存入HDFS有好幾種隱滾滑數據格式，我這里給備胡你列出一種格式的存儲，灶臘sequence的 public class SeqWrite {private static final String[] data = { "a,b,c,d,e,f,g", "h,i,j,k,l,m,n", "o,p,q,r,s,t", "u,v,w,x,y,z", "0,1,2,3,4", "5,6,7,8,9" };public
⑵ sqoop導入到HDFS怎麼都是java文件總結
運行一個maprece作業，該隱州作業會連接mysql資料庫並讀取歲禪表中的數據灶雀蔽，默認該作業會運行4個map任務來加速導入過程，每個任務都會將其導入的數據寫到一個單獨的文件，但所有4個文件都位於同一個目錄中。
codegen：生成源代碼，但並不執行導入操作
⑶ Sqoop工作原理是什麼
Sqoop是一款用於把關系型資料庫中的數據導入到hdfs中或者hive中的工具，當然也支持把數據從hdfs或者hive導入到關系型資料庫中。
Sqoop也是基於Maprece來做的數據導入。
關於sqoop的原理
sqoop的原理比較簡單，就是根據用戶指定的sql或者欄位參數，從資料庫中讀取數據導入到hive或者hdfs中。也支持基於資料庫導出工具導出，不陵槐御過受限於資料庫的版本。
在導出的過程中，sqoop會自動切分maprece任務。比如某個欄位的主鍵是從1到1000，那麼當設置num-mappers為2時，第一個mr任務會讀取1-500的數據，第二個mr任務會讀取500-1000的尺岩數據。如果是字元串還有其他的劃分方法.
關明沖於架構
sqoop目前有兩個大版本，第一個版本比較簡單，只能使用命令行
第二個版本引入了sqoop server，統一處理連接等信息，並提供多種連接方式，還引入了許可權控制，另外規范了連接的各項配置。
⑷ Sqoop的簡單使用案例
(配置sqoop家目錄環境變數,略)
驗證Sqoop連接MySQL:
bin/sqoop list-databases --connect jdbc:mysql://hadoop01:3306/ --username root --password root
1 導入數據
在Sqoop中，「導入」概念指：從非大數據集群（RDBMS）向大數據集群（HDFS，HIVE，HBASE）中傳輸數據，叫做：導入，即使用import關鍵字。
1.1 RDBMS到HDFS
1) 確定Mysql服務開啟正常
2) 在Mysql中新建一張表並插入一些數據
$ mysql -uroot -proot
create database company;
create table company.staff(id int(4) primary key not null auto_increment, name varchar(255), sex varchar(255));
insert into company.staff(name, sex) values('Thomas', 'Male');
insert into company.staff(name, sex) values('Catalina', 'FeMale');
select * from company;
3) 導入數據
（1）全部導入
$ bin/sqoop import \
--connect jdbc:mysql://hadoop01:3306/company \
--username root \
--password root \
--table staff \
--target-dir /user/company \
--delete-target-dir \
--num-mappers 1 \
--fields-terminated-by "\t"
（2）查詢導入
$ bin/sqoop import \
--connect jdbc:mysql://hadoop01:3306/衡配褲company \
--username root \
--password root \
--target-dir /user/company \
--delete-target-dir \
--num-mappers 1 \
--fields-terminated-by "\t" \
--query 'select name,sex from staff where id <=1 and $CONDITIONS;'
提示：must contain '$CONDITIONS'咐簡 in WHERE clause.
