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From "Zhe Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-9578) Incorrect default value (typo) in hdfs-default.xml
Date Sat, 19 Dec 2015 00:55:46 GMT

    [ https://issues.apache.org/jira/browse/HDFS-9578?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15065093#comment-15065093
] 

Zhe Zhang commented on HDFS-9578:
---------------------------------

Correct.

> Incorrect default value (typo) in hdfs-default.xml
> --------------------------------------------------
>
>                 Key: HDFS-9578
>                 URL: https://issues.apache.org/jira/browse/HDFS-9578
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: documentation
>    Affects Versions: 2.6.2, 2.6.3
>            Reporter: Tianyin Xu
>            Assignee: Xiaobing Zhou
>            Priority: Minor
>
> In {{hdfs-default.xml}}, the default value of {{dfs.datanode.readahead.bytes}} is wrong.

> The value should be 4MB (4 * 1024 * 1024) according to the code, i.e.,
> {{4194304}}, 
> while in hdfs-default.xml, it is 
> {{4193404}}.
> ----------------------------
> (src)
> {code:title=DFSConfigKeys.java|borderStyle=solid}
> 134   public static final String  DFS_DATANODE_READAHEAD_BYTES_KEY = "dfs.datanode.readahead.bytes";
> 135   public static final long    DFS_DATANODE_READAHEAD_BYTES_DEFAULT = 4 * 1024 * 1024;
// 4MB
> {code}
> (hdfs-default.xml)
> https://hadoop.apache.org/docs/r2.6.2/hadoop-project-dist/hadoop-hdfs/hdfs-default.xml



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