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core-site.xml配置项  

2013-10-23 00:13:34|  分类: hadoop2 |  标签: |举报 |字号 订阅

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name value description
hadoop.common.configuration.version 0.23.0 version of this configuration file
hadoop.tmp.dir /tmp/hadoop-${user.name} A base for other temporary directories.
io.native.lib.available true Should native hadoop libraries, if present, be used.
hadoop.http.filter.initializers org.apache.hadoop.http.lib.StaticUserWebFilter A comma separated list of class names. Each class in the list must extend org.apache.hadoop.http.FilterInitializer. The corresponding Filter will be initialized. Then, the Filter will be applied to all user facing jsp and servlet web pages. The ordering of the list defines the ordering of the filters.
hadoop.security.authorization false Is service-level authorization enabled?
hadoop.security.instrumentation.requires.admin false Indicates if administrator ACLs are required to access instrumentation servlets (JMX, METRICS, CONF, STACKS).
hadoop.security.authentication simple Possible values are simple (no authentication), and kerberos
hadoop.security.group.mapping org.apache.hadoop.security.JniBasedUnixGroupsMappingWithFallback Class for user to group mapping (get groups for a given user) for ACL. The default implementation, org.apache.hadoop.security.JniBasedUnixGroupsMappingWithFallback, will determine if the Java Native Interface (JNI) is available. If JNI is available the implementation will use the API within hadoop to resolve a list of groups for a user. If JNI is not available then the shell implementation, ShellBasedUnixGroupsMapping, is used. This implementation shells out to the Linux/Unix environment with the bash -c groups command to resolve a list of groups for a user.
hadoop.security.groups.cache.secs 300 This is the config controlling the validity of the entries in the cache containing the user->group mapping. When this duration has expired, then the implementation of the group mapping provider is invoked to get the groups of the user and then cached back.
hadoop.security.group.mapping.ldap.url
The URL of the LDAP server to use for resolving user groups when using the LdapGroupsMapping user to group mapping.
hadoop.security.group.mapping.ldap.ssl false Whether or not to use SSL when connecting to the LDAP server.
hadoop.security.group.mapping.ldap.ssl.keystore
File path to the SSL keystore that contains the SSL certificate required by the LDAP server.
hadoop.security.group.mapping.ldap.ssl.keystore.password.file
The path to a file containing the password of the LDAP SSL keystore. IMPORTANT: This file should be readable only by the Unix user running the daemons.
hadoop.security.group.mapping.ldap.bind.user
The distinguished name of the user to bind as when connecting to the LDAP server. This may be left blank if the LDAP server supports anonymous binds.
hadoop.security.group.mapping.ldap.bind.password.file
The path to a file containing the password of the bind user. IMPORTANT: This file should be readable only by the Unix user running the daemons.
hadoop.security.group.mapping.ldap.base
The search base for the LDAP connection. This is a distinguished name, and will typically be the root of the LDAP directory.
hadoop.security.group.mapping.ldap.search.filter.user (&(objectClass=user)(sAMAccountName={0})) An additional filter to use when searching for LDAP users. The default will usually be appropriate for Active Directory installations. If connecting to an LDAP server with a non-AD schema, this should be replaced with (&(objectClass=inetOrgPerson)(uid={0}). {0} is a special string used to denote where the username fits into the filter.
hadoop.security.group.mapping.ldap.search.filter.group (objectClass=group) An additional filter to use when searching for LDAP groups. This should be changed when resolving groups against a non-Active Directory installation. posixGroups are currently not a supported group class.
hadoop.security.group.mapping.ldap.search.attr.member member The attribute of the group object that identifies the users that are members of the group. The default will usually be appropriate for any LDAP installation.
hadoop.security.group.mapping.ldap.search.attr.group.name cn The attribute of the group object that identifies the group name. The default will usually be appropriate for all LDAP systems.
hadoop.security.group.mapping.ldap.directory.search.timeout 10000 The attribute applied to the LDAP SearchControl properties to set a maximum time limit when searching and awaiting a result. Set to 0 if infinite wait period is desired. Default is 10 seconds. Units in milliseconds.
hadoop.security.service.user.name.key
For those cases where the same RPC protocol is implemented by multiple servers, this configuration is required for specifying the principal name to use for the service when the client wishes to make an RPC call.
hadoop.security.uid.cache.secs 14400 This is the config controlling the validity of the entries in the cache containing the userId to userName and groupId to groupName used by NativeIO getFstat().
