898 lines
30 KiB
XML
898 lines
30 KiB
XML
<?xml version="1.0"?>
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<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
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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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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.
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-->
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<!-- Do not modify this file directly. Instead, copy entries that you -->
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<!-- wish to modify from this file into hdfs-rbf-site.xml and change them -->
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<!-- there. If hdfs-rbf-site.xml does not already exist, create it. -->
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<configuration>
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<property>
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<name>dfs.federation.router.default.nameserviceId</name>
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<value></value>
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<description>
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Nameservice identifier of the default subcluster to monitor.
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</description>
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</property>
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<property>
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<name>dfs.federation.router.default.nameservice.enable</name>
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<value>true</value>
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<description>
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The default subcluster is enabled to read and write files.
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</description>
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</property>
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<property>
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<name>dfs.federation.router.rpc.enable</name>
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<value>true</value>
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<description>
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If true, the RPC service to handle client requests in the router is
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enabled.
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</description>
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</property>
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<property>
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<name>dfs.federation.router.rpc-address</name>
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<value>0.0.0.0:8888</value>
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<description>
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RPC address that handles all clients requests.
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The value of this property will take the form of router-host1:rpc-port.
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</description>
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</property>
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<property>
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<name>dfs.federation.router.rpc-bind-host</name>
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<value></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
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dfs.federation.router.rpc-address. This is useful for making the name node
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listen on all 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.federation.router.handler.count</name>
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<value>10</value>
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<description>
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The number of server threads for the router to handle RPC requests from
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clients.
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</description>
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</property>
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<property>
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<name>dfs.federation.router.handler.queue.size</name>
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<value>100</value>
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<description>
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The size of the queue for the number of handlers to handle RPC client requests.
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</description>
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</property>
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<property>
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<name>dfs.federation.router.reader.count</name>
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<value>1</value>
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<description>
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The number of readers for the router to handle RPC client requests.
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</description>
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</property>
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<property>
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<name>dfs.federation.router.reader.queue.size</name>
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<value>100</value>
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<description>
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The size of the queue for the number of readers for the router to handle RPC client requests.
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</description>
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</property>
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<property>
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<name>dfs.federation.router.connection.creator.queue-size</name>
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<value>100</value>
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<description>
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Size of async connection creator queue.
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</description>
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</property>
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<property>
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<name>dfs.federation.router.connection.pool-size</name>
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<value>1</value>
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<description>
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Size of the pool of connections from the router to namenodes.
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</description>
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</property>
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<property>
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<name>dfs.federation.router.connection.min-active-ratio</name>
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<value>0.5f</value>
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<description>
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Minimum active ratio of connections from the router to namenodes.
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</description>
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</property>
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<property>
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<name>dfs.federation.router.connection.clean.ms</name>
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<value>10000</value>
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<description>
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Time interval, in milliseconds, to check if the connection pool should
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remove unused connections.
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</description>
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</property>
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<property>
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<name>dfs.federation.router.enable.multiple.socket</name>
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<value>false</value>
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<description>
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If enable multiple downstream socket or not. If true, ConnectionPool
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will use a new socket when creating a new connection for the same user,
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and RouterRPCClient will get a better throughput. It's best used with
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dfs.federation.router.max.concurrency.per.connection together to get
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a better throughput with fewer sockets. Such as enable
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dfs.federation.router.enable.multiple.socket and
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set dfs.federation.router.max.concurrency.per.connection = 20.
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</description>
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</property>
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<property>
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<name>dfs.federation.router.max.concurrency.per.connection</name>
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<value>1</value>
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<description>
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The maximum number of requests that a connection can handle concurrently.
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When the number of requests being processed by a socket is less than this value,
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new request will be processed by this socket. When enable
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dfs.federation.router.enable.multiple.socket, it's best
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set this value greater than 1, such as 20, to avoid frequent
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creation and idle sockets in the case of a NS with jitter requests.
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</description>
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</property>
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<property>
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<name>dfs.federation.router.connection.pool.clean.ms</name>
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<value>60000</value>
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<description>
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Time interval, in milliseconds, to check if the connection manager should
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remove unused connection pools.
