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Posted to hdfs-dev@hadoop.apache.org by "BELUGA BEHR (JIRA)" <ji...@apache.org> on 2018/08/09 13:52:00 UTC

[jira] [Created] (HDFS-13812) Update Docs on Caching

BELUGA BEHR created HDFS-13812:
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             Summary: Update Docs on Caching
                 Key: HDFS-13812
                 URL: https://issues.apache.org/jira/browse/HDFS-13812
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: documentation
    Affects Versions: 2.9.1
            Reporter: BELUGA BEHR


{quote}
dfs.namenode.path.based.cache.refresh.interval.ms

The NameNode will use this as the amount of milliseconds between subsequent path cache rescans. This calculates the blocks to cache and each DataNode containing a replica of the block that should cache it.

By default, this parameter is set to 300000, which is five minutes.
{quote}

[https://hadoop.apache.org/docs/current/hadoop-project-dist/hadoop-hdfs/CentralizedCacheManagement.html]

However, this default value was change in [HDFS-6106] to 30 seconds.  Please update docs.



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