KeyVersions and Metadatato avoid burst
- of requests to hit the underlying KeyProvider.]]>
- KeyProvider
-
- @param encryptionKeyName
- The latest KeyVersion of this key's material will be encrypted.
- @return EncryptedKeyVersion with the generated key material, the version
- name is 'EEK' (for Encrypted Encryption Key)
- @throws IOException
- thrown if the key material could not be generated
- @throws GeneralSecurityException
- thrown if the key material could not be encrypted because of a
- cryptographic issue.]]>
- KeyProvider implements the
- {@link DelegationTokenExtension} interface the KeyProvider
- itself will provide the extension functionality, otherwise a default
- extension implementation will be used.
-
- @param keyProvider KeyProvider to use to create the
- KeyProviderDelegationTokenExtension extension.
- @return a KeyProviderDelegationTokenExtension instance
- using the given KeyProvider.]]>
- f is not supported
- @throws IOException If an I/O error occurred
-
- Exceptions applicable to file systems accessed over RPC:
- @throws RpcClientException If an exception occurred in the RPC client
- @throws RpcServerException If an exception occurred in the RPC server
- @throws UnexpectedServerException If server implementation throws
- undeclared exception to RPC server]]>
- pathPattern is not supported
- @throws IOException If an I/O error occurred
-
- Exceptions applicable to file systems accessed over RPC:
- @throws RpcClientException If an exception occurred in the RPC client
- @throws RpcServerException If an exception occurred in the RPC server
- @throws UnexpectedServerException If server implementation throws
- undeclared exception to RPC server]]>
- f is
- not supported
- @throws IOException If an I/O error occurred
-
- Exceptions applicable to file systems accessed over RPC:
- @throws RpcClientException If an exception occurred in the RPC client
- @throws RpcServerException If an exception occurred in the RPC server
- @throws UnexpectedServerException If server implementation throws
- undeclared exception to RPC server]]>
- f
- is not supported
- @throws IOException If an I/O error occurred
-
- Exceptions applicable to file systems accessed over RPC:
- @throws RpcClientException If an exception occurred in the RPC client
- @throws RpcServerException If an exception occurred in the RPC server
- @throws UnexpectedServerException If server implementation throws
- undeclared exception to RPC server]]>
- - A filename pattern is composed of regular characters and - special pattern matching characters, which are: - -
-
-
-
-
-
-
-
-
pathPattern is not supported
- @throws IOException If an I/O error occurred
-
- Exceptions applicable to file systems accessed over RPC:
- @throws RpcClientException If an exception occurred in the RPC client
- @throws RpcServerException If an exception occurred in the RPC server
- @throws UnexpectedServerException If server implementation throws
- undeclared exception to RPC server]]>
- src does not exist
- @throws ParentNotDirectoryException If parent of dst is not
- a directory
- @throws UnsupportedFileSystemException If file system for
- src or dst is not supported
- @throws IOException If an I/O error occurred
-
- Exceptions applicable to file systems accessed over RPC:
- @throws RpcClientException If an exception occurred in the RPC client
- @throws RpcServerException If an exception occurred in the RPC server
- @throws UnexpectedServerException If server implementation throws
- undeclared exception to RPC server
-
- RuntimeExceptions:
- @throws InvalidPathException If path dst is invalid]]>
- har]]>
-
- shell(/path/to/my/script.sh arg1 arg2 ...)
- - - The shell command will be run with an environment set up to contain - all of the current Hadoop configuration variables, with the '_' character - replacing any '.' characters in the configuration keys.
- - If the shell command returns an exit code of 0, the fencing is - determined to be successful. If it returns any other exit code, the - fencing was not successful and the next fencing method in the list - will be attempted.
- - Note: this fencing method does not implement any timeout. - If timeouts are necessary, they should be implemented in the shell - script itself (eg by forking a subshell to kill its parent in - some number of seconds).]]> -
- It returns a successful status code if: -
fuser indicates it successfully killed a process, or
- nc -z indicates that nothing is listening on the target port
-
- This fencing mechanism is configured as following in the fencing method
- list:
- sshfence([[username][:ssh-port]])
- where the optional argument specifies the username and port to use
- with ssh.
-
- In order to achieve passwordless SSH, the operator must also configure
- dfs.ha.fencing.ssh.private-key-files to point to an
- SSH key that has passphrase-less access to the given username and host.]]>
-
val. Returns true if such a pair exists and false when at
- the end of the map]]>
- key. Otherwise,
- return the record that sorts just after.
- @return - the key that was the closest match or null if eof.]]>
- val. Returns true if such a pair exists and false when at
- end of file]]>
- key, or null if no match exists.]]>
- - Use {@link Scanner#advance()} to move the cursor to the next key-value - pair (or end if none exists). Use seekTo methods ( - {@link Scanner#seekTo(byte[])} or - {@link Scanner#seekTo(byte[], int, int)}) to seek to any arbitrary - location in the covered range (including backward seeking). Use - {@link Scanner#rewind()} to seek back to the beginning of the scanner. - Use {@link Scanner#seekToEnd()} to seek to the end of the scanner. -
- Actual keys and values may be obtained through {@link Scanner.Entry} - object, which is obtained through {@link Scanner#entry()}.]]> -
qry parameter
- may be used to query only a subset of the JMX Beans. This query
- functionality is provided through the
- {@link MBeanServer#queryNames(ObjectName, javax.management.QueryExp)}
- method.
-
- For example http://.../jmx?qry=Hadoop:* will return
- all hadoop metrics exposed through JMX.
