hdfs big data

Label:Recently in the use of sqoop1.99.6 to do data extraction, during the encounter a lot of problems, hereby recorded here, convenient for later review and collation 1. First configuration, you need to configure the Lib directory of HDFs to Catalina.properties Common.loader=${catalina.base}/lib,${catalina.base}/lib/*.jar,${catalina.home}/lib,${catalina.home}/lib/*.jar, ${catalina.home}/. /lib/*.jar,/usr/l

Reprint Please specify source: Hadoop in-depth study: (vi)--HDFS data integrityData IntegrityDuring IO operation, data loss or dirty data is unavoidable, and the higher the data transfer rate, the higher the probability of error. The most common way to verify errors is to ca

Http://www.cognoschina.net/club/thread-66425-1-1.html for reference only "Automatic Big Data Mining" is the true significance of big data. Nowadays, big data cannot work very well. Almost everyone is talking about

Label:Questions Guide: 1 、--function of the Connect parameter?2. Which parameter is used to read the database access password from the console?3, Sqoop the relational database table data into the HDFS basic parameters requirements and commands?4. The data is imported by default to the path in the HDFs file system?5 、--

First, using Sqoop to import data from MySQL into the hdfs/hive/hbaseIi. using Sqoop to export data from hdfs/hive/hbase to MySQL 2.3 NBSP; hbase data exported to MySQL There is no immediate command to direct data from HBase

http://blog.csdn.net/jiangshouzhuang/article/details/51290399Kylin generates intermediate data on HDFS during the cube creation process. Also, when we execute purge/drop/merge on cube, some hbase tables may remain in hbase, and the tables are no longer queried, although Kylin does some automatic garbage collection, but it may not overwrite all aspects, So we need to be able to do some cleanup work for offli

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On-line websites generate log data every day. If there is a requirement: Log files generated by the day before the start of the operation at 24 o'clock in the morning are expected to be uploaded to the HDFS cluster in real time. How to do it? Can I implement a recurring upload requirement after implementation? How to schedule? Linux crontab::Crontab-e0 0 * * */shell/uploadfile2hdfs.sh//Daily 12:00I

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1. Requirements :HDFs cannot upload files due to 99% occupancy on disk where Hadoop data files reside Exception : Org.apache.hadoop.ipc.remoteexception:java.io.ioexception:file/user/root/input could only being replicated to 0 nodes, instead of 1[Email protected] hadoop]# df-hFilesystem Size used Avail use% mounted on/dev/mapper/vg_greenbigdata4-lv_root50G 49.2G 880M 99%/Tmpfs 7.8G 0 7.8G 0%/dev/shm/DEV/SDA

Basic Linux Tutorial: Use awk to delete data before the specified date in hdfs Business backgroundIt is agreed that the HDFS data five days ago is the expired version data, and an awk script is written to automatically delete the expired version

Tags: file uri ora shel ACL created address multiple arcBasic useAs in the shell script below: #Oracle的连接字符串, which contains the Oracle's address, SID, and port numberConnecturl=jdbc:oracle:thin:@20.135.60.21:1521:dwrac2#使用的用户名Oraclename=kkaa#使用的密码Oraclepassword=kkaa123#需要从Oracle中导入的表名Oralcetablename=tt#需要从Oracle中导入的表中的字段名Columns=area_id,team_name#将Oracle中的数据导入到HDFS后的存放路径hdfspath=apps/as/hive/$oralceTableName#执行导入逻辑. Importing

Through the Java direct reading HDFs, will certainly use the Fsdatainputstream class, through the Fsdatainputstream in the form of streaming from the HDFs reads the data code as follows: Import java.io.IOException; Import Java.net.URI; Import org.apache.hadoop.conf.Configuration; Import Org.apache.hadoop.fs.FSDataInputStream; Import Org.apache.hadoop.fs.FileSyst

Hdfs:hadoop Distributed File System It abstracts the storage resources of the entire cluster and can hold large files. The file uses the design of the chunked storage replication. The default size of the block is 64M. Streaming data access, one write (now supports append), multiple reads. Unsuitable aspects: Low-latency data access Solution: HBASE A large number of sm

The best number of column families should be one or two, should not exceed 3 No limit on the number of labels Data is stored as binary in HBase (hbase more like a data management system, where data is stored in HDFs, similar to DB2 and Oracle, where relational database data