hadoop2

问题 I have created two hive scripts script1.hql and script2.hql. Is it possible to run the script script2.hql from script1.hql? I read about using the source command, but could not get around about its use. Any pointers/ref docs will be appreciated.. 回答1: Use source <filepath> command: source /tmp/script2.hql; --inside script1 The docs are here: https://cwiki.apache.org/confluence/display/Hive/LanguageManual+Cli Hive will include text of /tmp/script2.hql and execute it in the same context, so all

问题 Using WEBHDFS REST API calls can i transfer or copy the files from Windows machine(i.e. windows server or windows local folder or desktop) to Hadoop-HDFS file system? If yes any sample command info? I have tried and i was able to do using Windows->(using ftp)-> Linux directory -> (using webhdfs) -> HDFS and this is two step process and i am looking for one step process directly from Windows -> (webhdfs) -> HDFS. I referred in https://hadoop.apache.org/docs/r1.0.4/webhdfs.html for helpful info

问题 How are software/hardware failures handled in YARN? Specifically, what happens in case of container(s) failure/crash? 回答1: Container and task failures are handled by node-manager. When a container fails or dies, node-manager detects the failure event and launches a new container to replace the failing container and restart the task execution in the new container. In the event of application-master failure, the resource-manager detects the failure and start a new instance of the application

问题 I am using Hadoop streaming JAR for WordCount , I want to know how can I get Globally Sort , according to answer on another question in SO, I found that when we use of just one reducer we can get Globally sort but in my result with numReduceTasks=1 (one reducer) it is not sort. For example, my input to mapper is: file 1: A long time ago in a galaxy far far away file 2: Another episode for Star Wars Result is: A 1 a 1 Star 1 ago 1 for 1 far 2 away 1 time 1 Wars 1 long 1 Another 1 in 1 episode

问题 I want to use testmapredsort for benchmarking sort in Hadoop. I am NOT using TeraSort now. hadoop-*test*.jar is supposed to contain the testmapredsort class. But I do not see hadoop-*test*.jar in Hadoop2 . hadoop jar hadoop/share/hadoop/common/hadoop-common-2.2.0-tests.jar testmapredsort /data/unsorted-data -sortOutput /data/sorted-data 回答1: In Hadoop 1, testmapredsort is launched from AllTestDriver.java , which was indeed in e.g. hadoop-test-1.2.1.jar . In Hadoop 2, it's now in

问题 I am trying to benchmark Hadoop2 MapReduce framework. It is NOT TeraSort. But testmapredsort . step-1 Create random data: hadoop jar hadoop/ randomwriter -Dtest.randomwrite.bytes_per_map=100 -Dtest.randomwriter.maps_per_host=10 /data/unsorted-data step-2 sort the random data created in step-1: hadoop jar hadoop/share/hadoop/mapreduce/hadoop-mapreduce-examples-2.2.0.jar sort /data/unsorted-data /data/sorted-data step-3 check if the sorting by MR works: hadoop jar hadoop/share/hadoop/mapreduce

问题 I have a jar in which one MapReduce class works fine while the other class with same structure - proper use of Tool, use of getConf(), etc. - fails with error 'Found interface org.apache.hadoop.mapreduce.jobcontext but class expected'. Any specific places that I should look for to fix this? Just about any help/clue would be great! Edit: Other people with the same issue (no answer as yet on that thread either): https://groups.google.com/forum/#!msg/hipi-users/LSvktkk1YdI/yssjjc7cjeIJ 回答1: you

问题 I have installed Hadoop 2.3.0 and able to execute MR jobs successfully. But when I trying to execute MR jobs in normal privilege (without admin privilege) means job get fails with following exception. I tried "WordCount.jar" sample. 14/10/28 09:16:12 INFO mapreduce.Job: Task Id : attempt_1414467725299_0002_r_000 000_1, Status : FAILED Error: java.lang.NullPointerException at org.apache.hadoop.mapred.Task.getFsStatistics(Task.java:347) at org.apache.hadoop.mapred.ReduceTask

问题 This question already has answers here : Write to multiple outputs by key Spark - one Spark job (10 answers) Closed last year . Basically i need to create output file based on the DataPartition column.Last column in the data frame So First row and last row will be saved in Fundamental.Fundamental.Fundamental.Japan.1.2018-09-24-0937.Full.txt and middle row will be saved in Fundamental.Fundamental.Fundamental.ThirdParty.1.2018-09-24-0937.Full.txt +--------------------------------+--------------

问题 I have a main table (Employee) which is having 10 columns and I can load data into it using load data inpath /file1.txt into table Employee My question is how to handle the same table (Employee) if my file file2.txt has same columns but column 3 and columns 5 are missing. if I directly load data last columns will be NULL NULL . but instead it should load 3rd as NULL and 5th column as NULL. Suppose I have a table Employee and I want to load the file1.txt and file2.txt to table. file1.txt =====