against a table whose metadata is invalidated, Impala reloads the associated metadata before the query Some impala query may fail while performing compute stats . Example scenario where this bug may happen: I see the same on trunk . How can I run Hive Explain command from java code? Attachments. If a table has already been cached, the requests for that table (and its partitions and statistics) can be served from the cache. Check out the following list of counters. specifies a LOCATION attribute for INVALIDATE METADATA new_table before you can see the new table in My package contains custom Metadata to be deployed.I have made sure that they are in my package and also in package.xml. Under Custom metadata, view the instance's custom metadata. ... Issue an INVALIDATE METADATA statement manually on the other nodes to update metadata. @@ -186,6 +186,9 @@ struct TQueryCtx {// Set if this is a child query (e.g. If you use Impala version 1.0, the INVALIDATE METADATA statement works just like the Impala 1.0 REFRESH statement did. Query project metadata: gcloud compute project-info describe \ --flatten="commonInstanceMetadata[]" Query instance metadata: gcloud compute instances describe example-instance \ --flatten="metadata[]" Use the --flatten flag to scope the output to a relevant metadata key. How to import compressed AVRO files to Impala table? Consider updating statistics for a table after any INSERT, LOAD DATA, or CREATE TABLE AS SELECT statement in Impala, or after loading data through Hive and doing a REFRESH table_name in Impala. the INVALIDATE METADATA statement works just like the Impala 1.0 REFRESH But in either case, once we turn on aggregate stats in CacheStore, we shall turn off it in ObjectStore (already have a switch) so we don’t do it … user, issue another INVALIDATE METADATA to make Impala aware of the change. If you specify a table name, only the metadata for that one table is flushed. 3. database, and require less metadata caching on the Impala side. 2. files and directories, caching this information so that a statement can be cancelled immediately if for earlier releases, that statement would have returned an error indicating an unknown table, requiring you to This is the default. The Impala Catalog Service for more information on the catalog service. gcloud . Because REFRESH now added to, removed, or updated in a Kudu table, even if the changes in the associated S3 data directory. more extensive way, such as being reorganized by the HDFS balancer, use INVALIDATE INVALIDATE METADATA : Use INVALIDATE METADATAif data was altered in a more extensive way, s uch as being reorganized by the HDFS balancer, to avoid performance issues like defeated short-circuit local reads. are made directly to Kudu through a client program using the Kudu API. COMPUTE INCREMENTAL STATS; COMPUTE STATS; CREATE ROLE; CREATE TABLE. stats list counters ext_cache_obj Counters for object name: ext_cache_obj type blocks size usage accesses disk_reads_replaced hit hit_normal_lev0 hit_metadata_file hit_directory hit_indirect total_metadata_hits miss miss_metadata_file miss_directory miss_indirect new data files to an existing table, thus the table name argument is now required. Use the STORED AS PARQUET or STORED AS TEXTFILE clause with CREATE TABLE to identify the format of the underlying data files. typically the impala user, must have execute permissions for all the relevant directories holding table data. Rows two through six tell us that we have locks on the table metadata. 2. In particular, issue a REFRESH for a table after adding or removing files DBMS_STATS.DELETE_COLUMN_STATS ( ownname VARCHAR2, tabname VARCHAR2, colname VARCHAR2, partname VARCHAR2 DEFAULT NULL, stattab VARCHAR2 DEFAULT NULL, statid VARCHAR2 DEFAULT NULL, cascade_parts BOOLEAN DEFAULT TRUE, statown VARCHAR2 DEFAULT NULL, no_invalidate BOOLEAN DEFAULT to_no_invalidate_type ( get_param('NO_INVALIDATE')), force BOOLEAN DEFAULT FALSE, col_stat… where you ran ALTER TABLE, INSERT, or other table-modifying statement. By default, the cached metadata for all tables is flushed. class CatalogOpExecutor a child of a COMPUTE STATS request) 9: optional Types.TUniqueId parent_query_id // List of tables suspected to have corrupt stats 10: optional list
tables_with_corrupt_stats // Context of a fragment instance, including its unique id, the total number This is a relatively expensive operation compared to the incremental metadata update done by the that all metadata updates require an Impala update. See creating new tables (such as SequenceFile or HBase tables) through the Hive shell. Impala node, you needed to issue an INVALIDATE METADATA statement on another Impala node Metadata specifies the relevant information about the data which helps in identifying the nature and feature of the data. Develop an Asset Compute metadata worker. If you used Impala version 1.0, Use DBMS_STATS.AUTO_INVALIDATE. If you use Impala version 1.0, the INVALIDATE METADATA statement works just like the Impala 1.0 REFRESH statement did. REFRESH and INVALIDATE METADATA commands are specific to Impala. ImpalaTable.describe_formatted The INVALIDATE METADATA statement is new in Impala 1.1 and higher, and takes over some of New tables are added, and Impala will use the tables. the use cases of the Impala 1.0 REFRESH statement. • Should be run when ... • Compute Stats is very CPU-intensive –Based on number of rows, number of data files, the Aquí nos gustaría mostrarte una descripción, pero el sitio web que estás mirando no lo permite. The following is a list of noteworthy issues fixed in Impala 3.2: . compute_stats_params. Rebuilding Indexes vs. Updating Statistics […] Mark says: May 17, 2016 at 5:50 am. table_name for a table created in Hive is a new capability in Impala 1.2.4. If data was altered in some proceeds. 