data ingestion in hadoop

Annual_customer_segment_fact table to confirm that the initial load was successful.Select A.customer_sk CSK, a.year_sk Ysk, Annual_order_amount amt, segment_name sn, band_name bn From Annual_customer_segment_fact A, Annual_order_segment_dim B, Year_dim C, annual_sales_order_fact D where A.segment_sk = B.segment_sk and A.year_sk = C.year_sk and A.customer_sk = D.customer_sk and A.year_sk = D.year_skcluster by CSK, Ysk, Sn, BN;The query results are

Start learning about Hadoop's popular database technology today. Get started directly from Hadoop's definitive guide 4th Edition, which is a Hadoop Bible. In the first chapter, the author writes about two methods of distributing database system in processing data segmentation: 1) According to a certain unit (such as year or value range), 2) divide all data evenly

1. sentiment how your customers feelUnderstand how your Coustomer feel on your brand and products right now.2. clickstream Website Visitors ' dataCapture and analyze website visitors ' data trails and optimize your website.3. sensor/machine Data from remote sensors and machinesDiscover patterns in data streaming automatically from remote sensors and machines.4. G

Error:org.apache.hadoop.mapreduce.task.reduce.shuffle$shuffleerror:error in Shuffle in fetcher#43 At Org.apache.hadoop.mapreduce.task.reduce.Shuffle.run (shuffle.java:134) At Org.apache.hadoop.mapred.ReduceTask.run (reducetask.java:376) At Org.apache.hadoop.mapred.yarnchild$2.run (yarnchild.java:167) At java.security.AccessController.doPrivileged (Native Method) At javax.security.auth.Subject.doAs (subject.java:396) At org.apache.hadoop.security.UserGroupInfor

= Mapstringvalue + station[1] +"-"; }Else{mapNewHashmap""; Tempday = day; Mapstringvalue + = station[1] +"-"; } }Catch(ParseException e) {E.printstacktrace (); } }//System.out.println ("list =" + List.size ());mapNewHashmap""; }//System.out.println ("list.get (0) =" + list.get (0));//System.out.println ("list.get (1) =" + list.get (1)); if(list.size () = = 0) {System. out. println ("Remove

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I. Job input and output optimizationUse Muti-insert, union All, the union all of the different tables equals multiple inputs, union all of the same table, quite map outputExample　　Second, data tailoring2.1. Column ClippingWhen hive reads the data, it can query only the columns that are needed, ignoring the other columns. You can even use an expression that is being expressed.See. Http://www.cnblogs.com/bjlh

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-scm-agent# for a in {1..6}; Do ssh enc-bigdata0$a/opt/cm-5.8.0/etc/init.d/cloudera-scm-agent start; Done6. Problem: Cloudera-scm-agent failed to start: Unable to create the PidfileReason: Unable to create/opt/cm-5.8.0/run/cloudera-scm-agentWorkaround:# mkdir/opt/cm-5.8.0/run/cloudera-scm-agent# Chown-r Cloudera-scm:cloudera-scm/opt/cm-5.8.0/run/cloudera-scm-agent7. Access URL: http://IP:7180/(configuration CDH5.8.0)enc-bigdata0[1-6].enc.cn # #点击模式Note: It is important to modify the JDK home dir

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