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</description>
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</property>
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<property>
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<name>dfs.federation.router.metrics.enable</name>
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<value>true</value>
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<description>
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If the metrics in the router are enabled.
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</description>
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</property>
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<property>
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<name>dfs.federation.router.dn-report.time-out</name>
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<value>1000</value>
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<description>
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Time out, in milliseconds for getDatanodeReport.
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</description>
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</property>
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<property>
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<name>dfs.federation.router.dn-report.cache-expire</name>
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<value>10s</value>
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<description>
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Expiration time in seconds for datanodereport.
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</description>
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</property>
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<property>
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<name>dfs.federation.router.enable.get.dn.usage</name>
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<value>true</value>
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<description>
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If true, the getNodeUsage method in RBFMetrics will return an up-to-date
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result collecting from downstream nameservices. But it will take a long
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time and take up thread resources. If false, it will return a mock result with all 0.
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</description>
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</property>
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<property>
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<name>dfs.federation.router.metrics.class</name>
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<value>org.apache.hadoop.hdfs.server.federation.metrics.FederationRPCPerformanceMonitor</value>
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<description>
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Class to monitor the RPC system in the router. It must implement the
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RouterRpcMonitor interface.
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</description>
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</property>
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<property>
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<name>dfs.federation.router.admin.enable</name>
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<value>true</value>
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<description>
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If true, the RPC admin service to handle client requests in the router is
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enabled.
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</description>
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</property>
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<property>
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<name>dfs.federation.router.admin-address</name>
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<value>0.0.0.0:8111</value>
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<description>
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RPC address that handles the admin requests.
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The value of this property will take the form of router-host1:rpc-port.
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</description>
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</property>
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<property>
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<name>dfs.federation.router.admin-bind-host</name>
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<value></value>
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<description>
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The actual address the RPC admin server will bind to. If this optional
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address is set, it overrides only the hostname portion of
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dfs.federation.router.admin-address. This is useful for making the name
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node listen on all 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.federation.router.admin.handler.count</name>
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<value>1</value>
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<description>
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The number of server threads for the router to handle RPC requests from
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admin.
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</description>
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</property>
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<property>
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<name>dfs.federation.router.admin.mount.check.enable</name>
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<value>false</value>
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<description>
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If true, add/update mount table will include a destination check to make
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sure the file exists in downstream namenodes, and changes to mount table
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will fail if the file doesn't exist in any of the destination namenode.
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</description>
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</property>
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<property>
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<name>dfs.federation.router.http-address</name>
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<value>0.0.0.0:50071</value>
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<description>
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HTTP address that handles the web requests to the Router.
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The value of this property will take the form of router-host1:http-port.
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</description>
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</property>
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<property>
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<name>dfs.federation.router.http-bind-host</name>
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<value></value>
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<description>
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The actual address the HTTP server will bind to. If this optional
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address is set, it overrides only the hostname portion of
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dfs.federation.router.http-address. This is useful for making the name
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node listen on all 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.federation.router.https-address</name>
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<value>0.0.0.0:50072</value>
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<description>
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HTTPS address that handles the web requests to the Router.
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The value of this property will take the form of router-host1:https-port.
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</description>
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</property>
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<property>
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<name>dfs.federation.router.https-bind-host</name>
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<value></value>
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<description>
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The actual address the HTTPS server will bind to. If this optional
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address is set, it overrides only the hostname portion of
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dfs.federation.router.https-address. This is useful for making the name
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node listen on all 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.federation.router.http.enable</name>
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<value>true</value>
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<description>
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If the HTTP service to handle client requests in the router is enabled.
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</description>
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</property>
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<property>
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<name>dfs.federation.router.fs-limits.max-component-length</name>
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<value>0</value>
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<description>
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Defines the maximum number of bytes in UTF-8 encoding in each
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component of a path at Router side. A value of 0 will disable the check.
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Support multiple size unit suffix(case insensitive). It is act as
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configuration dfs.namenode.fs-limits.max-component-length at NameNode
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side.