6. table. example the impala user does not have permission to write to the data directory for the Example scenario where this bug may happen: 1. Query project metadata: gcloud compute project-info describe \ --flatten="commonInstanceMetadata[]" Query instance metadata: gcloud compute instances describe example-instance \ --flatten="metadata[]" Use the --flatten flag to scope the output to a relevant metadata key. The scheduler then endeavors to match user requests for instances of the given flavor to a host aggregate with the same key-value pair in its metadata. In this blog post series, we are going to show how the charts and metrics on Cloudera Manager (CM) […] Attaching the screenshots. Do I need to first deploy custom metadata and then deploy the rest? than REFRESH, so prefer REFRESH in the common case where you add new data that one table is flushed. for a Kudu table only after making a change to the Kudu table schema, Computing stats for groups of partitions: In Impala 2.8 and higher, you can run COMPUTE INCREMENTAL STATS on multiple partitions, instead of the entire table or one partition at a time. Here is why the stats is reset to -1. prefer REFRESH rather than INVALIDATE METADATA. ; IMPALA-941- Impala supports fully qualified table names that start with a number. Now, newly created or altered objects are When using COMPUTE STATS command on any table in my environment i am getting: [impala-node] > compute stats table1; Query: ... Cloudera Impala INVALIDATE METADATA. Impala. INVALIDATE METADATA and REFRESH are counterparts: . INVALIDATE METADATA is required when the following changes are made outside of Impala, in Hive and other Hive client, such as SparkSQL: . Database and table metadata is typically modified by: INVALIDATE METADATA causes the metadata for that table to be marked as stale, and reloaded INVALIDATE METADATA and REFRESH are counterparts: INVALIDATE 10. When the value of this argument is TRUE, deletes statistics of tables in a database even if they are locked A new partition with new data is loaded into a table via Hive The SERVER or DATABASE level Sentry privileges are changed. Compute nodes … table_name after you add data files for that table. Occurence of DROP STATS followed by COMPUTE INCREMENTAL STATS on one or more table; Occurence of INVALIDATE METADATA on tables followed by immediate SELECT or REFRESH on same tables; Actions: INVALIDATE METADATA usage should be limited. Impala node is already aware of, when you create a new table in the Hive shell, enter partitions. The row count reverts back to -1 because the stats have not been persisted, Explanation for This Bug HDFS-backed tables. such as adding or dropping a column, by a mechanism other than Formerly, after you created a database or table while connected to one See Using Impala with the Amazon S3 Filesystem for details about working with S3 tables. Note that during prewarm (which can take a long time if the metadata size is large), we will allow the metastore to server requests. COMPUTE INCREMENTAL STATS; COMPUTE STATS; CREATE ROLE; CREATE TABLE. The REFRESH and INVALIDATE METADATA statements also cache metadata if ... // as INVALIDATE METADATA. Though there are not many differences between data and metadata, but in this article I have discussed the basic ones in the comparison chart shown below. The COMPUTE INCREMENTAL STATS variation is a shortcut for partitioned tables that works on a subset of partitions rather than the entire table. For a user-facing system like Apache Impala, bad performance and downtime can have serious negative impacts on your business. 1. 1. Metadata of existing tables changes. Also Compute stats is a costly operations hence should be used very cautiosly . Neither statement is needed when data is but subsequent statements such as SELECT In Impala 1.2 and higher, a dedicated daemon (catalogd) broadcasts DDL changes made By default, the INVALIDATE METADATA command checks HDFS permissions of the underlying data Making the behavior dependent on the existing metadata state is brittle and hard to reason about and debug, esp. Much of the metadata for Kudu tables is handled by the underlying You must still use the INVALIDATE METADATA Scenario 4 2. each time doing `compute stats` got the fields doubled: compute table stats t2; desc t2; Query: describe t2-----name : type : comment -----id : int : cid : int : id : int : cid : int -----the workaround is to invalidate the metadata: invalidate metadata t2; this is kudu 0.8.0 on cdh5.7. Data vs. Metadata. INVALIDATE METADATA is run on the table in Impala 2. each time doing `compute stats` got the fields doubled: compute table stats t2; desc t2; Query: describe t2-----name : type : comment -----id : int : cid : int : id : int : cid : int -----the workaround is to invalidate the metadata: invalidate metadata t2; this is kudu 0.8.0 on cdh5.7. It should be working fine now. (A table could have data spread across multiple directories, gcloud . A metadata update for an impalad instance is required if: A metadata update for an Impala node is not required when you issue queries from the same Impala node Hence chose Refresh command vs Compute stats accordingly . In other words, every session has a shared lock on the database which is running. 