如果query後使用的是雙引號，則$CONDITIONS前必須加轉移符，防止shell識別為自己的變數。
（3）導入指定列
$ bin/sqoop import \
--connect jdbc:mysql://hadoop01:3306/company \
--username root \
--password root \
--target-dir /user/company \
--delete-target-dir \
--num-mappers 1 \
--fields-terminated-by "\t" \
--columns id,sex \
--table staff
提示：columns中如果涉及到多列，用逗號分隔，分隔時不要添加空格
（4）使用sqoop關鍵賣州字篩選查詢導入數據
$ bin/sqoop import \
--connect jdbc:mysql://hadoop01:3306/company \
--username root \
--password root \
--target-dir /user/company \
--delete-target-dir \
--num-mappers 1 \
--fields-terminated-by "\t" \
--table staff \
--where "id=1"
1.2 RDBMS到Hive
$ bin/sqoop import \
--connect jdbc:mysql://hadoop01:3306/company \
--username root \
--password root \
--table staff \
--num-mappers 1 \
--hive-import \
--fields-terminated-by "\t" \
--hive-overwrite \
--hive-table staff_hive
提示：該過程分為兩步，第一步將數據導入到HDFS，第二步將導入到HDFS的數據遷移到Hive倉庫，第一步默認的臨時目錄是/user/atguigu/表名
1.3 RDBMS到Hbase
$ bin/sqoop import \
--connect jdbc:mysql://hadoop01:3306/company \
--username root \
--password root \
--table company \
--columns "id,name,sex" \
--column-family "info" \
--hbase-create-table \
--hbase-row-key "id" \
--hbase-table "hbase_company" \
--num-mappers 1 \
--split-by id
提示：sqoop1. 6隻支持HBase1.0.1之前的版本的自動創建HBase表的功能
解決方案：手動創建HBase表
hbase> create 'hbase_company,'info'
(5) 在HBase中scan這張表得到如下內容
hbase> scan 『hbase_company』
2、導出數據
在Sqoop中，「導出」概念指：從大數據集群（HDFS，HIVE，HBASE）向非大數據集群（RDBMS）中傳輸數據，叫做：導出，即使用export關鍵字。
2.1 HIVE/HDFS到RDBMS
$ bin/sqoop export \
--connect jdbc:mysql://hadoop01:3306/company \
--username root \
--password root \
--table staff \
--num-mappers 1 \
--export-dir /user/hive/warehouse/staff_hive \
--input-fields-terminated-by "\t"
提示：Mysql中如果表不存在，不會自動創建
3 腳本打包
使用opt格式的文件打包sqoop命令，然後執行
1) 創建一個.opt文件
$ mkdir opt
$ touch opt/job_HDFS2RDBMS.opt
2) 編寫sqoop腳本
$ vi opt/job_HDFS2RDBMS.opt
export
--connect
jdbc:mysql://hadoop01:3306/company
--username
root
--password
root
--table
staff
--num-mappers
1
--export-dir
/user/hive/warehouse/staff_hive
--input-fields-terminated-by
"\t"
3) 執行該腳本
$ bin/sqoop --options-file opt/job_HDFS2RDBMS.opt
sqoop 配合集群使用:
創建連接MySQL密碼存放文件 並傳到HDFS中:
1.echo -n root > /usr/local/bin/sqoopPWD.pwd
2.hdfs dfs -put /usr/local/bin/sqoopPWD.pwd /user/hue/oozie/
3.sqoop job \
--create release_materiel \
-- import \
--connect jdbc:mysql://hd0:3306/throwads \
--username root \
--password-file /user/hue/oozie/sqoopPWD.pwd \
--table materiel \
--delete-target-dir \
--target-dir /gp1905/release/ods/release_materiel \
--fields-terminated-by '\001'
(注意-- import 有一個空格!!!)
⑸ sqoop2 1.99.7 java api 如何設置file format
//流讀入和寫入InputStreamin=null;//獲取HDFS的conf//讀取HDFS上的文件系統FileSystemhdfs=FileSystem.get(conf);//使用緩沖流，進行按行讀取的功能BufferedReaderbuff=null;//獲取日誌文件的根目錄Pathlistf=newPath("hdfs://10
⑹ sqoop支持java遠程操作么
Sqoop(發音：skup)是一款開源的工具，主要用於在Hadoop(Hive)與傳統的資料庫(mysql、postgresql...)間進行數據的傳遞，可以將一個關系型資料庫（例如 ： MySQL ,Oracle ,Postgres等）中的數據導進到Hadoop的HDFS中，也可以將HDFS的數據導進到關系型資料庫中。
Sqoop項目開始於2009年，最早是作為Hadoop的一個第三方模塊存在，後來為了讓使用者能夠快速部署，也為了讓開發人員能夠更快速的迭代開發，Sqoop獨立成為一個Apache項目。
⑺ sqoop導入到HDFS怎麼都是java文件總結
如下面這個shell腳本：
#Oracle的連接字元桐粗串，其鏈虧中包含了Oracle的地址，SID，和埠號
CONNECTURL=jdbc:oracle:thin:@20.135.60.21:1521:DWRAC2
#使用的用戶名
ORACLENAME=kkaa
#使用的密碼
ORACLEPASSWORD=kkaa123
#需要從Oracle中導入的表名
oralceTableName=tt
#需要從Oracle中導入的表中的欄位名
columns=AREA_ID,TEAM_NAME
#將Oracle中的數據導入到HDFS後的存放路徑
hdfsPath=apps/as/hive/$oralceTableName
#執行導入邏輯。將Oracle中的局喚鎮數據導入到HDFS中
sqoop import --append --connect $CONNECTURL --username $ORACLENAME --password $ORACLEPASSWORD --target-dir $hdfsPath --num-mappers 1 --table $oralceTableName --columns $columns --fields-terminated-by '\001'
執行這個腳本之後，導入程序就完成了。