hadoop.rpc.protection authentication This field sets the quality of protection for secured sasl connections. Possible values are authentication, integrity and privacy. authentication means authentication only and no integrity or privacy; integrity implies authentication and integrity are enabled; and privacy implies all of authentication, integrity and privacy are enabled.
hadoop.work.around.non.threadsafe.getpwuid false Some operating systems or authentication modules are known to have broken implementations of getpwuid_r and getpwgid_r, such that these calls are not thread-safe. Symptoms of this problem include JVM crashes with a stack trace inside these functions. If your system exhibits this issue, enable this configuration parameter to include a lock around the calls as a workaround. An incomplete list of some systems known to have this issue is available at http://wiki.apache.org/hadoop/KnownBrokenPwuidImplementations
hadoop.kerberos.kinit.command kinit Used to periodically renew Kerberos credentials when provided to Hadoop. The default setting assumes that kinit is in the PATH of users running the Hadoop client. Change this to the absolute path to kinit if this is not the case.
hadoop.security.auth_to_local
Maps kerberos principals to local user names
io.file.buffer.size 4096 The size of buffer for use in sequence files. The size of this buffer should probably be a multiple of hardware page size (4096 on Intel x86), and it determines how much data is buffered during read and write operations.
io.bytes.per.checksum 512 The number of bytes per checksum. Must not be larger than io.file.buffer.size.
io.skip.checksum.errors false If true, when a checksum error is encountered while reading a sequence file, entries are skipped, instead of throwing an exception.
io.compression.codecs
A comma-separated list of the compression codec classes that can be used for compression/decompression. In addition to any classes specified with this property (which take precedence), codec classes on the classpath are discovered using a Java ServiceLoader.
io.compression.codec.bzip2.library system-native The native-code library to be used for compression and decompression by the bzip2 codec. This library could be specified either by by name or the full pathname. In the former case, the library is located by the dynamic linker, usually searching the directories specified in the environment variable LD_LIBRARY_PATH. The value of "system-native" indicates that the default system library should be used. To indicate that the algorithm should operate entirely in Java, specify "java-builtin".
io.serializations org.apache.hadoop.io.serializer.WritableSerialization,org.apache.hadoop.io.serializer.avro.AvroSpecificSerialization,org.apache.hadoop.io.serializer.avro.AvroReflectSerialization A list of serialization classes that can be used for obtaining serializers and deserializers.
io.seqfile.local.dir ${hadoop.tmp.dir}/io/local The local directory where sequence file stores intermediate data files during merge. May be a comma-separated list of directories on different devices in order to spread disk i/o. Directories that do not exist are ignored.
io.map.index.skip 0 Number of index entries to skip between each entry. Zero by default. Setting this to values larger than zero can facilitate opening large MapFiles using less memory.
io.map.index.interval 128 MapFile consist of two files - data file (tuples) and index file (keys). For every io.map.index.interval records written in the data file, an entry (record-key, data-file-position) is written in the index file. This is to allow for doing binary search later within the index file to look up records by their keys and get their closest positions in the data file.
fs.defaultFS file:/// The name of the default file system. A URI whose scheme and authority determine the FileSystem implementation. The uri's scheme determines the config property (fs.SCHEME.impl) naming the FileSystem implementation class. The uri's authority is used to determine the host, port, etc. for a filesystem.
fs.default.name file:/// Deprecated. Use (fs.defaultFS) property instead
fs.trash.interval 0 Number of minutes after which the checkpoint gets deleted. If zero, the trash feature is disabled. This option may be configured both on the server and the client. If trash is disabled server side then the client side configuration is checked. If trash is enabled on the server side then the value configured on the server is used and the client configuration value is ignored.
fs.trash.checkpoint.interval 0 Number of minutes between trash checkpoints. Should be smaller or equal to fs.trash.interval. If zero, the value is set to the value of fs.trash.interval. Every time the checkpointer runs it creates a new checkpoint out of current and removes checkpoints created more than fs.trash.interval minutes ago.
fs.AbstractFileSystem.file.impl org.apache.hadoop.fs.local.LocalFs The AbstractFileSystem for file: uris.
fs.AbstractFileSystem.hdfs.impl org.apache.hadoop.fs.Hdfs The FileSystem for hdfs: uris.
fs.AbstractFileSystem.viewfs.impl org.apache.hadoop.fs.viewfs.ViewFs The AbstractFileSystem for view file system for viewfs: uris (ie client side mount table:).
