(r, s] rffdyj
(r, s] rffdyj
(r, s] rea
(r, s] rea
(r, s] s
(r, s] s
(r, s] rdchi
(r, s] rdchi
(r, s] rnzrb
(r, s] rnzrb
(r, s] rkjxzpwd
(r, s] rkjxzpwd
(r, s] rlzrxxra
(r, s] rlzrxxra
(r, s] rmf
(r, s] rmf
(r, s] rlg
(r, s] rlg
(r, s] rjpogqj
(r, s] rjpogqj
(r, s] rnviy
(r, s] rnviy
(r, s] rcigwg
(r, s] rcigwg
(r, s] rodg
(r, s] rodg
(r, s] rvwvkfhn
(r, s] rvwvkfhn
(r, s] ric
(r, s] ric
(r, s] rwl
(r, s] rwl
(r, s] rozd
(r, s] rozd
(r, s] rvw
(r, s] rvw
(r, s] rsz
(r, s] rsz
(r, s] roppn
(r, s] roppn
(r, s] ruzuy
(r, s] ruzuy
(r, s] rxgo
(r, s] rxgo
(r, s] rhhiefr
(r, s] rhhiefr
(r, s] rsfds
(r, s] rsfds
(r, s] rimaj
(r, s] rimaj
(r, s] rtdao
(r, s] rtdao
(r, s] rwnwj
(r, s] rwnwj
(r, s] rdbyizmt
(r, s] rdbyizmt
(r, s] rbxunbvn
(r, s] rbxunbvn
(r, s] rfwvfzs
(r, s] rfwvfzs
(r, s] rrhsitdf
(r, s] rrhsitdf
(r, s] rbvrh
(r, s] rbvrh
(r, s] rrsutcxg
(r, s] rrsutcxg
(r, s] rvkds
(r, s] rvkds
(r, s] rqmw
(r, s] rqmw
(r, s] rpswp
(r, s] rpswp
(r, s] rgmabb
(r, s] rgmabb
(r, s] relvjbcz
(r, s] relvjbcz
(r, s] rumtmik
(r, s] rumtmik
(r, s] rmgtvs
(r, s] rmgtvs
(r, s] ryvyt
(r, s] ryvyt
(r, s] rjlyen
(r, s] rjlyen
(r, s] rrbl
(r, s] rrbl
(r, s] rmxyecr
(r, s] rmxyecr
(r, s] rjzeu
(r, s] rjzeu
(r, s] rslqhmp
(r, s] rslqhmp
(r, s] rvgv
(r, s] rvgv
(r, s] rfbccyfp
(r, s] rfbccyfp
(r, s] rnktca
(r, s] rnktca
(r, s] rlcjeafa
(r, s] rlcjeafa
(r, s] rjcfdka
(r, s] rjcfdka
(r, s] rjmoex
(r, s] rjmoex
(r, s] rgoe
(r, s] rgoe
(r, s] rtllnzc
(r, s] rtllnzc
(r, s] rbdwbhl
(r, s] rbdwbhl
(r, s] rvkohgf
(r, s] rvkohgf
(r, s] rr
(r, s] rr
(r, s] rq
(r, s] rq
(r, s] rp
(r, s] rp
(r, s] rm
(r, s] rm
(r, s] rl
(r, s] rl
(r, s] rk
(r, s] rk
(r, s] rj
(r, s] rj
(r, s] re
(r, s] re
(r, s] rd
(r, s] rd
(r, s] ra
(r, s] ra
(r, s] rebdkgtr
(r, s] rebdkgtr
(r, s] rbmnele
(r, s] rbmnele
(r, s] rrsiv
(r, s] rrsiv
(r, s] rjtvn
(r, s] rjtvn
(r, s] rffdyj
(r, s] rffdyj
(r, s] rea
(r, s] rea
(r, s] s
(r, s] s
(r, s] rdchi
(r, s] rdchi
(r, s] rnzrb
(r, s] rnzrb
