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1<html>
2<body>
3<table border="1">
4<tr>
5<td>name</td><td>value</td><td>description</td>
6</tr>
7<tr>
8<td><a name="dfs.namenode.logging.level">dfs.namenode.logging.level</a></td><td>info</td><td>The logging level for dfs namenode. Other values are "dir"(trac
9e namespace mutations), "block"(trace block under/over replications and block
10creations/deletions), or "all".</td>
11</tr>
12<tr>
13<td><a name="dfs.secondary.http.address">dfs.secondary.http.address</a></td><td>0.0.0.0:50090</td><td>
14    The secondary namenode http server address and port.
15    If the port is 0 then the server will start on a free port.
16  </td>
17</tr>
18<tr>
19<td><a name="dfs.datanode.address">dfs.datanode.address</a></td><td>0.0.0.0:50010</td><td>
20    The address where the datanode server will listen to.
21    If the port is 0 then the server will start on a free port.
22  </td>
23</tr>
24<tr>
25<td><a name="dfs.datanode.http.address">dfs.datanode.http.address</a></td><td>0.0.0.0:50075</td><td>
26    The datanode http server address and port.
27    If the port is 0 then the server will start on a free port.
28  </td>
29</tr>
30<tr>
31<td><a name="dfs.datanode.ipc.address">dfs.datanode.ipc.address</a></td><td>0.0.0.0:50020</td><td>
32    The datanode ipc server address and port.
33    If the port is 0 then the server will start on a free port.
34  </td>
35</tr>
36<tr>
37<td><a name="dfs.datanode.handler.count">dfs.datanode.handler.count</a></td><td>3</td><td>The number of server threads for the datanode.</td>
38</tr>
39<tr>
40<td><a name="dfs.http.address">dfs.http.address</a></td><td>0.0.0.0:50070</td><td>
41    The address and the base port where the dfs namenode web ui will listen on.
42    If the port is 0 then the server will start on a free port.
43  </td>
44</tr>
45<tr>
46<td><a name="dfs.https.enable">dfs.https.enable</a></td><td>false</td><td>Decide if HTTPS(SSL) is supported on HDFS
47  </td>
48</tr>
49<tr>
50<td><a name="dfs.https.need.client.auth">dfs.https.need.client.auth</a></td><td>false</td><td>Whether SSL client certificate authentication is required
51  </td>
52</tr>
53<tr>
54<td><a name="dfs.https.server.keystore.resource">dfs.https.server.keystore.resource</a></td><td>ssl-server.xml</td><td>Resource file from which ssl server keystore
55  information will be extracted
56  </td>
57</tr>
58<tr>
59<td><a name="dfs.https.client.keystore.resource">dfs.https.client.keystore.resource</a></td><td>ssl-client.xml</td><td>Resource file from which ssl client keystore
60  information will be extracted
61  </td>
62</tr>
63<tr>
64<td><a name="dfs.datanode.https.address">dfs.datanode.https.address</a></td><td>0.0.0.0:50475</td><td></td>
65</tr>
66<tr>
67<td><a name="dfs.https.address">dfs.https.address</a></td><td>0.0.0.0:50470</td><td></td>
68</tr>
69<tr>
70<td><a name="dfs.datanode.dns.interface">dfs.datanode.dns.interface</a></td><td>default</td><td>The name of the Network Interface from which a data node should
71  report its IP address.
72  </td>
73</tr>
74<tr>
75<td><a name="dfs.datanode.dns.nameserver">dfs.datanode.dns.nameserver</a></td><td>default</td><td>The host name or IP address of the name server (DNS)
76  which a DataNode should use to determine the host name used by the
77  NameNode for communication and display purposes.
78  </td>
79</tr>
80<tr>
81<td><a name="dfs.replication.considerLoad">dfs.replication.considerLoad</a></td><td>true</td><td>Decide if chooseTarget considers the target's load or not
82  </td>
83</tr>
84<tr>
85<td><a name="dfs.default.chunk.view.size">dfs.default.chunk.view.size</a></td><td>32768</td><td>The number of bytes to view for a file on the browser.
86  </td>
87</tr>
88<tr>
89<td><a name="dfs.datanode.du.reserved">dfs.datanode.du.reserved</a></td><td>0</td><td>Reserved space in bytes per volume. Always leave this much space free for non dfs use.
90  </td>
91</tr>
92<tr>
93<td><a name="dfs.name.dir">dfs.name.dir</a></td><td>${hadoop.tmp.dir}/dfs/name</td><td>Determines where on the local filesystem the DFS name node
94      should store the name table(fsimage).  If this is a comma-delimited list
95      of directories then the name table is replicated in all of the
96      directories, for redundancy. </td>
97</tr>
98<tr>
99<td><a name="dfs.name.edits.dir">dfs.name.edits.dir</a></td><td>${dfs.name.dir}</td><td>Determines where on the local filesystem the DFS name node
100      should store the transaction (edits) file. If this is a comma-delimited list
101      of directories then the transaction file is replicated in all of the
102      directories, for redundancy. Default value is same as dfs.name.dir
103  </td>
104</tr>
105<tr>
106<td><a name="dfs.web.ugi">dfs.web.ugi</a></td><td>webuser,webgroup</td><td>The user account used by the web interface.
107    Syntax: USERNAME,GROUP1,GROUP2, ...
108  </td>
109</tr>
110<tr>
111<td><a name="dfs.permissions">dfs.permissions</a></td><td>true</td><td>
112    If "true", enable permission checking in HDFS.
113    If "false", permission checking is turned off,
114    but all other behavior is unchanged.
115    Switching from one parameter value to the other does not change the mode,
116    owner or group of files or directories.