⑻ sqoop Error returned by javac
運行sqoop從sqlservre抽數時報錯
Text.writeString(__dataOut, ContactPerson);
^
symbol: method writeString(DataOutput,String)
location: variable Text of type String
/tmp/sqoop-UsageDB/compile//QueryResult.java:1508: error: cannot find symbol
Text.writeString(__dataOut, ContactPersonTelephone);
^
symbol: method writeString(DataOutput,String)
location: variable Text of type String
/tmp/sqoop-UsageDB/compile//QueryResult.java:1514: error: cannot find symbol
Text.writeString(__dataOut, ContactPersonEmail);
^
symbol: method writeString(DataOutput,String)
location: variable Text of type String
/tmp/sqoop-UsageDB/compile//QueryResult.java:1520: error: cannot find symbol
Text.writeString(__dataOut, RequestorID);
^
symbol: method writeString(DataOutput,String)
location: variable Text of type String
/tmp/sqoop-UsageDB/compile//QueryResult.java:1526: error: cannot find symbol
Text.writeString(__dataOut, RequestorName);
^
symbol: method writeString(DataOutput,String)
location: variable Text of type String
/tmp/sqoop-UsageDB/compile//QueryResult.java:1532: error: cannot find symbol
Text.writeString(__dataOut, RequestorLogonname);
^
symbol: method writeString(DataOutput,String)
location: variable Text of type String
/tmp/sqoop-UsageDB/compile//QueryResult.java:1538: error: cannot find symbol
Text.writeString(__dataOut, RequestorCountry);
^
symbol: method writeString(DataOutput,String)
location: variable Text of type String
/tmp/sqoop-UsageDB/compile//QueryResult.java:1544: error: cannot find symbol
Text.writeString(__dataOut, RequestorTelephone);
^
symbol: method writeString(DataOutput,String)
location: variable Text of type String
/tmp/sqoop-UsageDB/compile//QueryResult.java:1550: error: cannot find symbol
Text.writeString(__dataOut, RequestorEmail);
^
symbol: method writeString(DataOutput,String)
location: variable Text of type String
/tmp/sqoop-UsageDB/compile//QueryResult.java:1556: error: cannot find symbol
Text.writeString(__dataOut, OperatorID);
^
symbol: method writeString(DataOutput,String)
location: variable Text of type String
/tmp/sqoop-UsageDB/compile//QueryResult.java:1562: error: cannot find symbol
Text.writeString(__dataOut, OperatorName);
^
symbol: method writeString(DataOutput,String)
location: variable Text of type String
/tmp/sqoop-UsageDB/compile//QueryResult.java:1568: error: cannot find symbol
Text.writeString(__dataOut, OperatorLogonName);
^
symbol: method writeString(DataOutput,String)
location: variable Text of type String
/tmp/sqoop-UsageDB/compile//QueryResult.java:1574: error: cannot find symbol
Text.writeString(__dataOut, Country);
^
symbol: method writeString(DataOutput,String)
location: variable Text of type String
/tmp/sqoop-UsageDB/compile//QueryResult.java:1580: error: cannot find symbol
Text.writeString(__dataOut, CompanyCode);
^
symbol: method writeString(DataOutput,String)
location: variable Text of type String
/tmp/sqoop-UsageDB/compile//QueryResult.java:1593: error: cannot find symbol
Text.writeString(__dataOut, NonPoPurchaseCategory);
^
symbol: method writeString(DataOutput,String)
location: variable Text of type String
/tmp/sqoop-UsageDB/compile//QueryResult.java:1599: error: cannot find symbol
Text.writeString(__dataOut, CategoryRemark);
^
symbol: method writeString(DataOutput,String)
location: variable Text of type String
/tmp/sqoop-UsageDB/compile//QueryResult.java:1605: error: cannot find symbol
Text.writeString(__dataOut, ContractNumber);
^
symbol: method writeString(DataOutput,String)
location: variable Text of type String
/tmp/sqoop-UsageDB/compile//QueryResult.java:1611: error: cannot find symbol