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</description>
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</property>
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<property>
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<name>dfs.federation.router.file.resolver.client.class</name>
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<value>org.apache.hadoop.hdfs.server.federation.resolver.MountTableResolver</value>
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<description>
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Class to resolve files to subclusters. To enable multiple subclusters for a mount point,
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set to org.apache.hadoop.hdfs.server.federation.resolver.MultipleDestinationMountTableResolver.
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</description>
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</property>
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<property>
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<name>dfs.federation.router.namenode.resolver.client.class</name>
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<value>org.apache.hadoop.hdfs.server.federation.resolver.MembershipNamenodeResolver</value>
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<description>
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Class to resolve the namenode for a subcluster.
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</description>
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</property>
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<property>
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<name>dfs.federation.router.store.enable</name>
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<value>true</value>
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<description>
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If true, the Router connects to the State Store.
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</description>
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</property>
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<property>
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<name>dfs.federation.router.store.serializer</name>
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<value>org.apache.hadoop.hdfs.server.federation.store.driver.impl.StateStoreSerializerPBImpl</value>
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<description>
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Class to serialize State Store records.
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</description>
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</property>
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<property>
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<name>dfs.federation.router.store.driver.class</name>
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<value>org.apache.hadoop.hdfs.server.federation.store.driver.impl.StateStoreZooKeeperImpl</value>
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<description>
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Class to implement the State Store. There are three implementation classes currently
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being supported:
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org.apache.hadoop.hdfs.server.federation.store.driver.impl.StateStoreFileImpl,
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org.apache.hadoop.hdfs.server.federation.store.driver.impl.StateStoreFileSystemImpl and
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org.apache.hadoop.hdfs.server.federation.store.driver.impl.StateStoreZooKeeperImpl.
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These implementation classes use the local file, filesystem and ZooKeeper as a backend respectively.
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By default it uses the ZooKeeper as the default State Store.
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</description>
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</property>
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<property>
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<name>dfs.federation.router.store.connection.test</name>
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<value>60000</value>
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<description>
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How often to check for the connection to the State Store in milliseconds.
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</description>
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</property>
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<property>
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<name>dfs.federation.router.store.driver.zk.parent-path</name>
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<value>/hdfs-federation</value>
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<description>
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The parent path of zookeeper for StateStoreZooKeeperImpl.
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</description>
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</property>
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<property>
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<name>dfs.federation.router.store.driver.zk.async.max.threads</name>
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<value>-1</value>
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<description>
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Max threads number of StateStoreZooKeeperImpl in async mode.
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The only class currently being supported:
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org.apache.hadoop.hdfs.server.federation.store.driver.impl.StateStoreZooKeeperImpl.
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Default value is -1, which means StateStoreZooKeeperImpl is working in sync mode.
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Use positive integer value to enable async mode.
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</description>
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</property>
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<property>
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<name>dfs.federation.router.cache.ttl</name>
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<value>1m</value>
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<description>
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How often to refresh the State Store caches in milliseconds. This setting
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supports multiple time unit suffixes as described in
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dfs.heartbeat.interval. If no suffix is specified then milliseconds is
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assumed.
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</description>
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</property>
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<property>
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<name>dfs.federation.router.store.membership.expiration</name>
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<value>300000</value>
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<description>
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Expiration time in milliseconds for a membership record.
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</description>
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</property>
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<property>
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<name>dfs.federation.router.store.membership.expiration.deletion</name>
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<value>-1</value>
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<description>
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Deletion time in milliseconds for a membership record. If an expired
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membership record exists beyond this time, it will be deleted. If this
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value is negative, the deletion is disabled.
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</description>
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</property>
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<property>
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<name>dfs.federation.router.heartbeat.enable</name>
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<value>true</value>
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<description>
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If true, the Router heartbeats into the State Store.
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</description>
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</property>
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<property>
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<name>dfs.federation.router.heartbeat.interval</name>
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<value>5000</value>
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<description>
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How often the Router should heartbeat into the State Store in milliseconds.
