001/**
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018
019package org.apache.hadoop.fs;
020
021import org.apache.hadoop.classification.InterfaceAudience;
022
023/** 
024 * This class contains constants for configuration keys used
025 * in the common code.
026 *
027 * It includes all publicly documented configuration keys. In general
028 * this class should not be used directly (use CommonConfigurationKeys
029 * instead)
030 *
031 */
032
033@InterfaceAudience.Public
034public class CommonConfigurationKeysPublic {
035  
036  // The Keys
037  /** See <a href="{@docRoot}/../core-default.html">core-default.xml</a> */
038  public static final String  IO_NATIVE_LIB_AVAILABLE_KEY =
039    "io.native.lib.available";
040  /** Default value for IO_NATIVE_LIB_AVAILABLE_KEY */
041  public static final boolean IO_NATIVE_LIB_AVAILABLE_DEFAULT = true;
042  /** See <a href="{@docRoot}/../core-default.html">core-default.xml</a> */
043  public static final String  NET_TOPOLOGY_SCRIPT_NUMBER_ARGS_KEY =
044    "net.topology.script.number.args";
045  /** Default value for NET_TOPOLOGY_SCRIPT_NUMBER_ARGS_KEY */
046  public static final int     NET_TOPOLOGY_SCRIPT_NUMBER_ARGS_DEFAULT = 100;
047
048  //FS keys
049  /** See <a href="{@docRoot}/../core-default.html">core-default.xml</a> */
050  public static final String  FS_DEFAULT_NAME_KEY = "fs.defaultFS";
051  /** Default value for FS_DEFAULT_NAME_KEY */
052  public static final String  FS_DEFAULT_NAME_DEFAULT = "file:///";
053  /** See <a href="{@docRoot}/../core-default.html">core-default.xml</a> */
054  public static final String  FS_DF_INTERVAL_KEY = "fs.df.interval"; 
055  /** Default value for FS_DF_INTERVAL_KEY */
056  public static final long    FS_DF_INTERVAL_DEFAULT = 60000;
057  /** See <a href="{@docRoot}/../core-default.html">core-default.xml</a> */
058  public static final String  FS_DU_INTERVAL_KEY = "fs.du.interval";
059  /** Default value for FS_DU_INTERVAL_KEY */
060  public static final long    FS_DU_INTERVAL_DEFAULT = 600000;
061  /** See <a href="{@docRoot}/../core-default.html">core-default.xml</a> */
062  public static final String  FS_CLIENT_RESOLVE_REMOTE_SYMLINKS_KEY =
063    "fs.client.resolve.remote.symlinks";
064  /** Default value for FS_CLIENT_RESOLVE_REMOTE_SYMLINKS_KEY */
065  public static final boolean FS_CLIENT_RESOLVE_REMOTE_SYMLINKS_DEFAULT = true;
066
067
068  //Defaults are not specified for following keys
069  /** See <a href="{@docRoot}/../core-default.html">core-default.xml</a> */
070  public static final String  NET_TOPOLOGY_SCRIPT_FILE_NAME_KEY =
071    "net.topology.script.file.name";
072  /** See <a href="{@docRoot}/../core-default.html">core-default.xml</a> */
073  public static final String  NET_TOPOLOGY_NODE_SWITCH_MAPPING_IMPL_KEY =
074    "net.topology.node.switch.mapping.impl";
075  /** See <a href="{@docRoot}/../core-default.html">core-default.xml</a> */
076  public static final String  NET_TOPOLOGY_IMPL_KEY =
077    "net.topology.impl";
078  /** See <a href="{@docRoot}/../core-default.html">core-default.xml</a> */
079  public static final String  NET_TOPOLOGY_TABLE_MAPPING_FILE_KEY =
080    "net.topology.table.file.name";
081  public static final String NET_DEPENDENCY_SCRIPT_FILE_NAME_KEY = 
082    "net.topology.dependency.script.file.name";
083
084  /** See <a href="{@docRoot}/../core-default.html">core-default.xml</a> */
