partitions not in metastore athena

For versions below Hive 2.0, add the metastore tables with the following configurations in your existing init script: With Presto under the hood you even get a long list of extra functions including lambda expressions. New DM on House Rules, concerning Nat20 & Rule of Cool. AWS Athena: does `msck repair table` incur costs? DSS uses Glue as a metastore, and Athena for interactive SQL queries, against data stored in customers’s own S3* DSS uses EKS for containerized Python, R and Spark data processing and Machine Learning, as well as API service deployment. if not vals: logging.error('Glue table has is missing partition values') return '' if len(keys) != len(vals): logging.error('Glue table has different number of partition keys in table and values in partition') return '' s_keys = [] for k, v in zip(keys, vals): s_keys.append('%s=%s' % (k['name'], v)) return '/'.join(s_keys) # TODO escape chars in keys and values, see https://github.com/apache/hive/blob/master/standalone-metastore/src/main/java/org/apache/hadoop/hive/metastore… In order to load the partitions automatically, we need to put the column name and value i… I have a firehose that stores data in s3 in the default directory structure: i have a .csv file for each day , and eventually i will have to load data for 4 years. s3://data and run a manual query for Athena to scan the files inside that directory tree. 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By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy. rev 2021.3.12.38768, Sorry, we no longer support Internet Explorer, Stack Overflow works best with JavaScript enabled, Where developers & technologists share private knowledge with coworkers, Programming & related technical career opportunities, Recruit tech talent & build your employer brand, Reach developers & technologists worldwide, @DuduMarkovitz my issue is after running msck repair new partitions are not added automatically, like the posts above show, ... and like my answers show, only a specific directory naming convention, which you are not using, is supported, thanks Ill add year, month , day , hour specifically in my directories, Athena not adding partitions after msck repair table, Hive: Partitioning by part of integer column, https://forums.aws.amazon.com/message.jspa?messageID=789078, https://aws.amazon.com/premiumsupport/knowledge-center/athena-aws-glue-msck-repair-table/, State of the Stack: a new quarterly update on community and product, Podcast 320: Covid vaccine websites are frustrating. For an example of an IAM policy that allows the glue:BatchCreatePartition action, see AmazonAthenaFullAccess managed policy. Automatic schema and partition recognition: Amazon Glue automatically crawls your data sources, identifies data formats, and suggests schemas and transformations. It is happening because the partitions are not created properly. Athena table creation options comparison. Here is a listing of that data in S3: With the above structure, we must use ALTER TABLEstatements in order to load each partition one-by-one into our Athena table. Athena not adding partitions after msck repair table. @Saikrishna Tarapareddy. Top Tip : If you go through the AWS Athena tutorial you notice that you could just use the base directory, e.g. This is needed because the manifest of a partitioned table is itself partitioned in the same directory structure as the table. For example, if the Amazon S3 path is userId, the following partitions aren't added to the AWS Glue Data Catalog: To resolve this issue, use lower case instead of camel case: Actions, resources, and condition keys for Amazon Athena, Actions, resources, and condition keys for AWS Glue, Click here to return to Amazon Web Services homepage, use the AWS Glue Data Catalog with Athena, The AWS Identity and Access Management (IAM) user or role doesn't have a policy that allows the. site design / logo © 2021 Stack Exchange Inc; user contributions licensed under cc by-sa. If the external metastore version is Hive 2.0 or above, use the Hive Schema Tool to create the metastore tables. Both "TBLS" and "PARTITIONS" have a foreign key referencing to SDS(SD_ID). However, by ammending the folder name, we can have Athena load the partitions automatically. Pwned by a website I never subscribed to - How do they have my e-mail address? Not something I would not want to be coding manually. Labels: hive; Description. If the policy doesn't allow that action, then Athena can't add partitions to the metastore. Hive Metastore has a longer history and an active community, so it has gathered lots of features on the way. If a partition already exists, you receive the error Partition already exists. If the Delta table is partitioned, run MSCK REPAIR TABLE mytable after generating the manifests to force the metastore (connected to Presto or Athena) to discover the partitions. Hive stores a list of partitions for each table in its metastore. Is it about finding missing partitions in Hive Metastore or in HDFS directories ? Amazon Athena uses a managed Data Catalog to store information and schemas about the databases and tables that you create for your data stored in Amazon S3. How is a person residing abroad subject to US law? Can my dad remove himself from my car loan? The discover.partitions table property is automatically created and enabled for external partitioned tables. Running the MSCK statement ensures that the tables are properly populated. The database is present, but there are no metastore tables. You can find part 1 here and part 2 here. For an example of an IAM policy that allows the glue:BatchCreatePartition action, see AmazonAthenaFullAccess managed policy. Restrictions Presto comes pre-installed on EMR 5.0.0 and later. However, Athena has many comparable features and deep integrations with other AWS services. If partitions are manually added to the distributed file system (DFS), the metastore is not aware of these partitions. Hive dynamic partition external table. Partitioning can be done in two ways - Dynamic Partitioning and Static Partitioning. "PARTITIONS" stores the information of Hive table partitions. Solution. Fix Version/s: None Component/s: Hive. Hive metastore 0.13 on MySQL Root Cause: In Hive Metastore tables: "TBLS" stores the information of Hive tables. 