hive-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Jesus Camacho Rodriguez (JIRA)" <>
Subject [jira] [Commented] (HIVE-15277) Teach Hive how to create/delete Druid segments
Date Thu, 15 Dec 2016 20:56:58 GMT


Jesus Camacho Rodriguez commented on HIVE-15277:

We should update the Druid integration wiki with information about new features introduced
in this patch.

> Teach Hive how to create/delete Druid segments 
> -----------------------------------------------
>                 Key: HIVE-15277
>                 URL:
>             Project: Hive
>          Issue Type: Sub-task
>          Components: Druid integration
>    Affects Versions: 2.2.0
>            Reporter: slim bouguerra
>            Assignee: slim bouguerra
>             Fix For: 2.2.0
>         Attachments: HIVE-15277.2.patch, HIVE-15277.patch, HIVE-15277.patch, HIVE-15277.patch,
HIVE-15277.patch, HIVE-15277.patch, HIVE-15277.patch, HIVE-15277.patch, file.patch
> We want to extend the DruidStorageHandler to support CTAS queries.
> In this implementation Hive will generate druid segment files and insert the metadata
to signal the handoff to druid.
> The syntax will be as follows:
> {code:sql}
> CREATE TABLE druid_table_1
> STORED BY 'org.apache.hadoop.hive.druid.DruidStorageHandler'
> TBLPROPERTIES ("druid.datasource" = "datasourcename")
> AS <select `timecolumn` as `___time`, `dimension1`,`dimension2`,  `metric1`, `metric2`....>;
> {code}
> This statement stores the results of query <input_query> in a Druid datasource
named 'datasourcename'. One of the columns of the query needs to be the time dimension, which
is mandatory in Druid. In particular, we use the same convention that it is used for Druid:
there needs to be a the column named '__time' in the result of the executed query, which will
act as the time dimension column in Druid. Currently, the time column dimension needs to be
a 'timestamp' type column.
> metrics can be of type long, double and float while dimensions are strings. Keep in mind
that druid has a clear separation between dimensions and metrics, therefore if you have a
column in hive that contains number and need to be presented as dimension use the cast operator
to cast as string. 
> This initial implementation interacts with Druid Meta data storage to add/remove the
table in druid, user need to supply the meta data config as --hiveconf hive.druid.metadata.password=XXX
--hiveconf hive.druid.metadata.username=druid --hiveconf hive.druid.metadata.uri=jdbc:mysql://host/druid

This message was sent by Atlassian JIRA

View raw message