085  public static final String  FS_TRASH_CHECKPOINT_INTERVAL_KEY =
086    "fs.trash.checkpoint.interval";
087  /** Default value for FS_TRASH_CHECKPOINT_INTERVAL_KEY */
088  public static final long    FS_TRASH_CHECKPOINT_INTERVAL_DEFAULT = 0;
089
090  // TBD: Code is still using hardcoded values (e.g. "fs.automatic.close")
091  // instead of constant (e.g. FS_AUTOMATIC_CLOSE_KEY)
092  //
093  /** Not used anywhere, looks like default value for FS_LOCAL_BLOCK_SIZE */
094  public static final long    FS_LOCAL_BLOCK_SIZE_DEFAULT = 32*1024*1024;
095  /** See <a href="{@docRoot}/../core-default.html">core-default.xml</a> */
096  public static final String  FS_AUTOMATIC_CLOSE_KEY = "fs.automatic.close";
097  /** Default value for FS_AUTOMATIC_CLOSE_KEY */
098  public static final boolean FS_AUTOMATIC_CLOSE_DEFAULT = true;
099  /** See <a href="{@docRoot}/../core-default.html">core-default.xml</a> */
100  public static final String  FS_FILE_IMPL_KEY = "fs.file.impl";
101  /** See <a href="{@docRoot}/../core-default.html">core-default.xml</a> */
102  public static final String  FS_FTP_HOST_KEY = "fs.ftp.host";
103  /** See <a href="{@docRoot}/../core-default.html">core-default.xml</a> */
104  public static final String  FS_FTP_HOST_PORT_KEY = "fs.ftp.host.port";
105  /** See <a href="{@docRoot}/../core-default.html">core-default.xml</a> */
106  public static final String  FS_TRASH_INTERVAL_KEY = "fs.trash.interval";
107  /** Default value for FS_TRASH_INTERVAL_KEY */
108  public static final long    FS_TRASH_INTERVAL_DEFAULT = 0;
109
110  /** See <a href="{@docRoot}/../core-default.html">core-default.xml</a> */
111  public static final String  IO_MAPFILE_BLOOM_SIZE_KEY =
112    "io.mapfile.bloom.size";
113  /** Default value for IO_MAPFILE_BLOOM_SIZE_KEY */
114  public static final int     IO_MAPFILE_BLOOM_SIZE_DEFAULT = 1024*1024;
115  /** See <a href="{@docRoot}/../core-default.html">core-default.xml</a> */
116  public static final String  IO_MAPFILE_BLOOM_ERROR_RATE_KEY =
117    "io.mapfile.bloom.error.rate" ;
118  /** Default value for IO_MAPFILE_BLOOM_ERROR_RATE_KEY */
119  public static final float   IO_MAPFILE_BLOOM_ERROR_RATE_DEFAULT = 0.005f;
120  /** Codec class that implements Lzo compression algorithm */
121  public static final String  IO_COMPRESSION_CODEC_LZO_CLASS_KEY =
122    "io.compression.codec.lzo.class";
123  /** See <a href="{@docRoot}/../core-default.html">core-default.xml</a> */
124  public static final String  IO_MAP_INDEX_INTERVAL_KEY =
125    "io.map.index.interval";
126  /** Default value for IO_MAP_INDEX_INTERVAL_DEFAULT */
127  public static final int     IO_MAP_INDEX_INTERVAL_DEFAULT = 128;
128  /** See <a href="{@docRoot}/../core-default.html">core-default.xml</a> */
129  public static final String  IO_MAP_INDEX_SKIP_KEY = "io.map.index.skip";
130  /** Default value for IO_MAP_INDEX_SKIP_KEY */
131  public static final int     IO_MAP_INDEX_SKIP_DEFAULT = 0;
132  /** See <a href="{@docRoot}/../core-default.html">core-default.xml</a> */
133  public static final String  IO_SEQFILE_COMPRESS_BLOCKSIZE_KEY =
134    "io.seqfile.compress.blocksize";
135  /** Default value for IO_SEQFILE_COMPRESS_BLOCKSIZE_KEY */
136  public static final int     IO_SEQFILE_COMPRESS_BLOCKSIZE_DEFAULT = 1000000;
137  /** See <a href="{@docRoot}/../core-default.html">core-default.xml</a> */