(r, s] rkjxzpwd
(r, s] rkjxzpwd
(r, s] rlzrxxra
(r, s] rlzrxxra
(r, s] rmf
(r, s] rmf
(r, s] rlg
(r, s] rlg
(r, s] rjpogqj
(r, s] rjpogqj
(r, s] rnviy
(r, s] rnviy
(r, s] rcigwg
(r, s] rcigwg
(r, s] rodg
(r, s] rodg
(r, s] rvwvkfhn
(r, s] rvwvkfhn
(r, s] ric
(r, s] ric
(r, s] rwl
(r, s] rwl
(r, s] rozd
(r, s] rozd
(r, s] rvw
(r, s] rvw
(r, s] rsz
(r, s] rsz
(r, s] roppn
(r, s] roppn
(r, s] ruzuy
(r, s] ruzuy
(r, s] rxgo
(r, s] rxgo
(r, s] rhhiefr
(r, s] rhhiefr
(r, s] rsfds
(r, s] rsfds
(r, s] rimaj
(r, s] rimaj
(r, s] rtdao
(r, s] rtdao
(r, s] rwnwj
(r, s] rwnwj
(r, s] rdbyizmt
(r, s] rdbyizmt
(r, s] rbxunbvn
(r, s] rbxunbvn
(r, s] rfwvfzs
(r, s] rfwvfzs
(r, s] rrhsitdf
(r, s] rrhsitdf
(r, s] rbvrh
(r, s] rbvrh
(r, s] rrsutcxg
(r, s] rrsutcxg
(r, s] rvkds
(r, s] rvkds
(r, s] rqmw
(r, s] rqmw
(r, s] rpswp
(r, s] rpswp
(r, s] rgmabb
(r, s] rgmabb
(r, s] relvjbcz
(r, s] relvjbcz
(r, s] rumtmik
(r, s] rumtmik
(r, s] rmgtvs
(r, s] rmgtvs
(r, s] ryvyt
(r, s] ryvyt
(r, s] rjlyen
(r, s] rjlyen
(r, s] rrbl
(r, s] rrbl
(r, s] rmxyecr
(r, s] rmxyecr
(r, s] rjzeu
(r, s] rjzeu
(r, s] rslqhmp
(r, s] rslqhmp
(r, s] rvgv
(r, s] rvgv
(r, s] rfbccyfp
(r, s] rfbccyfp
(r, s] rnktca
(r, s] rnktca
(r, s] rlcjeafa
(r, s] rlcjeafa
(r, s] rjcfdka
(r, s] rjcfdka
(r, s] rjmoex
(r, s] rjmoex
(r, s] rgoe
(r, s] rgoe
(r, s] rtllnzc
(r, s] rtllnzc
(r, s] rbdwbhl
(r, s] rbdwbhl
(r, s] rvkohgf
(r, s] rvkohgf
(r, s] rr
(r, s] rr
(r, s] rq
(r, s] rq
(r, s] rp
(r, s] rp
(r, s] rm
(r, s] rm
(r, s] rl
(r, s] rl
(r, s] rk
(r, s] rk
(r, s] rj
(r, s] rj
(r, s] re
(r, s] re
(r, s] rd
(r, s] rd
(r, s] ra
(r, s] ra
(r, s] rebdkgtr
(r, s] rebdkgtr
(r, s] rbmnele
(r, s] rbmnele
(r, s] rrsiv
(r, s] rrsiv
(r, s] rjtvn
(r, s] rjtvn
(r, s] rffdyj
(r, s] rffdyj
(r, s] rea
(r, s] rea
(r, s] s
(r, s] s
(r, s] rdchi
(r, s] rdchi
(r, s] rnzrb
(r, s] rnzrb
(r, s] rkjxzpwd
(r, s] rkjxzpwd
(r, s] rlzrxxra
(r, s] rlzrxxra
(r, s] rmf
(r, s] rmf
(r, s] rlg
(r, s] rlg
(r, s] rjpogqj
(r, s] rjpogqj