Text.writeString(__dataOut, Currency);
^
symbol: method writeString(DataOutput,String)
location: variable Text of type String
/tmp/sqoop-UsageDB/compile//QueryResult.java:1630: error: cannot find symbol
Text.writeString(__dataOut, PayingBankAccountNumber);
^
symbol: method writeString(DataOutput,String)
location: variable Text of type String
/tmp/sqoop-UsageDB/compile//QueryResult.java:1636: error: cannot find symbol
Text.writeString(__dataOut, CheckToRequestorName);
^
symbol: method writeString(DataOutput,String)
location: variable Text of type String
/tmp/sqoop-UsageDB/compile//QueryResult.java:1642: error: cannot find symbol
Text.writeString(__dataOut, CheckToRequestorTelephone);
^
symbol: method writeString(DataOutput,String)
location: variable Text of type String
/tmp/sqoop-UsageDB/compile//QueryResult.java:1648: error: cannot find symbol
Text.writeString(__dataOut, BankConfirmationMail);
^
symbol: method writeString(DataOutput,String)
location: variable Text of type String
/tmp/sqoop-UsageDB/compile//QueryResult.java:1654: error: cannot find symbol
Text.writeString(__dataOut, BeneficiaryName);
^
symbol: method writeString(DataOutput,String)
location: variable Text of type String
/tmp/sqoop-UsageDB/compile//QueryResult.java:1660: error: cannot find symbol
Text.writeString(__dataOut, BeneficiaryAddress);
^
symbol: method writeString(DataOutput,String)
location: variable Text of type String
/tmp/sqoop-UsageDB/compile//QueryResult.java:1666: error: cannot find symbol
Text.writeString(__dataOut, BeneficiaryBankName);
^
symbol: method writeString(DataOutput,String)
location: variable Text of type String
/tmp/sqoop-UsageDB/compile//QueryResult.java:1672: error: cannot find symbol
Text.writeString(__dataOut, BankAccountNumber);
^
symbol: method writeString(DataOutput,String)
location: variable Text of type String
/tmp/sqoop-UsageDB/compile//QueryResult.java:1678: error: cannot find symbol
Text.writeString(__dataOut, BankCode);
^
symbol: method writeString(DataOutput,String)
location: variable Text of type String
/tmp/sqoop-UsageDB/compile//QueryResult.java:1684: error: cannot find symbol
Text.writeString(__dataOut, TaxID);
^
symbol: method writeString(DataOutput,String)
location: variable Text of type String
/tmp/sqoop-UsageDB/compile//QueryResult.java:1738: error: cannot find symbol
Text.writeString(__dataOut, PaymentfileNumber);
^
symbol: method writeString(DataOutput,String)
location: variable Text of type String
/tmp/sqoop-UsageDB/compile//QueryResult.java:1751: error: cannot find symbol
Text.writeString(__dataOut, Remark);
^
symbol: method writeString(DataOutput,String)
location: variable Text of type String
/tmp/sqoop-UsageDB/compile//QueryResult.java:1770: error: cannot find symbol
Text.writeString(__dataOut, PONo);
^
symbol: method writeString(DataOutput,String)
location: variable Text of type String
/tmp/sqoop-UsageDB/compile//QueryResult.java:1776: error: cannot find symbol
Text.writeString(__dataOut, GEO);
^
symbol: method writeString(DataOutput,String)
location: variable Text of type String
/tmp/sqoop-UsageDB/compile//QueryResult.java:1782: error: cannot find symbol
Text.writeString(__dataOut, SID);
^
symbol: method writeString(DataOutput,String)
location: variable Text of type String
/tmp/sqoop-UsageDB/compile//QueryResult.java:1788: error: cannot find symbol
Text.writeString(__dataOut, UMSAttachments);
^
symbol: method writeString(DataOutput,String)
location: variable Text of type String
/tmp/sqoop-UsageDB/compile//QueryResult.java:1794: error: cannot find symbol
Text.writeString(__dataOut, TaxJurisdictionReport);
^
symbol: method writeString(DataOutput,String)