138  public static final String  IO_FILE_BUFFER_SIZE_KEY =
139    "io.file.buffer.size";
140  /** Default value for IO_FILE_BUFFER_SIZE_KEY */
141  public static final int     IO_FILE_BUFFER_SIZE_DEFAULT = 4096;
142  /** See <a href="{@docRoot}/../core-default.html">core-default.xml</a> */
143  public static final String  IO_SKIP_CHECKSUM_ERRORS_KEY =
144    "io.skip.checksum.errors";
145  /** Default value for IO_SKIP_CHECKSUM_ERRORS_KEY */
146  public static final boolean IO_SKIP_CHECKSUM_ERRORS_DEFAULT = false;
147  /**
148   * @deprecated Moved to mapreduce, see mapreduce.task.io.sort.mb
149   * in mapred-default.xml
150   * See https://issues.apache.org/jira/browse/HADOOP-6801
151   */
152  public static final String  IO_SORT_MB_KEY = "io.sort.mb";
153  /** Default value for IO_SORT_MB_DEFAULT */
154  public static final int     IO_SORT_MB_DEFAULT = 100;
155  /**
156   * @deprecated Moved to mapreduce, see mapreduce.task.io.sort.factor
157   * in mapred-default.xml
158   * See https://issues.apache.org/jira/browse/HADOOP-6801
159   */
160  public static final String  IO_SORT_FACTOR_KEY = "io.sort.factor";
161  /** Default value for IO_SORT_FACTOR_DEFAULT */
162  public static final int     IO_SORT_FACTOR_DEFAULT = 100;
163  /** See <a href="{@docRoot}/../core-default.html">core-default.xml</a> */
164  public static final String  IO_SERIALIZATIONS_KEY = "io.serializations";
165
166  /** See <a href="{@docRoot}/../core-default.html">core-default.xml</a> */
167  public static final String  TFILE_IO_CHUNK_SIZE_KEY = "tfile.io.chunk.size";
168  /** Default value for TFILE_IO_CHUNK_SIZE_DEFAULT */
169  public static final int     TFILE_IO_CHUNK_SIZE_DEFAULT = 1024*1024;
170  /** See <a href="{@docRoot}/../core-default.html">core-default.xml</a> */
171  public static final String  TFILE_FS_INPUT_BUFFER_SIZE_KEY =
172    "tfile.fs.input.buffer.size";
173  /** Default value for TFILE_FS_INPUT_BUFFER_SIZE_KEY */
174  public static final int     TFILE_FS_INPUT_BUFFER_SIZE_DEFAULT = 256*1024;
175  /** See <a href="{@docRoot}/../core-default.html">core-default.xml</a> */
176  public static final String  TFILE_FS_OUTPUT_BUFFER_SIZE_KEY =
177    "tfile.fs.output.buffer.size";
178  /** Default value for TFILE_FS_OUTPUT_BUFFER_SIZE_KEY */
179  public static final int     TFILE_FS_OUTPUT_BUFFER_SIZE_DEFAULT = 256*1024;
180
181  /** See <a href="{@docRoot}/../core-default.html">core-default.xml</a> */
182  public static final String  IPC_CLIENT_CONNECTION_MAXIDLETIME_KEY =
183    "ipc.client.connection.maxidletime";
184  /** Default value for IPC_CLIENT_CONNECTION_MAXIDLETIME_KEY */
185  public static final int     IPC_CLIENT_CONNECTION_MAXIDLETIME_DEFAULT = 10000; // 10s
186  /** See <a href="{@docRoot}/../core-default.html">core-default.xml</a> */
187  public static final String  IPC_CLIENT_CONNECT_TIMEOUT_KEY =
188    "ipc.client.connect.timeout";
189  /** Default value for IPC_CLIENT_CONNECT_TIMEOUT_KEY */
190  public static final int     IPC_CLIENT_CONNECT_TIMEOUT_DEFAULT = 20000; // 20s
191  /** See <a href="{@docRoot}/../core-default.html">core-default.xml</a> */
192  public static final String  IPC_CLIENT_CONNECT_MAX_RETRIES_KEY =
193    "ipc.client.connect.max.retries";
194  /** Default value for IPC_CLIENT_CONNECT_MAX_RETRIES_KEY */
195  public static final int     IPC_CLIENT_CONNECT_MAX_RETRIES_DEFAULT = 10;