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</description>
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</property>
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<property>
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<name>dfs.federation.router.health.monitor.timeout</name>
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<value>30s</value>
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<description>
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Time out for Router to obtain HAServiceStatus from NameNode.
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</description>
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</property>
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<property>
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<name>dfs.federation.router.heartbeat-state.interval</name>
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<value>5s</value>
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<description>
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How often the Router should heartbeat its state into the State Store in
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milliseconds. This setting supports multiple time unit suffixes as
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described in dfs.federation.router.quota-cache.update.interval.
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</description>
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</property>
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<property>
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<name>dfs.federation.router.namenode.heartbeat.enable</name>
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<value></value>
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<description>
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If true, get namenode heartbeats and send into the State Store.
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If not explicitly specified takes the same value as for
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dfs.federation.router.heartbeat.enable.
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</description>
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</property>
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<property>
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<name>dfs.federation.router.store.router.expiration</name>
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<value>5m</value>
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<description>
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Expiration time in milliseconds for a router state record. This setting
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supports multiple time unit suffixes as described in
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dfs.federation.router.quota-cache.update.interval.
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</description>
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</property>
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<property>
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<name>dfs.federation.router.store.router.expiration.deletion</name>
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<value>-1</value>
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<description>
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Deletion time in milliseconds for a router state record. If an expired
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router state record exists beyond this time, it will be deleted. If this
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value is negative, the deletion is disabled.
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</description>
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</property>
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<property>
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<name>dfs.federation.router.safemode.enable</name>
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<value>true</value>
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<description>
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</description>
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</property>
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<property>
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<name>dfs.federation.router.safemode.extension</name>
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<value>30s</value>
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<description>
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Time after startup that the Router is in safe mode. This setting
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supports multiple time unit suffixes as described in
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dfs.heartbeat.interval. If no suffix is specified then milliseconds is
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assumed.
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</description>
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</property>
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<property>
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<name>dfs.federation.router.safemode.expiration</name>
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<value>3m</value>
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<description>
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Time without being able to reach the State Store to enter safe mode. This
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setting supports multiple time unit suffixes as described in
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dfs.heartbeat.interval. If no suffix is specified then milliseconds is
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assumed.
|
|
</description>
|
|
</property>
|
|
|
|
<property>
|
|
<name>dfs.federation.router.monitor.namenode</name>
|
|
<value></value>
|
|
<description>
|
|
The identifier of the namenodes to monitor and heartbeat.
|
|
</description>
|
|
</property>
|
|
|
|
<property>
|
|
<name>dfs.federation.router.monitor.namenode.nameservice.resolution-enabled</name>
|
|
<value>false</value>
|
|
<description>
|
|
Determines if the given monitored namenode address is a domain name which needs to
|
|
be resolved.
|
|
This is used by router to resolve namenodes.
|
|
</description>
|
|
</property>
|
|
|
|
<property>
|
|
<name>dfs.federation.router.monitor.namenode.nameservice.resolver.impl</name>
|
|
<value></value>
|
|
<description>
|
|
Nameservice resolver implementation used by router.
|
|
Effective with
|
|
dfs.federation.router.monitor.namenode.nameservices.resolution-enabled on.
|
|
</description>
|
|
</property>
|
|
|
|
<property>
|
|
<name>dfs.federation.router.monitor.localnamenode.enable</name>
|
|
<value>true</value>
|
|
<description>
|
|
If true, the Router should monitor the namenode in the local machine.
|
|
</description>
|
|
</property>
|
|
|
|
<property>
|
|
<name>dfs.federation.router.mount-table.max-cache-size</name>
|
|
<value>10000</value>
|
|
<description>
|
|
Maximum number of mount table cache entries to have.
|
|
By default, remove cache entries if we have more than 10k.
|
|
</description>
|
|
</property>
|
|
|
|
<property>
|
|
<name>dfs.federation.router.mount-table.cache.enable</name>
|
|
<value>true</value>
|
|
<description>
|
|
Set to true to enable mount table cache (Path to Remote Location cache).
|
|
Disabling the cache is recommended when a large amount of unique paths are queried.
