最近在测试hadoop+fluentd方案，但是fluentd日志收集系统，需要append功能选择，写日志到HDFS中，官方给出的解决方案是：
修改hdfs-site.xml 文件,增加如下行：
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<property>
<name>dfs.webhdfs.enabled<
/name
>
<value>
true
<
/value
>
<
/property
>
<property>
<name>dfs.support.append<
/name
>
<value>
true
<
/value
>
<
/property
>
<property>
<name>dfs.support.broken.append<
/name
>
<value>
true
<
/value
>
<
/property
>
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但是format namenode节点的时候会报错：
[hadoop@node1 ~]$ hadoop namenode -format
14/12/25 10:35:25 INFO namenode.NameNode: STARTUP_MSG:
/************************************************************
STARTUP_MSG: Starting NameNode
STARTUP_MSG: host = node1.test.com/172.16.41.151
STARTUP_MSG: args = [-format]
STARTUP_MSG: version = 1.2.1
STARTUP_MSG: build = https://svn.apache.org/repos/asf/hadoop/common/branches/branch-1.2 -r 1503152; compiled by 'mattf' on Mon Jul 22 15:23:09 PDT 2013
STARTUP_MSG: java = 1.7.0_67
************************************************************/
14/12/25 10:35:25 INFO util.GSet: Computing capacity for map BlocksMap
14/12/25 10:35:25 INFO util.GSet: VM type = 64-bit
14/12/25 10:35:25 INFO util.GSet: 2.0% max memory = 932184064
14/12/25 10:35:25 INFO util.GSet: capacity = 2^21 = 2097152 entries
14/12/25 10:35:25 INFO util.GSet: recommended=2097152, actual=2097152
14/12/25 10:35:26 INFO namenode.FSNamesystem: fsOwner=hadoop
14/12/25 10:35:26 INFO namenode.FSNamesystem: supergroup=supergroup
14/12/25 10:35:26 INFO namenode.FSNamesystem: isPermissionEnabled=true
14/12/25 10:35:26 INFO namenode.FSNamesystem: dfs.block.invalidate.limit=100
14/12/25 10:35:26 WARN namenode.FSNamesystem: The dfs.support.append option is in your configuration, however append is not supported. This configuration option is no longer required to enable sync
14/12/25 10:35:26 INFO namenode.FSNamesystem: isAccessTokenEnabled=false accessKeyUpdateInterval=0 min(s), accessTokenLifetime=0 min(s)
14/12/25 10:35:26 INFO namenode.FSEditLog: dfs.namenode.edits.toleration.length = 0
14/12/25 10:35:26 INFO namenode.NameNode: Caching file names occuring more than 10 times
14/12/25 10:35:26 INFO common.Storage: Image file /usr/local/hadoop_tmp/dfs/name/current/fsimage of size 112 bytes saved in 0 seconds.
14/12/25 10:35:26 INFO namenode.FSEditLog: closing edit log: position=4, editlog=/usr/local/hadoop_tmp/dfs/name/current/edits
14/12/25 10:35:26 INFO namenode.FSEditLog: close success: truncate to 4, editlog=/usr/local/hadoop_tmp/dfs/name/current/edits
14/12/25 10:35:26 INFO common.Storage: Storage directory /usr/local/hadoop_tmp/dfs/name has been successfully formatted.
网上搜索半天，最好解决办法如下：
用一下语句：
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<property>
<name>dfs.support.broken.append<
/name
>
<value>
true
<
/value
>
<
/property
>
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然后再次格式化namenode，就不报错了！
[hadoop@node1 conf]$ hadoop namenode -format
14/12/25 10:47:18 INFO namenode.NameNode: STARTUP_MSG:
/************************************************************
STARTUP_MSG: Starting NameNode
STARTUP_MSG: host = node1.test.com/172.16.41.151
STARTUP_MSG: args = [-format]
STARTUP_MSG: version = 1.2.1
STARTUP_MSG: build = https://svn.apache.org/repos/asf/hadoop/common/branches/branch-1.2 -r 1503152; compiled by 'mattf' on Mon Jul 22 15:23:09 PDT 2013
STARTUP_MSG: java = 1.7.0_67
************************************************************/
Re-format filesystem in /usr/local/hadoop_tmp/dfs/name ? (Y or N) Y
14/12/25 10:47:21 INFO util.GSet: Computing capacity for map BlocksMap
14/12/25 10:47:21 INFO util.GSet: VM type = 64-bit
14/12/25 10:47:21 INFO util.GSet: 2.0% max memory = 932184064
14/12/25 10:47:21 INFO util.GSet: capacity = 2^21 = 2097152 entries
14/12/25 10:47:21 INFO util.GSet: recommended=2097152, actual=2097152
14/12/25 10:47:21 INFO namenode.FSNamesystem: fsOwner=hadoop
14/12/25 10:47:21 INFO namenode.FSNamesystem: supergroup=supergroup
14/12/25 10:47:21 INFO namenode.FSNamesystem: isPermissionEnabled=true
14/12/25 10:47:21 INFO namenode.FSNamesystem: dfs.block.invalidate.limit=100
14/12/25 10:47:21 INFO namenode.FSNamesystem: isAccessTokenEnabled=false accessKeyUpdateInterval=0 min(s), accessTokenLifetime=0 min(s)
14/12/25 10:47:21 INFO namenode.FSEditLog: dfs.namenode.edits.toleration.length = 0
14/12/25 10:47:21 INFO namenode.NameNode: Caching file names occuring more than 10 times
14/12/25 10:47:21 INFO common.Storage: Image file /usr/local/hadoop_tmp/dfs/name/current/fsimage of size 112 bytes saved in 0 seconds.
14/12/25 10:47:21 INFO namenode.FSEditLog: closing edit log: position=4, editlog=/usr/local/hadoop_tmp/dfs/name/current/edits
14/12/25 10:47:21 INFO namenode.FSEditLog: close success: truncate to 4, editlog=/usr/local/hadoop_tmp/dfs/name/current/edits
14/12/25 10:47:21 INFO common.Storage: Storage directory /usr/local/hadoop_tmp/dfs/name has been successfully formatted.
14/12/25 10:47:21 INFO namenode.NameNode: SHUTDOWN_MSG:
/************************************************************
SHUTDOWN_MSG: Shutting down NameNode at node1.test.com/172.16.41.151
************************************************************/