-
- The optional
- For example
-
- If the
- If a resouce such as a mbean or attribute can not be found,
- a 404 SC_NOT_FOUND http response code will be returned.
-
- The return format is JSON and in the form
-
-
- The servlet attempts to convert the the JMXBeans into JSON. Each
- bean's attributes will be converted to a JSON object member.
-
- If the attribute is a boolean, a number, a string, or an array
- it will be converted to the JSON equivalent.
-
- If the value is a {@link CompositeData} then it will be converted
- to a JSON object with the keys as the name of the JSON member and
- the value is converted following these same rules.
-
- If the value is a {@link TabularData} then it will be converted
- to an array of the {@link CompositeData} elements that it contains.
-
- All other objects will be converted to a string and output as such.
-
- The bean's name and modelerType will be returned for all beans.]]>
- get parameter is used to query an specific
- attribute of a JMX bean. The format of the URL is
- http://.../jmx?get=MXBeanName::AttributeName
-
- http://../jmx?get=Hadoop:service=NameNode,name=NameNodeInfo::ClusterId
- will return the cluster id of the namenode mxbean.
- qry or the get parameter is not formatted
- correctly then a 400 BAD REQUEST http response code will be returned.
-
- {
- "beans" : [
- {
- "name":"bean-name"
- ...
- }
- ]
- }
-
- {"name":"test","time":1318429136789,"date":"2011-10-12 15:18:56,789","level":"INFO","thread":"main","message":"test message"}
-
-
- An event with an error will contain data similar to that below (which has been reformatted to be multi-line).
-
-
- {
- "name":"testException",
- "time":1318429136789,
- "date":"2011-10-12 15:18:56,789",
- "level":"INFO",
- "thread":"quoted\"",
- "message":"new line\n and {}",
- "exceptionclass":"java.net.NoRouteToHostException",
- "stack":[
- "java.net.NoRouteToHostException: that box caught fire 3 years ago",
- "\tat org.apache.hadoop.log.TestLog4Json.testException(TestLog4Json.java:49)",
- "\tat sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)",
- "\tat sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)",
- "\tat sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)",
- "\tat java.lang.reflect.Method.invoke(Method.java:597)",
- "\tat junit.framework.TestCase.runTest(TestCase.java:168)",
- "\tat junit.framework.TestCase.runBare(TestCase.java:134)",
- "\tat junit.framework.TestResult$1.protect(TestResult.java:110)",
- "\tat junit.framework.TestResult.runProtected(TestResult.java:128)",
- "\tat junit.framework.TestResult.run(TestResult.java:113)",
- "\tat junit.framework.TestCase.run(TestCase.java:124)",
- "\tat junit.framework.TestSuite.runTest(TestSuite.java:232)",
- "\tat junit.framework.TestSuite.run(TestSuite.java:227)",
- "\tat org.junit.internal.runners.JUnit38ClassRunner.run(JUnit38ClassRunner.java:83)",
- "\tat org.apache.maven.surefire.junit4.JUnit4TestSet.execute(JUnit4TestSet.java:59)",
- "\tat org.apache.maven.surefire.suite.AbstractDirectoryTestSuite.executeTestSet(AbstractDirectoryTestSuite.java:120)",
- "\tat org.apache.maven.surefire.suite.AbstractDirectoryTestSuite.execute(AbstractDirectoryTestSuite.java:145)",
- "\tat org.apache.maven.surefire.Surefire.run(Surefire.java:104)",
- "\tat sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)",
- "\tat sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)",
- "\tat sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)",
- "\tat java.lang.reflect.Method.invoke(Method.java:597)",
- "\tat org.apache.maven.surefire.booter.SurefireBooter.runSuitesInProcess(SurefireBooter.java:290)",
- "\tat org.apache.maven.surefire.booter.SurefireBooter.main(SurefireBooter.java:1017)"
- ]
- }
- ]]>
- core-default.xml file, after the comment
- 'HTTP Authentication' for details on the configuration options.
- All related configuration properties have 'hadoop.http.authentication.'
- as prefix.]]>
- -' (dash) and '.' (dot) separators,1.0alpha1 => [1, 0, alpha, 1]alpha or abeta or bmilestone or mrc or crsnapshot(the empty string) or ga or finalspShutdownHookManager singleton.]]>
- - During name node startup {@link SafeModeInfo} counts the number of - safe blocks, those that have at least the minimal number of - replicas, and calculates the ratio of safe blocks to the total number - of blocks in the system, which is the size of blocks in - {@link FSNamesystem#blockManager}. When the ratio reaches the - {@link #threshold} it starts the SafeModeMonitor daemon in order - to monitor whether the safe mode {@link #extension} is passed. - Then it leaves safe mode and destroys itself. -
- If safe mode is turned on manually then the number of safe blocks is - not tracked because the name node is not intended to leave safe mode - automatically in the case. - - @see ClientProtocol#setSafeMode(HdfsConstants.SafeModeAction, boolean)]]> -
webhdfs]]>
- Configuration so
- that any necessary internal modifications do not reflect on the incoming
- parameter.
-
- @param cluster cluster
- @param status job status
- @param conf job configuration
- @return the {@link Job} , with no connection to a cluster yet.
- @throws IOException]]>
- NodeManager are
- available.
-
-
- - Once a callback happens, the users can chose to act on it in blocking or - non-blocking manner. If the action on callback is done in a blocking - manner, some of the threads performing requests on NodeManagers may get - blocked depending on how many threads in the pool are busy. -
- -- The implementation of the callback function should not throw the - unexpected exception. Otherwise, {@link NMClientAsync} will just - catch, log and then ignore it. -
]]> -Nodes]]>
-