38af6101d8
git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/HDFS-6584@1611334 13f79535-47bb-0310-9956-ffa450edef68
119 lines
3.8 KiB
XML
119 lines
3.8 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 wish -->
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<!-- to modify from this file into blockStoragePolicy-site.xml and change -->
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<!-- there. If blockStoragePolicy-site.xml does not exist, create it. -->
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<configuration>
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<property>
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<name>dfs.block.storage.policies</name>
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<value>HOT:12, WARM:8, COLD:4</value>
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<description>
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A list of block storage policy names and IDs. The syntax is
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NAME_1:ID_1, NAME_2:ID_2, ..., NAME_n:ID_n
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where ID is an integer in the range [1,15] and NAME is case insensitive.
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The first element is the default policy. Empty list is not allowed.
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</description>
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</property>
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<!-- Block Storage Policy HOT:12 -->
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<property>
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<name>dfs.block.storage.policy.12</name>
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<value>DISK</value>
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<description>
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A list of storage types for storing the block replicas such as
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STORAGE_TYPE_1, STORAGE_TYPE_2, ..., STORAGE_TYPE_n
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When creating a block, the i-th replica is stored using i-th storage type
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for i less than or equal to n, and
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the j-th replica is stored using n-th storage type for j greater than n.
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Empty list is not allowed.
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Examples:
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DISK : all replicas stored using DISK.
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DISK, ARCHIVE : the first replica is stored using DISK and all the
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remaining replicas are stored using ARCHIVE.
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</description>
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</property>
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<property>
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<name>dfs.block.storage.policy.creation-fallback.12</name>
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<value></value>
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<description>
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A list of storage types for creation fallback storage.
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STORAGE_TYPE_1, STORAGE_TYPE_2, ..., STORAGE_TYPE_n
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When creating a block, if a particular storage type specified in the policy
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is unavailable, the fallback STORAGE_TYPE_1 is used. Further, if
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STORAGE_TYPE_i is also unavailable, the fallback STORAGE_TYPE_(i+1) is used.
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In case that all fallback storages are unavailabe, the block will be created
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with number of replicas less than the specified replication factor.
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An empty list indicates that there is no fallback storage.
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</description>
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</property>
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<property>
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<name>dfs.block.storage.policy.replication-fallback.12</name>
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<value>ARCHIVE</value>
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<description>
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Similar to dfs.block.storage.policy.creation-fallback.x but for replication.
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</description>
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</property>
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<!-- Block Storage Policy WARM:8 -->
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<property>
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<name>dfs.block.storage.policy.8</name>
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<value>DISK, ARCHIVE</value>
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</property>
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<property>
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<name>dfs.block.storage.policy.creation-fallback.8</name>
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<value>DISK, ARCHIVE</value>
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</property>
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<property>
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<name>dfs.block.storage.policy.replication-fallback.8</name>
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<value>DISK, ARCHIVE</value>
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</property>
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<!-- Block Storage Policy COLD:4 -->
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<property>
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<name>dfs.block.storage.policy.4</name>
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<value>ARCHIVE</value>
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</property>
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<property>
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<name>dfs.block.storage.policy.creation-fallback.4</name>
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<value></value>
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</property>
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<property>
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<name>dfs.block.storage.policy.replication-fallback.4</name>
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<value></value>
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</property>
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</configuration>
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