117  </td>
118</tr>
119<tr>
120<td><a name="dfs.permissions.supergroup">dfs.permissions.supergroup</a></td><td>supergroup</td><td>The name of the group of super-users.</td>
121</tr>
122<tr>
123<td><a name="dfs.data.dir">dfs.data.dir</a></td><td>${hadoop.tmp.dir}/dfs/data</td><td>Determines where on the local filesystem an DFS data node
124  should store its blocks.  If this is a comma-delimited
125  list of directories, then data will be stored in all named
126  directories, typically on different devices.
127  Directories that do not exist are ignored.
128  </td>
129</tr>
130<tr>
131<td><a name="dfs.replication">dfs.replication</a></td><td>3</td><td>Default block replication.
132  The actual number of replications can be specified when the file is created.
133  The default is used if replication is not specified in create time.
134  </td>
135</tr>
136<tr>
137<td><a name="dfs.replication.max">dfs.replication.max</a></td><td>512</td><td>Maximal block replication.
138  </td>
139</tr>
140<tr>
141<td><a name="dfs.replication.min">dfs.replication.min</a></td><td>1</td><td>Minimal block replication.
142  </td>
143</tr>
144<tr>
145<td><a name="dfs.block.size">dfs.block.size</a></td><td>67108864</td><td>The default block size for new files.</td>
146</tr>
147<tr>
148<td><a name="dfs.df.interval">dfs.df.interval</a></td><td>60000</td><td>Disk usage statistics refresh interval in msec.</td>
149</tr>
150<tr>
151<td><a name="dfs.client.block.write.retries">dfs.client.block.write.retries</a></td><td>3</td><td>The number of retries for writing blocks to the data nodes,
152  before we signal failure to the application.
153  </td>
154</tr>
155<tr>
156<td><a name="dfs.blockreport.intervalMsec">dfs.blockreport.intervalMsec</a></td><td>3600000</td><td>Determines block reporting interval in milliseconds.</td>
157</tr>
158<tr>
159<td><a name="dfs.blockreport.initialDelay">dfs.blockreport.initialDelay</a></td><td>0</td><td>Delay for first block report in seconds.</td>
160</tr>
161<tr>
162<td><a name="dfs.heartbeat.interval">dfs.heartbeat.interval</a></td><td>3</td><td>Determines datanode heartbeat interval in seconds.</td>
163</tr>
164<tr>
165<td><a name="dfs.namenode.handler.count">dfs.namenode.handler.count</a></td><td>10</td><td>The number of server threads for the namenode.</td>
166</tr>
167<tr>
168<td><a name="dfs.safemode.threshold.pct">dfs.safemode.threshold.pct</a></td><td>0.999f</td><td>
169    Specifies the percentage of blocks that should satisfy
170    the minimal replication requirement defined by dfs.replication.min.
171    Values less than or equal to 0 mean not to start in safe mode.
172    Values greater than 1 will make safe mode permanent.
173  </td>
174</tr>
175<tr>
176<td><a name="dfs.safemode.extension">dfs.safemode.extension</a></td><td>30000</td><td>
177    Determines extension of safe mode in milliseconds
178    after the threshold level is reached.
179  </td>
180</tr>
181<tr>
182<td><a name="dfs.balance.bandwidthPerSec">dfs.balance.bandwidthPerSec</a></td><td>1048576</td><td>
183        Specifies the maximum amount of bandwidth that each datanode
184        can utilize for the balancing purpose in term of
185        the number of bytes per second.
186  </td>
187</tr>
188<tr>
189<td><a name="dfs.hosts">dfs.hosts</a></td><td></td><td>Names a file that contains a list of hosts that are
190  permitted to connect to the namenode. The full pathname of the file
191  must be specified.  If the value is empty, all hosts are
192  permitted.</td>
193</tr>
194<tr>
195<td><a name="dfs.hosts.exclude">dfs.hosts.exclude</a></td><td></td><td>Names a file that contains a list of hosts that are
196  not permitted to connect to the namenode.  The full pathname of the
197  file must be specified.  If the value is empty, no hosts are
198  excluded.</td>
199</tr>
200<tr>
201<td><a name="dfs.max.objects">dfs.max.objects</a></td><td>0</td><td>The maximum number of files, directories and blocks
202  dfs supports. A value of zero indicates no limit to the number
203  of objects that dfs supports.
204  </td>
205</tr>
206<tr>
207<td><a name="dfs.namenode.decommission.interval">dfs.namenode.decommission.interval</a></td><td>30</td><td>Namenode periodicity in seconds to check if decommission is
208  complete.</td>
209</tr>
210<tr>
211<td><a name="dfs.namenode.decommission.nodes.per.interval">dfs.namenode.decommission.nodes.per.interval</a></td><td>5</td><td>The number of nodes namenode checks if decommission is complete
212  in each dfs.namenode.decommission.interval.</td>
213</tr>
214<tr>
215<td><a name="dfs.replication.interval">dfs.replication.interval</a></td><td>3</td><td>The periodicity in seconds with which the namenode computes
216  repliaction work for datanodes. </td>
217</tr>
218<tr>
219<td><a name="dfs.access.time.precision">dfs.access.time.precision</a></td><td>3600000</td><td>The access time for HDFS file is precise upto this value.
220               The default value is 1 hour. Setting a value of 0 disables
221               access times for HDFS.
222  </td>
223</tr>
224<tr>
225<td><a name="dfs.support.append">dfs.support.append</a></td><td>false</td><td>Does HDFS allow appends to files?
226               This is currently set to false because there are bugs in the
227               "append code" and is not supported in any prodction cluster.
228  </td>
229</tr>
230</table>
231</body>
232</html>
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