2 Answers 2. Ask Question Asked 3 years, ... Partitions not in metastore: clicks:2017/08/26/10 I can add these partitions manually and everything works however, I was wondering why msck repair does not add these partitions automatically and update the metastore? Because it’s built on an older version of … Like the previous articles, our data is JSON data. Athena creates metadata only when a table is created. This developer built a…, HDINSIGHT hive, MSCK REPAIR TABLE table_name throwing error, Create table partition in Hive for year,month and day, Apache hive MSCK REPAIR TABLE new partition not added, handle subfolders after partitions in hive. Usage of Athena is not free but it has an attractive price model, you pay only for the scanned data (currently $5.0 per TiB). When you use the AWS Glue Data Catalog with Athena, the IAM policy must allow the glue:BatchCreatePartition action. Solution: 1. To avoid this error, you can use the IF NOT EXISTS clause. MSCK not adding the missing partitions to Hive Metastore when the partition names are not in lowercase. In the case of tables partitioned on one or more columns, when new data is loaded in S3, the metadata store does not … Here is the message Athena gives when you create the table: Query successful. DSS uses EMR as a Data Lake for in-cluster Hive and Spark processing When you enable partition projection on a table, Athena ignores any partition metadata in the AWS Glue Data Catalog or external Hive metastore for that table. After running. You can execute " msck repair table " command to find out missing partition in Hive Metastore and it will also add partitions if underlying HDFS directories are present. The data is parsed only when you run the query. Deploying PrestoDB on your own is one way to avoid Athena’s partitioning limitations. According to the Delta documentation and what I experience is a com.databricks.sql.transaction.tahoe.ProtocolChangedException: The protocol version of the Delta table has been changed by a concurrent update.Please try the operation again. If the Delta table is partitioned, run MSCK REPAIR TABLE mytable after generating the manifests to force the metastore (connected to Presto or Athena) to discover the partitions. While creating a table in Athena we mention the partition columns, however, the partitions are not reflected until added explicitly, thus you do not get any records on querying the table. PrestoDB has the Hive system.sync_partition_metadata function to update partitions in metastore; it works better than the MSCK REPAIR TABLE command that AWS Athena uses. "YY/MM/DD/HH" and a table in athena with these columns defined as partitions: year: string, month: string, day: string, hour: string. One record per line: Previously, we partitioned our data into folders by the numPetsproperty. Found this here: https://forums.aws.amazon.com/message.jspa?messageID=789078, For future reference, aside from the two tips mentioned in this article: https://aws.amazon.com/premiumsupport/knowledge-center/athena-aws-glue-msck-repair-table/. Can I use a MacBook as a server with the lid closed? Details. Use MSCK REPAIR TABLE or ALTER TABLE ADD PARTITION to load the partition information into the catalog. Amazon Glue provides out-of-the-box integration with Amazon Athena, Amazon EMR, Amazon Redshift Spectrum, and any Apache Hive Metastore-compatible application. Running SQL Queries with Athena. I can add these partitions manually and everything works however, I was wondering why msck repair does not add these partitions automatically and update the metastore? Log In. © 2021, Amazon Web Services, Inc. or its affiliates. Fortunately, Athena has an easy fix. Athena does not throw an error, but no data is returned. This is needed because the manifest of a partitioned table is itself partitioned in the same directory structure as the table. Features. Who is the true villain of Peter Pan: Peter, or Hook? Posted by: jma7983. Why might not radios be effective in a post-apocalyptic world? When you enable partition projection on a table, Athena ignores any partition metadata in the AWS Glue Data Catalog or external Hive metastore for that table. If you use the load all partitions (MSCK REPAIR TABLE) command, partitions must be in a format understood by Hive. The Amazon Simple Storage Service (Amazon S3) path is in camel case instead of lower case (for example, s3://awsdoc-example-bucket/path/userId=1/, s3://awsdoc-example-bucket/path/userId=2/, s3://awsdoc-example-bucket/path/userId=3/, s3://awsdoc-example-bucket/path/userid=1/, s3://awsdoc-example-bucket/path/userid=2/, s3://awsdoc-example-bucket/path/userid=3/. Allow glue:BatchCreatePartition in the IAM policy. MSCK REPAIR TABLE tableexample; "SDS" stores the information of storage location, input and output formats, SERDE etc. 1 To just create an empty table with schema only you can use WITH NO DATA (see CTAS reference).Such a query will not generate charges, as you do not scan any data. When we use insertInto we no longer need to explicitly partition the DataFrame (after all, the information about data partitioning is in the Hive Metastore, and Spark can access it without our help): 1. Automatically discover partitions and add partitions to migrated external tables in Athena. To use Athena MSCK REPAIR with S3 you need to use key-value pairs as path prefix: clicks/year=2017/month=08/day=26/hour=10/. Hive - external (dynamically) partitioned table, Hi, i created an external table in HIVE with 150 columns. After uploading new files, run MSCK REPAIR TABLE tablename and to add the new files to your table without you having to worry about manually creating partitions. Review the IAM policies attached to the user or role that you're using to execute MSCK REPAIR TABLE. Export. What's the map on Sheldon & Leonard's refrigerator of? How can you get 13 pounds of coffee by using all three weights each trial? If your table has defined partitions, the partitions might not yet be loaded into the AWS Glue Data Catalog or the internal Athena data catalog. This article will cover the S3 data partitioning best practices you need to know in order to optimize your analytics infrastructure for … For more information, see Recover Partitions (MSCK REPAIR TABLE). Priority: Minor . When discover.partitions is enabled for a table, Hive performs an automatic refresh as follows: Adds corresponding partitions that are in the file system, but not in metastore, to the metastore. The Amazon S3 path name must be in lower case. All rights reserved. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Hive stores a list of partitions for each table in its metastore. Periodically keep a Hive metastore in sync with Athena by applying only changed DDL definitions. If a particular projected partition does not exist in Amazon S3, Athena will still project the partition. One record per file. ... Athena Query HIVE_METASTORE_ERROR: ' ' is found. Connect and share knowledge within a single location that is structured and easy to search.