|
|
</description>
|
|
</property>
|
|
|
|
<property>
|
|
<name>dfs.federation.router.quota.enable</name>
|
|
<value>false</value>
|
|
<description>
|
|
Set to true to enable quota system in Router. When it's enabled, setting
|
|
or clearing sub-cluster's quota directly is not recommended since Router
|
|
Admin server will override sub-cluster's quota with global quota.
|
|
</description>
|
|
</property>
|
|
|
|
<property>
|
|
<name>dfs.federation.router.quota-cache.update.interval</name>
|
|
<value>60s</value>
|
|
<description>
|
|
Interval time for updating quota usage cache in Router.
|
|
This property is used only if the value of
|
|
dfs.federation.router.quota.enable is true.
|
|
This setting supports multiple time unit suffixes as described
|
|
in dfs.heartbeat.interval. If no suffix is specified then milliseconds
|
|
is assumed.
|
|
</description>
|
|
</property>
|
|
|
|
<property>
|
|
<name>dfs.federation.router.client.thread-size</name>
|
|
<value>32</value>
|
|
<description>
|
|
Max threads size for the RouterClient to execute concurrent
|
|
requests.
|
|
</description>
|
|
</property>
|
|
|
|
<property>
|
|
<name>dfs.federation.router.client.retry.max.attempts</name>
|
|
<value>3</value>
|
|
<description>
|
|
Max retry attempts for the RouterClient talking to the Router.
|
|
</description>
|
|
</property>
|
|
|
|
<property>
|
|
<name>dfs.federation.router.client.reject.overload</name>
|
|
<value>false</value>
|
|
<description>
|
|
Set to true to reject client requests when we run out of RPC client
|
|
threads.
|
|
</description>
|
|
</property>
|
|
|
|
<property>
|
|
<name>dfs.federation.router.client.allow-partial-listing</name>
|
|
<value>true</value>
|
|
<description>
|
|
If the Router can return a partial list of files in a multi-destination mount point when one of the subclusters is unavailable.
|
|
True may return a partial list of files if a subcluster is down.
|
|
False will fail the request if one is unavailable.
|
|
</description>
|
|
</property>
|
|
|
|
<property>
|
|
<name>dfs.federation.router.client.mount-status.time-out</name>
|
|
<value>1s</value>
|
|
<description>
|
|
Set a timeout for the Router when listing folders containing mount
|
|
points. In this process, the Router checks the mount table and then it
|
|
checks permissions in the subcluster. After the time out, we return the
|
|
default values.
|
|
</description>
|
|
</property>
|
|
|
|
<property>
|
|
<name>dfs.federation.router.connect.max.retries.on.timeouts</name>
|
|
<value>0</value>
|
|
<description>
|
|
Maximum number of retries for the IPC Client when connecting to the
|
|
subclusters. By default, it doesn't let the IPC retry and the Router
|
|
handles it.
|
|
</description>
|
|
</property>
|
|
|
|
<property>
|
|
<name>dfs.federation.router.connect.timeout</name>
|
|
<value>2s</value>
|
|
<description>
|
|
Time out for the IPC client connecting to the subclusters. This should be
|
|
short as the Router has knowledge of the state of the Routers.
|
|
</description>
|
|
</property>
|
|
|
|
<property>
|
|
<name>dfs.federation.router.keytab.file</name>
|
|
<value></value>
|
|
<description>
|
|
The keytab file used by router to login as its
|
|
service principal. The principal name is configured with
|
|
dfs.federation.router.kerberos.principal.
|
|
</description>
|
|
</property>
|
|
|
|
<property>
|
|
<name>dfs.federation.router.kerberos.principal</name>
|
|
<value></value>
|
|
<description>
|
|
The Router service principal. This is typically set to
|
|
router/_HOST@REALM.TLD. Each Router will substitute _HOST with its
|
|
own fully qualified hostname at startup. The _HOST placeholder
|
|
allows using the same configuration setting on both Router
|
|
in an HA setup.
|
|
</description>
|
|
</property>
|
|
|
|
<property>
|
|
<name>dfs.federation.router.kerberos.principal.hostname</name>
|
|
<value></value>
|
|
<description>
|
|
Optional. The hostname for the Router containing this
|
|
configuration file. Will be different for each machine.