fs.ftp.host 0.0.0.0 FTP filesystem connects to this server
fs.ftp.host.port 21 FTP filesystem connects to fs.ftp.host on this port
fs.df.interval 60000 Disk usage statistics refresh interval in msec.
fs.s3.block.size 67108864 Block size to use when writing files to S3.
fs.s3.buffer.dir ${hadoop.tmp.dir}/s3 Determines where on the local filesystem the S3 filesystem should store files before sending them to S3 (or after retrieving them from S3).
fs.s3.maxRetries 4 The maximum number of retries for reading or writing files to S3, before we signal failure to the application.
fs.s3.sleepTimeSeconds 10 The number of seconds to sleep between each S3 retry.
fs.automatic.close true By default, FileSystem instances are automatically closed at program exit using a JVM shutdown hook. Setting this property to false disables this behavior. This is an advanced option that should only be used by server applications requiring a more carefully orchestrated shutdown sequence.
fs.s3n.block.size 67108864 Block size to use when reading files using the native S3 filesystem (s3n: URIs).
io.seqfile.compress.blocksize 1000000 The minimum block size for compression in block compressed SequenceFiles.
io.seqfile.lazydecompress true Should values of block-compressed SequenceFiles be decompressed only when necessary.
io.seqfile.sorter.recordlimit 1000000 The limit on number of records to be kept in memory in a spill in SequenceFiles.Sorter
io.mapfile.bloom.size 1048576 The size of BloomFilter-s used in BloomMapFile. Each time this many keys is appended the next BloomFilter will be created (inside a DynamicBloomFilter). Larger values minimize the number of filters, which slightly increases the performance, but may waste too much space if the total number of keys is usually much smaller than this number.
io.mapfile.bloom.error.rate 0.005 The rate of false positives in BloomFilter-s used in BloomMapFile. As this value decreases, the size of BloomFilter-s increases exponentially. This value is the probability of encountering false positives (default is 0.5%).
hadoop.util.hash.type murmur The default implementation of Hash. Currently this can take one of the two values: 'murmur' to select MurmurHash and 'jenkins' to select JenkinsHash.
ipc.client.idlethreshold 4000 Defines the threshold number of connections after which connections will be inspected for idleness.
ipc.client.kill.max 10 Defines the maximum number of clients to disconnect in one go.
ipc.client.connection.maxidletime 10000 The maximum time in msec after which a client will bring down the connection to the server.
ipc.client.connect.max.retries 10 Indicates the number of retries a client will make to establish a server connection.
ipc.client.connect.timeout 20000 Indicates the number of milliseconds a client will wait for the socket to establish a server connection.
ipc.client.connect.max.retries.on.timeouts 45 Indicates the number of retries a client will make on socket timeout to establish a server connection.
ipc.server.listen.queue.size 128 Indicates the length of the listen queue for servers accepting client connections.
ipc.server.tcpnodelay false Turn on/off Nagle's algorithm for the TCP socket connection on the server. Setting to true disables the algorithm and may decrease latency with a cost of more/smaller packets.
ipc.client.tcpnodelay false Turn on/off Nagle's algorithm for the TCP socket connection on the client. Setting to true disables the algorithm and may decrease latency with a cost of more/smaller packets.
hadoop.rpc.socket.factory.class.default org.apache.hadoop.net.StandardSocketFactory Default SocketFactory to use. This parameter is expected to be formatted as "package.FactoryClassName".
hadoop.rpc.socket.factory.class.ClientProtocol
SocketFactory to use to connect to a DFS. If null or empty, use hadoop.rpc.socket.class.default. This socket factory is also used by DFSClient to create sockets to DataNodes.
hadoop.socks.server
Address (host:port) of the SOCKS server to be used by the SocksSocketFactory.
net.topology.node.switch.mapping.impl org.apache.hadoop.net.ScriptBasedMapping The default implementation of the DNSToSwitchMapping. It invokes a script specified in net.topology.script.file.name to resolve node names. If the value for net.topology.script.file.name is not set, the default value of DEFAULT_RACK is returned for all node names.
net.topology.impl org.apache.hadoop.net.NetworkTopology The default implementation of NetworkTopology which is classic three layer one.
net.topology.script.file.name
The script name that should be invoked to resolve DNS names to NetworkTopology names. Example: the script would take host.foo.bar as an argument, and return /rack1 as the output.
net.topology.script.number.args 100 The max number of args that the script configured with net.topology.script.file.name should be run with. Each arg is an IP address.