(r, s] rnviy
(r, s] rnviy
(r, s] rcigwg
(r, s] rcigwg
(r, s] rodg
(r, s] rodg
(r, s] rvwvkfhn
(r, s] rvwvkfhn
(r, s] ric
(r, s] ric
(r, s] rwl
(r, s] rwl
(r, s] rozd
(r, s] rozd
(r, s] rvw
(r, s] rvw
(r, s] rsz
(r, s] rsz
(r, s] roppn
(r, s] roppn
(r, s] ruzuy
(r, s] ruzuy
(r, s] rxgo
(r, s] rxgo
(r, s] rhhiefr
(r, s] rhhiefr
(r, s] rsfds
(r, s] rsfds
(r, s] rimaj
(r, s] rimaj
(r, s] rtdao
(r, s] rtdao
(r, s] rwnwj
(r, s] rwnwj
(r, s] rdbyizmt
(r, s] rdbyizmt
(r, s] rbxunbvn
(r, s] rbxunbvn
(r, s] rfwvfzs
(r, s] rfwvfzs
(r, s] rrhsitdf
(r, s] rrhsitdf
(r, s] rbvrh
(r, s] rbvrh
(r, s] rrsutcxg
(r, s] rrsutcxg
(r, s] rvkds
(r, s] rvkds
(r, s] rqmw
(r, s] rqmw
(r, s] rpswp
(r, s] rpswp
(r, s] rgmabb
(r, s] rgmabb
(r, s] relvjbcz
(r, s] relvjbcz
(r, s] rumtmik
(r, s] rumtmik
(r, s] rmgtvs
(r, s] rmgtvs
(r, s] ryvyt
(r, s] ryvyt
(r, s] rjlyen
(r, s] rjlyen
(r, s] rrbl
(r, s] rrbl
(r, s] rmxyecr
(r, s] rmxyecr
(r, s] rjzeu
(r, s] rjzeu
(r, s] rslqhmp
(r, s] rslqhmp
(r, s] rvgv
(r, s] rvgv
(r, s] rfbccyfp
(r, s] rfbccyfp
(r, s] rnktca
(r, s] rnktca
(r, s] rlcjeafa
(r, s] rlcjeafa
(r, s] rjcfdka
(r, s] rjcfdka
(r, s] rjmoex
(r, s] rjmoex
(r, s] rgoe
(r, s] rgoe
(r, s] rtllnzc
(r, s] rtllnzc
(r, s] rbdwbhl
(r, s] rbdwbhl
(r, s] rvkohgf
(r, s] rvkohgf
(r, s] rr
(r, s] rr
(r, s] rq
(r, s] rq
(r, s] rp
(r, s] rp
(r, s] rm
(r, s] rm
(r, s] rl
(r, s] rl
(r, s] rk
(r, s] rk
(r, s] rj
(r, s] rj
(r, s] re
(r, s] re
(r, s] rd
(r, s] rd
(r, s] ra
(r, s] ra
(r, s] rebdkgtr
(r, s] rebdkgtr
(r, s] rbmnele
(r, s] rbmnele
(r, s] rrsiv
(r, s] rrsiv
(r, s] rjtvn
(r, s] rjtvn
(r, s] rffdyj
(r, s] rffdyj
(r, s] rea
(r, s] rea
(r, s] s
(r, s] s
(r, s] rdchi
(r, s] rdchi
(r, s] rnzrb
(r, s] rnzrb
(r, s] rkjxzpwd
(r, s] rkjxzpwd
(r, s] rlzrxxra
(r, s] rlzrxxra
(r, s] rmf
(r, s] rmf
(r, s] rlg
(r, s] rlg
(r, s] rjpogqj
(r, s] rjpogqj
(r, s] rnviy
(r, s] rnviy
(r, s] rcigwg
(r, s] rcigwg
(r, s] rodg
(r, s] rodg
(r, s] rvwvkfhn
(r, s] rvwvkfhn
(r, s] ric