|
|
Defaults to current hostname.
|
|
</description>
|
|
</property>
|
|
|
|
<property>
|
|
<name>dfs.federation.router.kerberos.internal.spnego.principal</name>
|
|
<value>${dfs.web.authentication.kerberos.principal}</value>
|
|
<description>
|
|
The server principal used by the Router for web UI SPNEGO
|
|
authentication when Kerberos security is enabled. This is
|
|
typically set to HTTP/_HOST@REALM.TLD The SPNEGO server principal
|
|
begins with the prefix HTTP/ by convention.
|
|
|
|
If the value is '*', the web server will attempt to login with
|
|
every principal specified in the keytab file
|
|
dfs.web.authentication.kerberos.keytab.
|
|
</description>
|
|
</property>
|
|
|
|
<property>
|
|
<name>dfs.federation.router.mount-table.cache.update</name>
|
|
<value>false</value>
|
|
<description>Set true to enable MountTableRefreshService. This service
|
|
updates mount table cache immediately after adding, modifying or
|
|
deleting the mount table entries. If this service is not enabled
|
|
mount table cache are refreshed periodically by
|
|
StateStoreCacheUpdateService
|
|
</description>
|
|
</property>
|
|
|
|
<property>
|
|
<name>dfs.federation.router.mount-table.cache.update.timeout</name>
|
|
<value>1m</value>
|
|
<description>This property defines how long to wait for all the
|
|
admin servers to finish their mount table cache update. This setting
|
|
supports multiple time unit suffixes as described in
|
|
dfs.federation.router.safemode.extension.
|
|
</description>
|
|
</property>
|
|
|
|
<property>
|
|
<name>dfs.federation.router.mount-table.cache.update.client.max.time
|
|
</name>
|
|
<value>5m</value>
|
|
<description>Remote router mount table cache is updated through
|
|
RouterClient(RPC call). To improve performance, RouterClient
|
|
connections are cached but it should not be kept in cache forever.
|
|
This property defines the max time a connection can be cached. This
|
|
setting supports multiple time unit suffixes as described in
|
|
dfs.federation.router.safemode.extension.
|
|
</description>
|
|
</property>
|
|
|
|
<property>
|
|
<name>dfs.federation.router.secret.manager.class</name>
|
|
<value>org.apache.hadoop.hdfs.server.federation.router.security.token.ZKDelegationTokenSecretManagerImpl</value>
|
|
<description>
|
|
Class to implement state store to delegation tokens.
|
|
Default implementation uses zookeeper as the backend to store delegation tokens.
|
|
</description>
|
|
</property>
|
|
|
|
<property>
|
|
<name>dfs.federation.router.top.num.token.realowners</name>
|
|
<value>10</value>
|
|
<description>
|
|
The number of top real owners by tokens count to report in the JMX metrics.
|
|
Real owners are the effective users whose cretential are used to generate
|
|
the tokens.
|
|
</description>
|
|
</property>
|
|
|
|
<property>
|
|
<name>dfs.federation.router.fairness.policy.controller.class</name>
|
|
<value>org.apache.hadoop.hdfs.server.federation.fairness.NoRouterRpcFairnessPolicyController</value>
|
|
<description>
|
|
No fairness policy handler by default, for fairness
|
|
StaticFairnessPolicyController should be configured.
|
|
</description>
|
|
</property>
|
|
|
|
<property>
|
|
<name>dfs.federation.router.fairness.handler.count.EXAMPLENAMESERVICE</name>
|
|
<value></value>
|
|
<description>
|
|
Dedicated handler count for nameservice EXAMPLENAMESERVICE. The handler
|
|
(configed by dfs.federation.router.handler.count)resource is controlled
|
|
internally by Semaphore permits. Two requirements have to be satisfied.