net.topology.table.file.name
The file name for a topology file, which is used when the net.topology.node.switch.mapping.impl property is set to org.apache.hadoop.net.TableMapping. The file format is a two column text file, with columns separated by whitespace. The first column is a DNS or IP address and the second column specifies the rack where the address maps. If no entry corresponding to a host in the cluster is found, then /default-rack is assumed.
file.stream-buffer-size 4096 The size of buffer to stream files. The size of this buffer should probably be a multiple of hardware page size (4096 on Intel x86), and it determines how much data is buffered during read and write operations.
file.bytes-per-checksum 512 The number of bytes per checksum. Must not be larger than file.stream-buffer-size
file.client-write-packet-size 65536 Packet size for clients to write
file.blocksize 67108864 Block size
file.replication 1 Replication factor
s3.stream-buffer-size 4096 The size of buffer to stream files. The size of this buffer should probably be a multiple of hardware page size (4096 on Intel x86), and it determines how much data is buffered during read and write operations.
s3.bytes-per-checksum 512 The number of bytes per checksum. Must not be larger than s3.stream-buffer-size
s3.client-write-packet-size 65536 Packet size for clients to write
s3.blocksize 67108864 Block size
s3.replication 3 Replication factor
s3native.stream-buffer-size 4096 The size of buffer to stream files. The size of this buffer should probably be a multiple of hardware page size (4096 on Intel x86), and it determines how much data is buffered during read and write operations.
s3native.bytes-per-checksum 512 The number of bytes per checksum. Must not be larger than s3native.stream-buffer-size
s3native.client-write-packet-size 65536 Packet size for clients to write
s3native.blocksize 67108864 Block size
s3native.replication 3 Replication factor
ftp.stream-buffer-size 4096 The size of buffer to stream files. The size of this buffer should probably be a multiple of hardware page size (4096 on Intel x86), and it determines how much data is buffered during read and write operations.
ftp.bytes-per-checksum 512 The number of bytes per checksum. Must not be larger than ftp.stream-buffer-size
ftp.client-write-packet-size 65536 Packet size for clients to write
ftp.blocksize 67108864 Block size
ftp.replication 3 Replication factor
tfile.io.chunk.size 1048576 Value chunk size in bytes. Default to 1MB. Values of the length less than the chunk size is guaranteed to have known value length in read time (See also TFile.Reader.Scanner.Entry.isValueLengthKnown()).
tfile.fs.output.buffer.size 262144 Buffer size used for FSDataOutputStream in bytes.
tfile.fs.input.buffer.size 262144 Buffer size used for FSDataInputStream in bytes.
hadoop.http.authentication.type simple Defines authentication used for Oozie HTTP endpoint. Supported values are: simple | kerberos | #AUTHENTICATION_HANDLER_CLASSNAME#
hadoop.http.authentication.token.validity 36000 Indicates how long (in seconds) an authentication token is valid before it has to be renewed.
hadoop.http.authentication.signature.secret.file ${user.home}/hadoop-http-auth-signature-secret The signature secret for signing the authentication tokens. The same secret should be used for JT/NN/DN/TT configurations.
hadoop.http.authentication.cookie.domain
The domain to use for the HTTP cookie that stores the authentication token. In order to authentiation to work correctly across all Hadoop nodes web-consoles the domain must be correctly set. IMPORTANT: when using IP addresses, browsers ignore cookies with domain settings. For this setting to work properly all nodes in the cluster must be configured to generate URLs with hostname.domain names on it.
hadoop.http.authentication.simple.anonymous.allowed true Indicates if anonymous requests are allowed when using 'simple' authentication.
hadoop.http.authentication.kerberos.principal HTTP/_HOST@LOCALHOST Indicates the Kerberos principal to be used for HTTP endpoint. The principal MUST start with 'HTTP/' as per Kerberos HTTP SPNEGO specification.
hadoop.http.authentication.kerberos.keytab ${user.home}/hadoop.keytab Location of the keytab file with the credentials for the principal. Referring to the same keytab file Oozie uses for its Kerberos credentials for Hadoop.
dfs.ha.fencing.methods
List of fencing methods to use for service fencing. May contain builtin methods (eg shell and sshfence) or user-defined method.
dfs.ha.fencing.ssh.connect-timeout 30000 SSH connection timeout, in milliseconds, to use with the builtin sshfence fencer.
dfs.ha.fencing.ssh.private-key-files
The SSH private key files to use with the builtin sshfence fencer.
hadoop.http.staticuser.user dr.who The user name to filter as, on static web filters while rendering content. An example use is the HDFS web UI (user to be used for browsing files).
