WebIn impala-shell, issue a one-time INVALIDATE METADATA table_name statement to make Impala aware of a table created through Hive. (Another reason to prefer to do the DDL through Impala.) In impala-shell, issue a REFRESH table_name statement any time data is added to or removed from a table through Hive or manual HDFS operations. WebIn any way, impala daemons still continue to function. To invalidate the metadata if there is an update to it the user has to manually run a command. However, we need to issue REFRESH or INVALIDATE METADATA on an Impala node before executing a query there if we create any table, load data, and so on through Hive.
Running Commands and SQL Statements in impala-shell
WebBecause Impala caches table metadata (such as the list of partitions), you need to refresh the table metadata in Impala using refresh store_sales_landing_tbl. That means, if the ingestion is happening once per min, the msck repair and … WebIn Impala 2.5 and higher, you can define substitution variables to be used within SQL statements processed by impala-shell . You specify the variable and its value as below. On the command line, you specify the option --var=variable_name=value chanin estates
curl - Run Impala Refresh from Hive or Webhdfs - Stack Overflow
WebThe syntax is refresh and the table name. But if you've added a new table to the database from outside of Impala, then you'll need to use a different command to update Impala's metadata cache. The command is invalidate metadata and the table name. This command causes Impala to add all the information about this new table to its metadata cache. WebThe history Imapala Command displays the last 10 commands executed in the shell. Following is the example of the history command. So, here we have executed 5 commands, namely, version, help, show, use, and history. [quickstart.cloudera:21000] > history; [1]:version; [2]:help; [3]:show databases; [4]:use my_db; [5]:history; iv. Quit/exit Command WebImpala creates a directory in HDFS to hold the data files. You can create data in internal tables by issuing INSERT or LOAD DATA statements. If you add or replace data using HDFS operations, issue the REFRESH command in impala-shell so that Impala recognizes the changes in data files, block locations, and so on. harley davidson motorcycles australia prices