HDFS-14959: [SBNN read] access time should be turned off (#1706) Contributed by Chao Sun.
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@ -194,6 +194,21 @@ few configurations to your **hdfs-site.xml**:
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<value>1048576</value>
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</property>
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* **dfs.namenode.accesstime.precision** -- whether to enable access
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time for HDFS file.
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It is **highly recommended** to disable this configuration. If
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enabled, this will turn a `getBlockLocations` call into a write call,
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as it needs to hold write lock to update the time for the opened
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file. Therefore, the request will fail on all Observer NameNodes and fall
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back to the active eventually. As result, RPC performance will degrade.
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<property>
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<name>dfs.namenode.accesstime.precision</name>
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<value>0</value>
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</property>
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### New administrative command
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A new HA admin command is introduced to transition a Standby NameNode
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