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    0480-如何从HDP2.6.5原地迁移到CDH5.16.1

    我们常使用的Hadoop平台包括Apache Hadoop,CDH和HDP,有时我们会碰到需要迁移平台的情况,举个例子,比如你已经一直在使用Apache Hadoop2.4,近期看到CDH6附带Hadoop3发布了,想迁移到CDH并且做整个平台的所有组件升级。平台迁移和平台升级的方式基本一样的,一般有2种大的选择,第一种是原地升级即直接在原有平台上操作,该办法操作效率较高,马上看到效果,但往往风险较高,比如升级失败回滚方案不完善,跨大版本比如Hadoop2到Hadoop3可能HDFS还有丢数据的风险;第二种是拷贝数据的方式升级,需要额外的服务器资源,会新搭平台,然后把旧的平台的数据拷贝过去,数据拷贝完毕后,再把旧集群的机器下线了慢慢加入到新集群,该方法一般实施周期较长,但是风险较小。根据实际情况可以选择不同的方式来进行平台迁移或者平升级,另外对于两种方案还可以具体细化分类出不同的方案,比如第一种方案考虑提前备份数据或者备份关键数据等,本文Fayson不做细化讨论。

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    hadoop记录 - 乐享诚美

    RDBMS Hadoop Data Types RDBMS relies on the structured data and the schema of the data is always known. Any kind of data can be stored into Hadoop i.e. Be it structured, unstructured or semi-structured. Processing RDBMS provides limited or no processing capabilities. Hadoop allows us to process the data which is distributed across the cluster in a parallel fashion. Schema on Read Vs. Write RDBMS is based on ‘schema on write’ where schema validation is done before loading the data. On the contrary, Hadoop follows the schema on read policy. Read/Write Speed In RDBMS, reads are fast because the schema of the data is already known. The writes are fast in HDFS because no schema validation happens during HDFS write. Cost Licensed software, therefore, I have to pay for the software. Hadoop is an open source framework. So, I don’t need to pay for the software. Best Fit Use Case RDBMS is used for OLTP (Online Trasanctional Processing) system. Hadoop is used for Data discovery, data analytics or OLAP system. RDBMS 与 Hadoop

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    hadoop记录

    RDBMS Hadoop Data Types RDBMS relies on the structured data and the schema of the data is always known. Any kind of data can be stored into Hadoop i.e. Be it structured, unstructured or semi-structured. Processing RDBMS provides limited or no processing capabilities. Hadoop allows us to process the data which is distributed across the cluster in a parallel fashion. Schema on Read Vs. Write RDBMS is based on ‘schema on write’ where schema validation is done before loading the data. On the contrary, Hadoop follows the schema on read policy. Read/Write Speed In RDBMS, reads are fast because the schema of the data is already known. The writes are fast in HDFS because no schema validation happens during HDFS write. Cost Licensed software, therefore, I have to pay for the software. Hadoop is an open source framework. So, I don’t need to pay for the software. Best Fit Use Case RDBMS is used for OLTP (Online Trasanctional Processing) system. Hadoop is used for Data discovery, data analytics or OLAP system. RDBMS 与 Hadoop

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