(r, s] ric
(r, s] rwl
(r, s] rwl
(r, s] rozd
(r, s] rozd
(r, s] rvw
(r, s] rvw
(r, s] rsz
(r, s] rsz
(r, s] roppn
(r, s] roppn
(r, s] ruzuy
(r, s] ruzuy
(r, s] rxgo
(r, s] rxgo
(r, s] rhhiefr
(r, s] rhhiefr
(r, s] rsfds
(r, s] rsfds
(r, s] rimaj
(r, s] rimaj
(r, s] rtdao
(r, s] rtdao
(r, s] rwnwj
(r, s] rwnwj
(r, s] rdbyizmt
(r, s] rdbyizmt
(r, s] rbxunbvn
(r, s] rbxunbvn
(r, s] rfwvfzs
(r, s] rfwvfzs
(r, s] rrhsitdf
(r, s] rrhsitdf
(r, s] rbvrh
(r, s] rbvrh
(r, s] rrsutcxg
(r, s] rrsutcxg
(r, s] rvkds
(r, s] rvkds
(r, s] rqmw
(r, s] rqmw
(r, s] rpswp
(r, s] rpswp
(r, s] rgmabb
(r, s] rgmabb
(r, s] relvjbcz
(r, s] relvjbcz
(r, s] rumtmik
(r, s] rumtmik
(r, s] rmgtvs
(r, s] rmgtvs
(r, s] ryvyt
(r, s] ryvyt
(r, s] rjlyen
(r, s] rjlyen
(r, s] rrbl
(r, s] rrbl
(r, s] rmxyecr
(r, s] rmxyecr
(r, s] rjzeu
(r, s] rjzeu
(r, s] rslqhmp
(r, s] rslqhmp
(r, s] rvgv
(r, s] rvgv
(r, s] rfbccyfp
(r, s] rfbccyfp
(r, s] rnktca
(r, s] rnktca
(r, s] rlcjeafa
(r, s] rlcjeafa
(r, s] rjcfdka
(r, s] rjcfdka
(r, s] rjmoex
(r, s] rjmoex
(r, s] rgoe
(r, s] rgoe
(r, s] rtllnzc
(r, s] rtllnzc
(r, s] rbdwbhl
(r, s] rbdwbhl
(r, s] rvkohgf
(r, s] rvkohgf
(r, s] rr
(r, s] rr
(r, s] rq
(r, s] rq
(r, s] rp
(r, s] rp
(r, s] rm
(r, s] rm
(r, s] rl
(r, s] rl
(r, s] rk
(r, s] rk
(r, s] rj
(r, s] rj
(r, s] re
(r, s] re
(r, s] rd
(r, s] rd
(r, s] ra
(r, s] ra
(r, s] rebdkgtr
(r, s] rebdkgtr
(r, s] rbmnele
(r, s] rbmnele
(r, s] rrsiv
(r, s] rrsiv
(r, s] rjtvn
(r, s] rjtvn
(r, s] rffdyj
(r, s] rffdyj
(r, s] rea
(r, s] rea
(r, s] s
(r, s] s
(r, s] rdchi
(r, s] rdchi
(r, s] rnzrb
(r, s] rnzrb
(r, s] rkjxzpwd
(r, s] rkjxzpwd
(r, s] rlzrxxra
(r, s] rlzrxxra
(r, s] rmf
(r, s] rmf
(r, s] rlg
(r, s] rlg
(r, s] rjpogqj
(r, s] rjpogqj
(r, s] rnviy
(r, s] rnviy
(r, s] rcigwg
(r, s] rcigwg
(r, s] rodg
(r, s] rodg
(r, s] rvwvkfhn
(r, s] rvwvkfhn
(r, s] ric
(r, s] ric
(r, s] rwl
(r, s] rwl
(r, s] rozd
(r, s] rozd
(r, s] rvw
(r, s] rvw
(r, s] rsz
(r, s] rsz
(r, s] roppn
(r, s] roppn
