HDFS-5467. Remove tab characters in hdfs-default.xml. Contributed by Shinichi Yamashita.
git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1540816 13f79535-47bb-0310-9956-ffa450edef68
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@ -465,6 +465,9 @@ Release 2.3.0 - UNRELEASED
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HDFS-5371. Let client retry the same NN when
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"dfs.client.test.drop.namenode.response.number" is enabled. (jing9)
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HDFS-5467. Remove tab characters in hdfs-default.xml.
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(Shinichi Yamashita via Andrew Wang)
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OPTIMIZATIONS
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HDFS-5239. Allow FSNamesystem lock fairness to be configurable (daryn)
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@ -1393,43 +1393,43 @@
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</property>
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<property>
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<name>dfs.namenode.enable.retrycache</name>
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<value>true</value>
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<description>
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This enables the retry cache on the namenode. Namenode tracks for
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non-idempotent requests the corresponding response. If a client retries the
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request, the response from the retry cache is sent. Such operations
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are tagged with annotation @AtMostOnce in namenode protocols. It is
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recommended that this flag be set to true. Setting it to false, will result
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in clients getting failure responses to retried request. This flag must
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be enabled in HA setup for transparent fail-overs.
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The entries in the cache have expiration time configurable
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using dfs.namenode.retrycache.expirytime.millis.
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</description>
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<name>dfs.namenode.enable.retrycache</name>
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<value>true</value>
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<description>
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This enables the retry cache on the namenode. Namenode tracks for
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non-idempotent requests the corresponding response. If a client retries the
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request, the response from the retry cache is sent. Such operations
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are tagged with annotation @AtMostOnce in namenode protocols. It is
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recommended that this flag be set to true. Setting it to false, will result
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in clients getting failure responses to retried request. This flag must
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be enabled in HA setup for transparent fail-overs.
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The entries in the cache have expiration time configurable
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using dfs.namenode.retrycache.expirytime.millis.
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</description>
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</property>
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<property>
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<name>dfs.namenode.retrycache.expirytime.millis</name>
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<value>600000</value>
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<description>
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The time for which retry cache entries are retained.
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</description>
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<name>dfs.namenode.retrycache.expirytime.millis</name>
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<value>600000</value>
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<description>
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The time for which retry cache entries are retained.
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</description>
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</property>
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<property>
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<name>dfs.namenode.retrycache.heap.percent</name>
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<value>0.03f</value>
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<description>
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This parameter configures the heap size allocated for retry cache
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(excluding the response cached). This corresponds to approximately
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4096 entries for every 64MB of namenode process java heap size.
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Assuming retry cache entry expiration time (configured using
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dfs.namenode.retrycache.expirytime.millis) of 10 minutes, this
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enables retry cache to support 7 operations per second sustained
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for 10 minutes. As the heap size is increased, the operation rate
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linearly increases.
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</description>
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<name>dfs.namenode.retrycache.heap.percent</name>
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<value>0.03f</value>
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<description>
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This parameter configures the heap size allocated for retry cache
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(excluding the response cached). This corresponds to approximately
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4096 entries for every 64MB of namenode process java heap size.
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Assuming retry cache entry expiration time (configured using
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dfs.namenode.retrycache.expirytime.millis) of 10 minutes, this
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enables retry cache to support 7 operations per second sustained
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for 10 minutes. As the heap size is increased, the operation rate
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linearly increases.
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</description>
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</property>
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<property>
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