASED
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HDFS-6680. BlockPlacementPolicyDefault does not choose favored nodes
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correctly. (szetszwo)
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HDFS-6712. Document HDFS Multihoming Settings. (Arpit Agarwal)
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OPTIMIZATIONS
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HDFS-6214. Webhdfs has poor throughput for files >2GB (daryn)
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@ -0,0 +1,145 @@
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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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~~
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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. See accompanying LICENSE file.
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---
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Hadoop Distributed File System-${project.version} - Support for Multi-Homed Networks
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---
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---
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${maven.build.timestamp}
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HDFS Support for Multihomed Networks
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This document is targetted to cluster administrators deploying <<<HDFS>>> in
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multihomed networks. Similar support for <<<YARN>>>/<<<MapReduce>>> is
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work in progress and will be documented when available.
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%{toc|section=1|fromDepth=0}
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* Multihoming Background
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In multihomed networks the cluster nodes are connected to more than one
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network interface. There could be multiple reasons for doing so.
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[[1]] <<Security>>: Security requirements may dictate that intra-cluster
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traffic be confined to a different network than the network used to
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transfer data in and out of the cluster.
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[[2]] <<Performance>>: Intra-cluster traffic may use one or more high bandwidth
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interconnects like Fiber Channel, Infiniband or 10GbE.
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[[3]] <<Failover/Redundancy>>: The nodes may have multiple network adapters
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connected to a single network to handle network adapter failure.
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Note that NIC Bonding (also known as NIC Teaming or Link
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Aggregation) is a related but separate topic. The following settings
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are usually not applicable to a NIC bonding configuration which handles
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multiplexing and failover transparently while presenting a single 'logical
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network' to applications.
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* Fixing Hadoop Issues In Multihomed Environments
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** Ensuring HDFS Daemons Bind All Interfaces
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By default <<<HDFS>>> endpoints are specified as either hostnames or IP addresses.
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In either case <<<HDFS>>> daemons will bind to a single IP address making
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the daemons unreachable from other networks.
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The solution is to have separate setting for server endpoints to force binding
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the wildcard IP address <<<INADDR_ANY>>> i.e. <<<0.0.0.0>>>. Do NOT supply a port
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number with any of these settings.
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----
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<property>
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<name>dfs.namenode.rpc-bind-host</name>
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<value>0.0.0.0</value>
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<description>
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The actual address the RPC server will bind to. If this optional address is
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set, it overrides only the hostname portion of dfs.namenode.rpc-address.
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It can also be specified per name node or name service for HA/Federation.
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This is useful for making the name node listen on all interfaces by
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setting it to 0.0.0.0.
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</description>
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</property>
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<property>
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<name>dfs.namenode.servicerpc-bind-host</name>
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<value>0.0.0.0</value>
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<description>
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The actual address the service RPC server will bind to. If this optional address is
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set, it overrides only the hostname portion of dfs.namenode.servicerpc-address.
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It can also be specified per name node or name service for HA/Federation.
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This is useful for making the name node listen on all interfaces by
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setting it to 0.0.0.0.
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</description>
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</property>
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<property>
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<name>dfs.namenode.http-bind-host</name>
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<value>0.0.0.0</value>
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<description>
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The actual adress the HTTP server will bind to. If this optional address
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is set, it overrides only the hostname portion of dfs.namenode.http-address.
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It can also be specified per name node or name service for HA/Federation.
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This is useful for making the name node HTTP server listen on all
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interfaces by setting it to 0.0.0.0.
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</description>
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</property>
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<property>
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<name>dfs.namenode.https-bind-host</name>
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<value>0.0.0.0</value>
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<description>
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The actual adress the HTTPS server will bind to. If this optional address
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is set, it overrides only the hostname portion of dfs.namenode.https-address.
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It can also be specified per name node or name service for HA/Federation.
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This is useful for making the name node HTTPS server listen on all
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interfaces by setting it to 0.0.0.0.
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</description>
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</property>
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----
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** Clients use Hostnames when connecting to DataNodes
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By default <<<HDFS>>> clients connect to DataNodes using the IP address
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provided by the NameNode. Depending on the network configuration this
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IP address may be unreachable by the clients. The fix is letting clients perform
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their own DNS resolution of the DataNode hostname. The following setting
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enables this behavior.
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----
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<property>
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<name>dfs.client.use.datanode.hostname</name>
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<value>true</value>
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<description>Whether clients should use datanode hostnames when
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connecting to datanodes.
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</description>
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</property>
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----
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** DataNodes use HostNames when connecting to other DataNodes
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Rarely, the NameNode-resolved IP address for a DataNode may be unreachable
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from other DataNodes. The fix is to force DataNodes to perform their own
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DNS resolution for inter-DataNode connections. The following setting enables
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this behavior.
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----
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<property>
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<name>dfs.datanode.use.datanode.hostname</name>
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<value>true</value>
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<description>Whether datanodes should use datanode hostnames when
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connecting to other datanodes for data transfer.
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</description>
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</property>
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----
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@ -89,6 +89,7 @@
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<item name="HDFS NFS Gateway" href="hadoop-project-dist/hadoop-hdfs/HdfsNfsGateway.html"/>
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<item name="HDFS Rolling Upgrade" href="hadoop-project-dist/hadoop-hdfs/HdfsRollingUpgrade.html"/>
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<item name="Extended Attributes" href="hadoop-project-dist/hadoop-hdfs/ExtendedAttributes.html"/>
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<item name="HDFS Support for Multihoming" href="hadoop-project-dist/hadoop-hdfs/HdfsMultihoming.html"/>
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</menu>
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<menu name="MapReduce" inherit="top">
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