196  /** See <a href="{@docRoot}/../core-default.html">core-default.xml</a> */
197  public static final String  IPC_CLIENT_CONNECT_RETRY_INTERVAL_KEY =
198      "ipc.client.connect.retry.interval";
199  /** Default value for IPC_CLIENT_CONNECT_RETRY_INTERVAL_KEY */
200  public static final int     IPC_CLIENT_CONNECT_RETRY_INTERVAL_DEFAULT = 1000;
201  /** See <a href="{@docRoot}/../core-default.html">core-default.xml</a> */
202  public static final String  IPC_CLIENT_CONNECT_MAX_RETRIES_ON_SOCKET_TIMEOUTS_KEY =
203    "ipc.client.connect.max.retries.on.timeouts";
204  /** Default value for IPC_CLIENT_CONNECT_MAX_RETRIES_ON_SOCKET_TIMEOUTS_KEY */
205  public static final int  IPC_CLIENT_CONNECT_MAX_RETRIES_ON_SOCKET_TIMEOUTS_DEFAULT = 45;
206  /** See <a href="{@docRoot}/../core-default.html">core-default.xml</a> */
207  public static final String  IPC_CLIENT_TCPNODELAY_KEY =
208    "ipc.client.tcpnodelay";
209  /** Defalt value for IPC_CLIENT_TCPNODELAY_KEY */
210  public static final boolean IPC_CLIENT_TCPNODELAY_DEFAULT = true;
211  /** See <a href="{@docRoot}/../core-default.html">core-default.xml</a> */
212  public static final String  IPC_SERVER_LISTEN_QUEUE_SIZE_KEY =
213    "ipc.server.listen.queue.size";
214  /** Default value for IPC_SERVER_LISTEN_QUEUE_SIZE_KEY */
215  public static final int     IPC_SERVER_LISTEN_QUEUE_SIZE_DEFAULT = 128;
216  /** See <a href="{@docRoot}/../core-default.html">core-default.xml</a> */
217  public static final String  IPC_CLIENT_KILL_MAX_KEY = "ipc.client.kill.max";
218  /** Default value for IPC_CLIENT_KILL_MAX_KEY */
219  public static final int     IPC_CLIENT_KILL_MAX_DEFAULT = 10;
220  /** See <a href="{@docRoot}/../core-default.html">core-default.xml</a> */
221  public static final String  IPC_CLIENT_IDLETHRESHOLD_KEY =
222    "ipc.client.idlethreshold";
223  /** Default value for IPC_CLIENT_IDLETHRESHOLD_DEFAULT */
224  public static final int     IPC_CLIENT_IDLETHRESHOLD_DEFAULT = 4000;
225  /** See <a href="{@docRoot}/../core-default.html">core-default.xml</a> */
226  public static final String  IPC_SERVER_TCPNODELAY_KEY =
227    "ipc.server.tcpnodelay";
228  /** Default value for IPC_SERVER_TCPNODELAY_KEY */
229  public static final boolean IPC_SERVER_TCPNODELAY_DEFAULT = true;
230  /** See <a href="{@docRoot}/../core-default.html">core-default.xml</a> */
231  public static final String  IPC_SERVER_MAX_CONNECTIONS_KEY =
232    "ipc.server.max.connections";
233  /** Default value for IPC_SERVER_MAX_CONNECTIONS_KEY */
234  public static final int     IPC_SERVER_MAX_CONNECTIONS_DEFAULT = 0;
235
236  /** See <a href="{@docRoot}/../core-default.html">core-default.xml</a> */
237  public static final String  HADOOP_RPC_SOCKET_FACTORY_CLASS_DEFAULT_KEY =
238    "hadoop.rpc.socket.factory.class.default";
239  public static final String  HADOOP_RPC_SOCKET_FACTORY_CLASS_DEFAULT_DEFAULT =
240    "org.apache.hadoop.net.StandardSocketFactory";
241  /** See <a href="{@docRoot}/../core-default.html">core-default.xml</a> */
242  public static final String  HADOOP_SOCKS_SERVER_KEY = "hadoop.socks.server";
243  /** See <a href="{@docRoot}/../core-default.html">core-default.xml</a> */
244  public static final String  HADOOP_UTIL_HASH_TYPE_KEY =
245    "hadoop.util.hash.type";
246  /** Default value for HADOOP_UTIL_HASH_TYPE_KEY */
247  public static final String  HADOOP_UTIL_HASH_TYPE_DEFAULT = "murmur";
