Hadoop configuration Item Grooming (core-site.xml)

Record the configuration and description of Hadoop, and use the new configuration items to be replenished and updated on a regular basis. Divide by Profile Name

Take the Hadoop 1.x configuration as an example

Core-site.xml

Name	Value	Description
Fs.default.name	hdfs://hadoopmaster:9000	Defines the URI and port of the Hadoopmaster
Fs.checkpoint.dir	/opt/data/hadoop1/hdfs/namesecondary1	Define the path to the name backup of Hadoop, the official document says read this, write Dfs.name.dir
Fs.checkpoint.period	1800	Defines the backup interval for name backup, in seconds, only for SNN, and the default one hour
Fs.checkpoint.size	33554432	Backup interval at log size interval, only valid for SNN, default 64M
Io.compression.codecs	Org.apache.hadoop.io.compress.DefaultCodec, Com.hadoop.compression.lzo.LzoCodec, Com.hadoop.compression.lzo.LzopCodec, Org.apache.hadoop.io.compress.GzipCodec, Org.apache.hadoop.io.compress.BZip2Codec (Layout adjustment, actual configuration do not enter)	The codecs used by Hadoop, Gzip and bzip2 are self-contained, Lzo need to be installed HADOOPGPL or kevinweil, comma separated, snappy also need to be installed separately
Io.compression.codec.lzo.class	Com.hadoop.compression.lzo.LzoCodec	Compression encoder used by the Lzo
Topology.script.file.name	/hadoop/bin/rackaware.py	Rack-Aware Scripting location
Topology.script.number.args	1000	The number of hosts that the rack-aware script manages, the IP address
Fs.trash.interval	10800	HDFs dumpster settings, can be recovered by mistake deletion, number of minutes, 0 is disabled, add this item without restarting Hadoop
Hadoop.http.filter.initializers	Org.apache.hadoop.security. Authenticationfilterinitializer (Layout adjustment, actual configuration do not enter)	Need Jobtracker,tasktracker Namenode,datanode, such as HTTP access port user authentication use, need to configure all nodes
Hadoop.http.authentication.type	Simple | Kerberos | #AUTHENTICATION_HANDLER_CLASSNAME #	authentication method, default is simple, can also define class, need to configure all nodes
Hadoop.http.authentication. Token.validity (Layout adjustment, actual configuration do not enter)	36000	To validate the token's effective time, configure all nodes
Hadoop.http.authentication. Signature.secret (Layout adjustment, actual configuration do not enter)	Default do not write parameters	Default does not write automatically generate private signatures when Hadoop starts, all nodes need to be configured
Hadoop.http.authentication.cookie.domain	Domian.tld	HTTP authentication is used by the domain name of the cookie, IP address access is not valid, you must configure the domain name for all nodes.
Hadoop.http.authentication. Simple.anonymous.allowed (Layout adjustment, actual configuration do not enter)	true | False	Simple authentication private, default Allow anonymous access, true
Hadoop.http.authentication. Kerberos.principal (Layout adjustment, actual configuration do not enter)	http/localhost@ $LOCALHOST	Kerberos authentication dedicated, certified entity machines must use HTTP as the name of K
Hadoop.http.authentication. Kerberos.keytab (Layout adjustment, actual configuration do not enter)	/home/xianglei/hadoop.keytab	Kerberos authentication private, key file storage location
Hadoop.security.authorization	True|false	Hadoop Service level verification security verification, with Hadoop-policy.xml, configured to use Dfsadmin,mradmin-refreshserviceacl refresh in effect
Io.file.buffer.size	131072	The size of the read-write buffer used as a serialized file processing
Hadoop.security.authentication	Simple | Kerberos	Permission validation for Hadoop itself, non-HTTP access, simple or Kerberos
Hadoop.logfile.size	1000000000	Set the log file size to scroll the new log more than
Hadoop.logfile.count	20	Maximum number of logs
Io.bytes.per.checksum	1024	The number of bytes verified per checksum, not greater than io.file.buffer.size
Io.skip.checksum.errors	true | False	Skipping checksum error while processing serialized file, do not throw exception. False by default
Io.serializations	Org.apache.hadoop.io. Serializer. Writableserialization (Layout required.) Actual configuration do not enter)	Serialized codecs
Io.seqfile.compress.blocksize	1024000	Minimum block size of the serialized file for block compression, bytes
Webinterface.private.actions	true | False	Set to True, the tracker Web page of JT and NN will appear to kill the task to delete files such as Operation connection, default is False

Combined with the Apache manual and the actual configuration used in the company, according to the actual hardware configuration, the parameter size needs to be adjusted, the current parameters are based on Namenode 96G memory, Datanode 32G memory. Some har,s3,local such as FS implement because it is not very likely to use, so did not write.

The level is limited, the parameter description understanding or translation error forgive.

This article is from the "Practice Test Truth" blog, declined reproduced.