Tianyin Xu created HDFS-9581:
--------------------------------
Summary: The default value of BackupNode should be "0.0.0.0"
instead of "localhost"
Key: HDFS-9581
URL: https://issues.apache.org/jira/browse/HDFS-9581
Project: Hadoop HDFS
Issue Type: Bug
Components: namenode
Affects Versions: 2.7.1, 2.6.3
Reporter: Tianyin Xu
The current default value of config parameter,{{dfs.namenode.backup.address}},
is
{{localhost:50100}}
while in the docs (hdfs-default.xml), it is
{{0.0.0.0:50100}}
We should make the values consistent, as {{localhost}} has very different
meanings from {{0.0.0.0}}. Since all the server daemons (e.g.,
{{dfs.namenode.backup.http-address}}, {{dfs.datanode.address}}) bind to
{{0.0.0.0}}. I guess {{dfs.namenode.backup.address}} should also be
{{0.0.0.0}}, unless there are some protection concerns (in this case we can
change hdfs-default.xml).
*Patch (DFSConfigKeys.java)*
{code}
--- DFSConfigKeys.java 2015-12-19 10:39:38.982212865 -0800
+++ DFSConfigKeys.java 2015-12-19 10:40:10.830213622 -0800
@@ -132,7 +132,7 @@
public static final String DFS_DATANODE_RESTART_REPLICA_EXPIRY_KEY =
"dfs.datanode.restart.replica.expiration";
public static final long DFS_DATANODE_RESTART_REPLICA_EXPIRY_DEFAULT = 50;
public static final String DFS_NAMENODE_BACKUP_ADDRESS_KEY =
"dfs.namenode.backup.address";
- public static final String DFS_NAMENODE_BACKUP_ADDRESS_DEFAULT =
"localhost:50100";
+ public static final String DFS_NAMENODE_BACKUP_ADDRESS_DEFAULT =
"0.0.0.0:50100";
public static final String DFS_NAMENODE_BACKUP_HTTP_ADDRESS_KEY =
"dfs.namenode.backup.http-address";
public static final String DFS_NAMENODE_BACKUP_HTTP_ADDRESS_DEFAULT =
"0.0.0.0:50105";
public static final String DFS_NAMENODE_BACKUP_SERVICE_RPC_ADDRESS_KEY =
"dfs.namenode.backup.dnrpc-address";
{code}
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