impala

impala time in Hue UI

由 丶灬走出姿态 提交于 2019-12-11 14:27:52
问题 I am trying to Estimate the time required by queries from simple to complex in Impala and using the Hue UI. Will it be possible to know the time needed to complete the query through the UI. 回答1: Impala or Hive only provides a general estimate of progress. Hue could try to display an end time by extrapolating the start time by the current progress. Feel free to follow https://issues.cloudera.org/browse/HUE-1219. 回答2: Although it seems to be not possible with Hue UI but in Command Shell its the

Java Timestamp to BigInt for Impala

由 强颜欢笑 提交于 2019-12-11 11:49:49
问题 I am reading a text file which has a field in Timestamp in this format "yyyy-MM-dd HH:mm:ss" I want to be able to convert it to a field in Impala as BigInt and should like yyyMMddHHmmss in Java. I am using Talend for the ETL but I get this error "schema's dbType not correct for this component" and so I want to have the right transformation in my tImpalaOutput component 回答1: One obvious option is to read the date in as a string, format it to the output you want and then convert it to a long

Tableau: Error while using Impala to connect to Cloudera Hadoop

由 冷暖自知 提交于 2019-12-11 09:28:29
问题 I am working on using Tableau to connect to Cloudera Hadoop. I provide the server and port details and connect using "Impala". I am able to succesfully connect, select default Schema and choose the required table (s). After this, when I drag and drop either a dimension or a measure to Rows/Columns on the 'grid', i get the below error: [Cloudera][Hardy] (22) Error from ThriftHiveClient: Query returned non-zero code: 10025, cause: FAILED: SemanticException [Error 10025]: Line 1:7 Expression not

Join table by string matching in Hive or Impala or Pig

由 我的未来我决定 提交于 2019-12-11 04:36:42
问题 I have two tables A and B , where B is huge (20 million by 300) and A is of moderate size (300k by 10). A contains one column that is address and B contains 3 columns that can be put together to form a proper street address. For example, in A , the address column could be: id | Address ----------- 233 | 123 Main St and in B we could have: Number | Street_name | Street_suffix | Tax ------------------------------------------------ 123 | Main | Street | 320.2 I want to join them using string

Hive - Rolling up the amount balance from leaf node to top parent

由 怎甘沉沦 提交于 2019-12-11 04:31:44
问题 I have Hierarchy table have Organization level Parent Child relationships. and other table has account balance for the lowest level child in hierarchy table. I need to find all levels of Hierarchy starting from top child to lowest child. All top parent_node have top end parent as "****" . Please suggest hive query to solve this problem. Input Table: Hierarchy Table: +---------------+----------------+ |parent_node_id | child_node_id | +---------------+----------------+ | C1 | C11 | +----------

Apache Impala shell命令参数

由 …衆ロ難τιáo~ 提交于 2019-12-11 04:26:36
Impala-shell命令参数 主节点node-3启动以下三个服务进程 service impala-state-store start service impala-catalog start service impala-server start 从节点启动node-1与node-2启动impala-server service impala-server start impala-shell外部命令 所谓的外部命令指的是不需要进入到impala-shell交互命令行当中即可执行的命令参数。 impala-shell后面执行的时候可以带很多参数。 你可以在启动 impala-shell 时设置，用于修改命令执行环境。 impala-shell –h可以帮助我们查看帮助手册。也可以参考课程附件资料。 [ root@hadoop03 ~ ] # impala - shell - h Usage : impala_shell . py [ options ] Options : - h , -- help show this help message and exit - i IMPALAD , -- impalad = IMPALAD < host : port > of impalad to connect to [ default : hadoop03 . Hadoop .

impala 内部命令与外部命令

由 微笑、不失礼 提交于 2019-12-11 04:06:12
外部命令： impala-shell –h 可以帮助我们查看帮助手册 impala-shell –r 刷新impala元数据 impala-shell –f ``文件路径`` 执行指的的sql查询文件。 impala-shell –i 指定连接运行 impalad 守护进程的主机。 impala-shell –o 保存执行结果到文件当中去。 内部命令 connect hostname 连接到指定的机器impalad上去执行。 refresh dbname.tablename 增量刷新，刷新某一张表的元数据，主要用于刷新hive当中数据表里面的数据改变的 情况。 invalidate metadata 全量刷新，性能消耗较大，主要用于hive当中新建数据库或者数据库表的时候来进行刷新。 quit/exit``命令 从Impala shell中弹出 `` explain ``命令`` 用于查看sql语句的执行计划。 来源： CSDN 作者： ✌听风223232✌✌ 链接： https://blog.csdn.net/qq_43791724/article/details/103480409

Access tables from Impala through Python

由 不羁的心 提交于 2019-12-11 04:05:17
问题 I need to access tables from Impala through CLI using python on the same cloudera server I have tried below code to establish the connection : def query_impala(sql): cursor = query_impala_cursor(sql) result = cursor.fetchall() field_names = [f[0] for f in cursor.description] return result, field_names def query_impala_cursor(sql, params=None): conn = connect(host='xx.xx.xx.xx', port=21050, database='am_playbook',user='xxxxxxxx', password='xxxxxxxx') cursor = conn.cursor() cursor.execute(sql

How to pivot data in Hive with aggregation

由 ♀尐吖头ヾ 提交于 2019-12-11 03:25:56
问题 I have a table data like below and I want to pivot the data with aggregation . ColumnA ColumnB ColumnC 1 complete Yes 1 complete Yes 2 In progress No 2 In progress No 3 Not yet started initiate 3 Not yet started initiate Want to Pivot like below ColumnA Complete In progress Not yet started 1 2 0 0 2 0 2 0 3 0 0 2 Is there anyway that we can achieve this in hive or Impala? 回答1: Use case with sum aggregation: select ColumnA, sum(case when ColumnB='complete' then 1 else 0 end) as Complete, sum

Apache Impala 安装与介绍

由 亡梦爱人 提交于 2019-12-11 03:15:10
Impala基本介绍 impala是cloudera提供的一款高效率的sql查询工具，提供实时的查询效果，官方测试性能比hive快10到100倍，其sql查询比sparkSQL还要更加快速，号称是当前大数据领域最快的查询sql工具， impala是参照谷歌的新三篇论文（Caffeine–网络搜索引擎、Pregel–分布式图计算、Dremel–交互式分析工具）当中的Dremel实现而来，其中旧三篇论文分别是（BigTable，GFS，MapReduce）分别对应我们即将学的HBase和已经学过的HDFS以及MapReduce。 impala是基于hive并使用内存进行计算，兼顾数据仓库，具有实时，批处理，多并发等优点。 Impala与Hive关系 mpala是基于hive的大数据分析查询引擎，直接使用hive的元数据库metadata，意味着impala元数据都存储在hive的metastore当中，并且impala兼容hive的绝大多数sql语法。所以需要安装impala的话，必须先安装hive，保证hive安装成功，并且还需要启动hive的metastore服务。 Hive元数据包含用Hive创建的database、table等元信息。元数据存储在关系型数据库中，如Derby、MySQL等。 客户端连接metastore服务，metastore再去连接MySQL数据库来存取元数据
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