location: variable Text of type String
/tmp/sqoop-UsageDB/compile//QueryResult.java:1800: error: cannot find symbol
Text.writeString(__dataOut, DectableTaxCostCenter);
^
symbol: method writeString(DataOutput,String)
location: variable Text of type String
/tmp/sqoop-UsageDB/compile//QueryResult.java:1806: error: cannot find symbol
Text.writeString(__dataOut, ServiceTax);
^
symbol: method writeString(DataOutput,String)
location: variable Text of type String
/tmp/sqoop-UsageDB/compile//QueryResult.java:1812: error: cannot find symbol
Text.writeString(__dataOut, ServiceTaxAccount);
^
symbol: method writeString(DataOutput,String)
location: variable Text of type String
/tmp/sqoop-UsageDB/compile//QueryResult.java:1818: error: cannot find symbol
Text.writeString(__dataOut, ServiceTaxCode);
^
symbol: method writeString(DataOutput,String)
location: variable Text of type String
/tmp/sqoop-UsageDB/compile//QueryResult.java:1824: error: cannot find symbol
Text.writeString(__dataOut, Assignment);
^
symbol: method writeString(DataOutput,String)
location: variable Text of type String
/tmp/sqoop-UsageDB/compile//QueryResult.java:1830: error: cannot find symbol
Text.writeString(__dataOut, Text);
^
symbol: method writeString(DataOutput,String)
location: variable Text of type String
/tmp/sqoop-UsageDB/compile//QueryResult.java:1838: error: cannot find symbol
Text.writeString(__dataOut, ID);
^
symbol: method writeString(DataOutput,String)
location: variable Text of type String
/tmp/sqoop-UsageDB/compile//QueryResult.java:1844: error: cannot find symbol
Text.writeString(__dataOut, Subject);
^
symbol: method writeString(DataOutput,String)
location: variable Text of type String
/tmp/sqoop-UsageDB/compile//QueryResult.java:1850: error: cannot find symbol
Text.writeString(__dataOut, TicketNumber);
^
symbol: method writeString(DataOutput,String)
location: variable Text of type String
/tmp/sqoop-UsageDB/compile//QueryResult.java:1856: error: cannot find symbol
Text.writeString(__dataOut, VendorID);
^
symbol: method writeString(DataOutput,String)
location: variable Text of type String
Note: /tmp/sqoop-UsageDB/compile//QueryResult.java uses or overrides a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
100 errors
2019-06-27 19:10:40,977 ERROR [main] tool.ImportTool (ImportTool.java:run(609)) - Encountered IOException running import job: java.io.IOException: Error returned by javac
at org.apache.sqoop.orm.CompilationManager.compile(CompilationManager.java:217)
at org.apache.sqoop.tool.CodeGenTool.generateORM(CodeGenTool.java:97)
at org.apache.sqoop.tool.ImportTool.importTable(ImportTool.java:478)
at org.apache.sqoop.tool.ImportTool.run(ImportTool.java:601)
at org.apache.sqoop.Sqoop.run(Sqoop.java:143)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)
at org.apache.sqoop.Sqoop.runSqoop(Sqoop.java:179)
at org.apache.sqoop.Sqoop.runTool(Sqoop.java:218)
at org.apache.sqoop.Sqoop.runTool(Sqoop.java:227)
at org.apache.sqoop.Sqoop.main(Sqoop.java:236)
對應的是sqlserver FIle table;沒辦法指定--table.
網上查到說指定字元，就去檢查下下字元，檢查到原因時目標表中有列欄位名叫Text,在抽數時將這個欄位去掉了。
更改後如下
⑼ sqoop命令使用jar包,jar應該放哪個目錄下
1，rmdbs to hadoop 很簡單，使用一條命令 sqoop import --jar-file （你吵喊的jar包） --class-name （classname） --connect （mysql實友碰御例） --username （用戶名） --password （密碼） -table （表名） -hbase-table （hbase表名好岩） -column-famil...
⑽ sqoop導入到HDFS怎麼都是java文件總結
您好，我看到您的問題很久沒有人來回答，但是問題過期無人回答會被扣分的並且你的懸賞分也會被沒收！所以我給你提幾條建議：
一，你可以選擇在正確的分類下去提問，這樣知道你問題答案的人才會多一些，回答的人也會多些。
二，您可以到與您問題相關專業網站論壇里去看看，那裡聚集悉攜了許多專業人才，一定可以為你解決問題的。
三，你可以向你的網上好襲陸慧友問友打聽，他們會更加真誠熱心為你尋找答案的，甚至可以到相關網站直接搜索.
四，網上很多專業論壇以及知識平台，上面也有很多資料，我遇到專業性的問題總是上論壇求解決辦法的。
五，將你的問題問的細一些，清楚一些！讓人更加容易看懂明白是什麼意思!
謝謝拍答採納我的建議! !