[HDFS-9578] Incorrect default value (typo) in hdfs-default.xml

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Duplicate
• Affects Version/s: 2.6.2, 2.6.3
• Component/s: documentation
• Assignee: Xiaobing Zhou
• Reporter: Tianyin Xu
• Created: 18/Dec/15 21:25
• Updated: 19/Dec/15 01:08
• Resolved: 19/Dec/15 00:13

Description

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)

DFSConfigKeys.java

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

(hdfs-default.xml)
https://hadoop.apache.org/docs/r2.6.2/hadoop-project-dist/hadoop-hdfs/hdfs-default.xml

Issue Links

• duplicates: HDFS-8633 Fix setting of dfs.datanode.readahead.bytes in hdfs-default.xml to match DFSConfigKeys