Tianyin Xu created HDFS-9578:
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Summary: 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
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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