|
|
1) all downstream nameservices need this config otherwise no permit will
|
|
be given thus not proxy will happen. 2) if a special *concurrent*
|
|
nameservice is specified, the sum of all configured values is smaller or
|
|
equal to the total number of router handlers; if the special *concurrent*
|
|
is not specified, the sum of all configured values must be strictly
|
|
smaller than the router handlers thus the left will be allocated to the
|
|
concurrent calls.
|
|
</description>
|
|
</property>
|
|
|
|
<property>
|
|
<name>dfs.federation.router.fairness.acquire.timeout</name>
|
|
<value>1s</value>
|
|
<description>
|
|
The maximum time to wait for a permit.
|
|
</description>
|
|
</property>
|
|
|
|
<property>
|
|
<name>dfs.federation.router.federation.rename.bandwidth</name>
|
|
<value>10</value>
|
|
<description>
|
|
Specify bandwidth per map in MB.
|
|
</description>
|
|
</property>
|
|
|
|
<property>
|
|
<name>dfs.federation.router.federation.rename.map</name>
|
|
<value>10</value>
|
|
<description>
|
|
Max number of concurrent maps to use for copy.
|
|
</description>
|
|
</property>
|
|
|
|
<property>
|
|
<name>dfs.federation.router.federation.rename.delay</name>
|
|
<value>1000</value>
|
|
<description>
|
|
Specify the delayed duration(millie seconds) when the job needs to retry.
|
|
</description>
|
|
</property>
|
|
|
|
<property>
|
|
<name>dfs.federation.router.federation.rename.diff</name>
|
|
<value>0</value>
|
|
<description>
|
|
Specify the threshold of the diff entries that used in incremental copy
|
|
stage.
|
|
</description>
|
|
</property>
|
|
|
|
<property>
|
|
<name>dfs.federation.router.federation.rename.option</name>
|
|
<value>NONE</value>
|
|
<description>
|
|
Specify the action when rename across namespaces. The option can be NONE
|
|
and DISTCP.
|
|
</description>
|
|
</property>
|
|
|
|
<property>
|
|
<name>dfs.federation.router.federation.rename.force.close.open.file</name>
|
|
<value>true</value>
|
|
<description>
|
|
Force close all open files when there is no diff in the DIFF_DISTCP stage.
|
|
</description>
|
|
</property>
|
|
|
|
<property>
|
|
<name>dfs.federation.router.federation.rename.trash</name>
|
|
<value>trash</value>
|
|
<description>
|
|
This options has 3 values: trash (move the source path to trash), delete
|
|
(delete the source path directly) and skip (skip both trash and deletion).
|
|
</description>
|
|
</property>
|
|
|
|
<property>
|
|
<name>dfs.federation.router.observer.read.default</name>
|
|
<value>false</value>
|
|
<description>
|
|
Whether observer reads are enabled. This is a default for all nameservices.
|
|
The default can be inverted for individual namespace by adding them to
|
|
dfs.federation.router.observer.read.overrides.
|
|
</description>
|
|
</property>
|
|
|
|
<property>
|
|
<name>dfs.federation.router.observer.read.overrides</name>
|
|
<value/>
|
|
<description>
|
|
Commas separated list of namespaces for which to invert the default configuration,
|
|
dfs.federation.router.observer.read.default, for whether to enable observer reads.
|
|
</description>
|
|
</property>
|
|
|
|
<property>
|
|
<name>dfs.federation.router.observer.federated.state.propagation.maxsize</name>
|
|
<value>5</value>
|
|
<description>
|
|
The maximum size of the federated state to send in the RPC header. Sending the federated
|
|
state removes the need to msync on every read call, but at the expense of having a larger
|
|
header. The cost tradeoff between the larger header and always msync'ing depends on the number
|
|
of namespaces in use and the latency of the msync requests.
|
|
</description>
|
|
</property>
|
|
|
|
<property>
|
|
<name>dfs.federation.router.observer.state.id.refresh.period</name>
|
|
<value>15s</value>
|
|
<description>
|
|
Period to refresh namespace stateID using active namenode. This ensures the
|
|
namespace stateID is refresh even when an observer is trailing behind.
|
|
If this is below 0, the auto-refresh is disabled.
|
|
</description>
|
|
</property>
|
|
</configuration>
|