248  /** See <a href="{@docRoot}/../core-default.html">core-default.xml</a> */
249  public static final String  HADOOP_SECURITY_GROUP_MAPPING =
250    "hadoop.security.group.mapping";
251  /** See <a href="{@docRoot}/../core-default.html">core-default.xml</a> */
252  public static final String  HADOOP_SECURITY_GROUPS_CACHE_SECS =
253    "hadoop.security.groups.cache.secs";
254  /** See <a href="{@docRoot}/../core-default.html">core-default.xml</a> */
255  public static final long HADOOP_SECURITY_GROUPS_CACHE_SECS_DEFAULT =
256    300;
257  /** See <a href="{@docRoot}/../core-default.html">core-default.xml</a> */
258  public static final String  HADOOP_SECURITY_GROUPS_NEGATIVE_CACHE_SECS =
259    "hadoop.security.groups.negative-cache.secs";
260  /** See <a href="{@docRoot}/../core-default.html">core-default.xml</a> */
261  public static final long HADOOP_SECURITY_GROUPS_NEGATIVE_CACHE_SECS_DEFAULT =
262    30;
263  /** See <a href="{@docRoot}/../core-default.html">core-default.xml</a> */
264  public static final String HADOOP_SECURITY_GROUPS_CACHE_WARN_AFTER_MS =
265    "hadoop.security.groups.cache.warn.after.ms";
266  public static final long HADOOP_SECURITY_GROUPS_CACHE_WARN_AFTER_MS_DEFAULT =
267    5000;
268  /** See <a href="{@docRoot}/../core-default.html">core-default.xml</a> */
269  public static final String  HADOOP_SECURITY_AUTHENTICATION =
270    "hadoop.security.authentication";
271  /** See <a href="{@docRoot}/../core-default.html">core-default.xml</a> */
272  public static final String HADOOP_SECURITY_AUTHORIZATION =
273    "hadoop.security.authorization";
274  /** See <a href="{@docRoot}/../core-default.html">core-default.xml</a> */
275  public static final String HADOOP_SECURITY_INSTRUMENTATION_REQUIRES_ADMIN =
276    "hadoop.security.instrumentation.requires.admin";
277  /** See <a href="{@docRoot}/../core-default.html">core-default.xml</a> */
278  public static final String  HADOOP_SECURITY_SERVICE_USER_NAME_KEY =
279    "hadoop.security.service.user.name.key";
280  /** See <a href="{@docRoot}/../core-default.html">core-default.xml</a> */
281  public static final String  HADOOP_SECURITY_AUTH_TO_LOCAL =
282    "hadoop.security.auth_to_local";
283
284  @Deprecated
285  /** Only used by HttpServer. */
286  public static final String HADOOP_SSL_ENABLED_KEY = "hadoop.ssl.enabled";
287  @Deprecated
288  /** Only used by HttpServer. */
289  public static final boolean HADOOP_SSL_ENABLED_DEFAULT = false;
290
291
292  // HTTP policies to be used in configuration
293  // Use HttpPolicy.name() instead
294  @Deprecated
295  public static final String HTTP_POLICY_HTTP_ONLY = "HTTP_ONLY";
296  @Deprecated
297  public static final String HTTP_POLICY_HTTPS_ONLY = "HTTPS_ONLY";
298  /** See <a href="{@docRoot}/../core-default.html">core-default.xml</a> */
299  public static final String  HADOOP_RPC_PROTECTION =
300    "hadoop.rpc.protection";
301  /** Class to override Sasl Properties for a connection */
302  public static final String  HADOOP_SECURITY_SASL_PROPS_RESOLVER_CLASS =
303    "hadoop.security.saslproperties.resolver.class";
304  public static final String HADOOP_SECURITY_CRYPTO_CODEC_CLASSES_KEY_PREFIX = 
305    "hadoop.security.crypto.codec.classes";
306  /** See <a href="{@docRoot}/../core-default.html">core-default.xml</a> */
307  public static final String HADOOP_SECURITY_CRYPTO_CIPHER_SUITE_KEY =