(r, s] ruzuy
(r, s] ruzuy
(r, s] rxgo
(r, s] rxgo
(r, s] rhhiefr
(r, s] rhhiefr
(r, s] rsfds
(r, s] rsfds
(r, s] rimaj
(r, s] rimaj
(r, s] rtdao
(r, s] rtdao
(
hadoop中Map-Reduce使用示例,输入(DBInputFormat),输出(DBOu-MR_HBase.zip
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更新于2023-11-06
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在Hadoop生态系统中,MapReduce是一种分布式计算框架,用于处理和生成大规模数据集。这个示例,"MR_HBase-Hadoop中的MapReduce使用示例,输入(DBInputFormat),输出(DBOutputFormat)",主要展示了如何利用MapReduce与HBase进行交互,进行数据的读取和写入。下面将详细介绍相关的知识点。
1. **MapReduce**: MapReduce是Hadoop的核心组件之一,它将大型数据集分解成小块,然后在分布式集群上的多台机器上并行处理。整个过程分为两个主要阶段:Map阶段和Reduce阶段。Map阶段负责对原始数据进行切分和处理,而Reduce阶段则将Map阶段的结果进行聚合和汇总。
2. **DBInputFormat**: 这是一个特殊的输入格式,允许MapReduce作业从关系型数据库(如MySQL,PostgreSQL等)或者NoSQL数据库(如HBase)中读取数据。`DBInputFormat`提供了一种方式,使得开发者可以轻松地从数据库中定制输入数据,而不是直接从HDFS读取。
3. **HBase**: HBase是一个基于Google Bigtable设计的开源、分布式、版本化的非关系型数据库,运行在Hadoop之上。它适合存储大量结构化或半结构化数据,提供了高并发读写操作,尤其适用于实时数据查询。
4. **DBOutputFormat**: 类似于DBInputFormat,DBOutputFormat是MapReduce的一种输出格式,它允许作业的结果直接写回到数据库中。在本示例中,可能是在MapReduce处理后,将结果存入HBase数据库。
5. **MR_HBase-master**: 这可能是示例代码的主目录,包含了实现MapReduce任务的所有源代码、配置文件和测试数据。在这个目录下,通常会有Java源代码文件,这些文件定义了Mapper和Reducer类,以及可能的Driver类,用于驱动整个MapReduce作业。
6. **Mapper和Reducer**: 在MapReduce中,Mapper是处理输入数据的第一步,它接收输入键值对,进行处理,然后生成中间键值对。Reducer则接收Mapper的输出,进行聚合和总结,生成最终的输出键值对。在这个示例中,Mapper可能会从HBase读取数据,而Reducer则可能负责将处理结果写回HBase。
7. **配置与运行**: 在运行这个MapReduce作业之前,需要配置Hadoop和HBase的相关设置,包括数据库连接参数、HBase表信息等。这通常通过修改配置文件(如`hbase-site.xml`和`core-site.xml`)来完成。
8. **数据模型与交互**: MapReduce与HBase的数据交互涉及到HBase的数据模型,包括表、列族、列和行键。Mapper需要知道如何根据这些信息从HBase中读取数据,而Reducer则需要知道如何将结果写回特定的HBase表和列族。
9. **性能优化**: 在实际应用中,可能会涉及一些MapReduce和HBase的性能优化技巧,比如分区策略、缓存设置、数据本地性等,以提高整体的处理效率。
10. **测试与调试**: MR_HBase-master目录下的测试数据和脚本可以帮助验证MapReduce作业的正确性和性能。开发者通常会编写单元测试和集成测试,确保代码在不同场景下都能正常工作。
通过理解和实践这个示例,开发者可以更好地掌握如何利用Hadoop的MapReduce框架与HBase数据库进行数据处理,这对于大数据分析和实时查询场景具有重要的实用价值。

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