ha.zookeeper.quorum
A list of ZooKeeper server addresses, separated by commas, that are to be used by the ZKFailoverController in automatic failover.
ha.zookeeper.session-timeout.ms 5000 The session timeout to use when the ZKFC connects to ZooKeeper. Setting this value to a lower value implies that server crashes will be detected more quickly, but risks triggering failover too aggressively in the case of a transient error or network blip.
ha.zookeeper.parent-znode /hadoop-ha The ZooKeeper znode under which the ZK failover controller stores its information. Note that the nameservice ID is automatically appended to this znode, so it is not normally necessary to configure this, even in a federated environment.
ha.zookeeper.acl world:anyone:rwcda A comma-separated list of ZooKeeper ACLs to apply to the znodes used by automatic failover. These ACLs are specified in the same format as used by the ZooKeeper CLI. If the ACL itself contains secrets, you may instead specify a path to a file, prefixed with the '@' symbol, and the value of this configuration will be loaded from within.
ha.zookeeper.auth
A comma-separated list of ZooKeeper authentications to add when connecting to ZooKeeper. These are specified in the same format as used by the "addauth" command in the ZK CLI. It is important that the authentications specified here are sufficient to access znodes with the ACL specified in ha.zookeeper.acl. If the auths contain secrets, you may instead specify a path to a file, prefixed with the '@' symbol, and the value of this configuration will be loaded from within.
hadoop.ssl.keystores.factory.class org.apache.hadoop.security.ssl.FileBasedKeyStoresFactory The keystores factory to use for retrieving certificates.
hadoop.ssl.require.client.cert false Whether client certificates are required
hadoop.ssl.hostname.verifier DEFAULT The hostname verifier to provide for HttpsURLConnections. Valid values are: DEFAULT, STRICT, STRICT_I6, DEFAULT_AND_LOCALHOST and ALLOW_ALL
hadoop.ssl.server.conf ssl-server.xml Resource file from which ssl server keystore information will be extracted. This file is looked up in the classpath, typically it should be in Hadoop conf/ directory.
hadoop.ssl.client.conf ssl-client.xml Resource file from which ssl client keystore information will be extracted This file is looked up in the classpath, typically it should be in Hadoop conf/ directory.
hadoop.ssl.enabled false Whether to use SSL for the HTTP endpoints. If set to true, the NameNode, DataNode, ResourceManager, NodeManager, HistoryServer and MapReduceAppMaster web UIs will be served over HTTPS instead HTTP.
hadoop.jetty.logs.serve.aliases true Enable/Disable aliases serving from jetty
fs.permissions.umask-mode 22 The umask used when creating files and directories. Can be in octal or in symbolic. Examples are: "022" (octal for u=rwx,g=r-x,o=r-x in symbolic), or "u=rwx,g=rwx,o=" (symbolic for 007 in octal).
ha.health-monitor.connect-retry-interval.ms 1000 How often to retry connecting to the service.
ha.health-monitor.check-interval.ms 1000 How often to check the service.
ha.health-monitor.sleep-after-disconnect.ms 1000 How long to sleep after an unexpected RPC error.
ha.health-monitor.rpc-timeout.ms 45000 Timeout for the actual monitorHealth() calls.
ha.failover-controller.new-active.rpc-timeout.ms 60000 Timeout that the FC waits for the new active to become active
ha.failover-controller.graceful-fence.rpc-timeout.ms 5000 Timeout that the FC waits for the old active to go to standby
ha.failover-controller.graceful-fence.connection.retries 1 FC connection retries for graceful fencing
ha.failover-controller.cli-check.rpc-timeout.ms 20000 Timeout that the CLI (manual) FC waits for monitorHealth, getServiceState
ipc.client.fallback-to-simple-auth-allowed false When a client is configured to attempt a secure connection, but attempts to connect to an insecure server, that server may instruct the client to switch to SASL SIMPLE (unsecure) authentication. This setting controls whether or not the client will accept this instruction from the server. When false (the default), the client will not allow the fallback to SIMPLE authentication, and will abort the connection.
fs.client.resolve.remote.symlinks true Whether to resolve symlinks when accessing a remote Hadoop filesystem. Setting this to false causes an exception to be thrown upon encountering a symlink. This setting does not apply to local filesystems, which automatically resolve local symlinks.
nfs3.server.port 2049 Specify the port number used by Hadoop NFS.
nfs3.mountd.port 4242 Specify the port number used by Hadoop mount daemon.
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