308    "hadoop.security.crypto.cipher.suite";
309  public static final String HADOOP_SECURITY_CRYPTO_CIPHER_SUITE_DEFAULT = 
310    "AES/CTR/NoPadding";
311  /** See <a href="{@docRoot}/../core-default.html">core-default.xml</a> */
312  public static final String HADOOP_SECURITY_CRYPTO_JCE_PROVIDER_KEY =
313    "hadoop.security.crypto.jce.provider";
314  /** See <a href="{@docRoot}/../core-default.html">core-default.xml</a> */
315  public static final String HADOOP_SECURITY_CRYPTO_BUFFER_SIZE_KEY = 
316    "hadoop.security.crypto.buffer.size";
317  /** Defalt value for HADOOP_SECURITY_CRYPTO_BUFFER_SIZE_KEY */
318  public static final int HADOOP_SECURITY_CRYPTO_BUFFER_SIZE_DEFAULT = 8192;
319  /** Class to override Impersonation provider */
320  public static final String  HADOOP_SECURITY_IMPERSONATION_PROVIDER_CLASS =
321    "hadoop.security.impersonation.provider.class";
322
323  //  <!-- KMSClientProvider configurations -->
324  /** See <a href="{@docRoot}/../core-default.html">core-default.xml</a> */
325  public static final String KMS_CLIENT_ENC_KEY_CACHE_SIZE =
326      "hadoop.security.kms.client.encrypted.key.cache.size";
327  /** Default value for KMS_CLIENT_ENC_KEY_CACHE_SIZE */
328  public static final int KMS_CLIENT_ENC_KEY_CACHE_SIZE_DEFAULT = 500;
329
330  /** See <a href="{@docRoot}/../core-default.html">core-default.xml</a> */
331  public static final String KMS_CLIENT_ENC_KEY_CACHE_LOW_WATERMARK =
332      "hadoop.security.kms.client.encrypted.key.cache.low-watermark";
333  /** Default value for KMS_CLIENT_ENC_KEY_CACHE_LOW_WATERMARK */
334  public static final float KMS_CLIENT_ENC_KEY_CACHE_LOW_WATERMARK_DEFAULT =
335      0.3f;
336
337  /** See <a href="{@docRoot}/../core-default.html">core-default.xml</a> */
338  public static final String KMS_CLIENT_ENC_KEY_CACHE_NUM_REFILL_THREADS =
339      "hadoop.security.kms.client.encrypted.key.cache.num.refill.threads";
340  /** Default value for KMS_CLIENT_ENC_KEY_NUM_REFILL_THREADS */
341  public static final int KMS_CLIENT_ENC_KEY_CACHE_NUM_REFILL_THREADS_DEFAULT =
342      2;
343
344  /** See <a href="{@docRoot}/../core-default.html">core-default.xml</a> */
345  public static final String KMS_CLIENT_ENC_KEY_CACHE_EXPIRY_MS =
346      "hadoop.security.kms.client.encrypted.key.cache.expiry";
347  /** Default value for KMS_CLIENT_ENC_KEY_CACHE_EXPIRY (12 hrs)*/
348  public static final int KMS_CLIENT_ENC_KEY_CACHE_EXPIRY_DEFAULT = 43200000;
349
350  /** See <a href="{@docRoot}/../core-default.html">core-default.xml</a> */
351  public static final String HADOOP_SECURITY_JAVA_SECURE_RANDOM_ALGORITHM_KEY = 
352    "hadoop.security.java.secure.random.algorithm";
353  /** Defalt value for HADOOP_SECURITY_JAVA_SECURE_RANDOM_ALGORITHM_KEY */
354  public static final String HADOOP_SECURITY_JAVA_SECURE_RANDOM_ALGORITHM_DEFAULT = 
355    "SHA1PRNG";
356  /** See <a href="{@docRoot}/../core-default.html">core-default.xml</a> */
357  public static final String HADOOP_SECURITY_SECURE_RANDOM_IMPL_KEY = 
358    "hadoop.security.secure.random.impl";
359  /** See <a href="{@docRoot}/../core-default.html">core-default.xml</a> */
360  public static final String HADOOP_SECURITY_SECURE_RANDOM_DEVICE_FILE_PATH_KEY = 
361    "hadoop.security.random.device.file.path";
362  public static final String HADOOP_SECURITY_SECURE_RANDOM_DEVICE_FILE_PATH_DEFAULT = 
363    "/dev/urandom";
364}
365