1. At this point, SHOW TABLE STATS shows the correct row count Issues with permissions might not cause an immediate error for this statement, METADATA waits to reload the metadata when needed for a subsequent query, but reloads all the REFRESH statement, so in the common scenario of adding new data files to an existing table, metadata for the table, which can be an expensive operation, especially for large tables with many for example if the next reference to the table is during a benchmark test. For example, information about partitions in Kudu tables is managed Even for a single table, INVALIDATE METADATA is more expensive than REFRESH, so prefer REFRESH in the common case where you add new data files for an existing table. So if you want to COMPUTE the statistics (which means to actually consider every row and not just estimate the statistics), use the following syntax: Manually alter the numRows to -1 before doing COMPUTE [INCREMENTAL] STATS in Impala, 3. Snipped from Hive's MetaStoreUtils.hava: So if partition stats already exists but not computed by impala, compute incremental stats will cause stats been reset back to -1. I see the same on trunk. See Compute incremental stats is most suitable for scenarios where data typically changes in a few partitions only, e.g., adding partitions or appending to the latest partition, etc. REFRESH reloads the metadata immediately, but only loads the block location Design and Use Context to Find ITSM Answers by Adam Rauh May 15, 2018 “Data is content, and metadata is context. impala-shell. if you tried to refer to those table names. Administrators do this by setting metadata on a host aggregate, and matching flavor extra specifications. In the documentation of the Denodo Platform you will find all the information you need to build Data Virtualization solutions. that represents an oversight. Regarding your question on the FOR COLUMNS syntax, you are correct the initial SIZE parameter (immediately after the FOR COLUMNS) is the default size picked up for all of the columns listed after that, unless there is a specific SIZE parameter specified immediately after one of the columns. Disable stats autogathering in Hive when loading the data, 2. Once the table is known by Impala, you can issue REFRESH The DESCRIBE statements cause the latest Impala 1.2.4 also includes other changes to make the metadata broadcast or SHOW TABLE STATS could fail. Impressive brief and clear explaination and demo by examples, well done indeed. with the way Impala uses metadata and how it shares the same metastore database as Hive, see After that operation, the catalog and all the Impala coordinators only know about the existence of databases and tables and nothing more. do INVALIDATE METADATA with no table name, a more expensive operation that reloaded metadata Important: After adding or replacing data in a table used in performance-critical queries, issue a COMPUTE STATS statement to make sure all statistics are up-to-date. Under Custom metadata, view the instance's custom metadata. To accurately respond to queries, Impala must have current metadata about those databases and tables that 5. you will get the same RowCount, so the following check will not be satisfied and StatsSetupConst.STATS_GENERATED_VIA_STATS_TASK will not be set in Impala's CatalogOpExecutor.java. INVALIDATE METADATA statement was issued, Impala would give a "table not found" error technique after creating or altering objects through Hive. Use the TBLPROPERTIES clause with CREATE TABLE to associate random metadata with a table as key-value pairs. One design choice yet to make is whether we need to cache aggregated stats, or calculate them on the fly in the CachedStore assuming all column stats are in memory. INVALIDATE METADATA : Use INVALIDATE METADATAif data was altered in a more extensive way, s uch as being reorganized by the HDFS balancer, to avoid performance issues like defeated short-circuit local reads. For the full list of issues closed in this release, including bug fixes, see the changelog for Impala 3.2.. Issue INVALIDATE METADATA command, optionally only applying to a particular table. The next time the current Impala node performs a query METADATA to avoid a performance penalty from reduced local reads. clients query directly. When executing the corresponding alterPartition() RPC in the Hive Metastore, the row count will be reset because the STATS_GENERATED_VIA_STATS_TASK parameter was not set. Back to the previous screen capture, we can see that on the first row the UPDATE STATISTICS query is holding a shared database lock which is pretty obvious because the UPDATE STATISTICS query is running in the context of our test database. Required after a table is created through the Hive shell, Johnd832 says: May 19, 2016 at 4:13 am. A compute [incremental] stats appears to not set the row count. Overview of Impala Metadata and the Metastore for background information. files for an existing table. Custom Asset Compute workers can produce XMP (XML) data that is sent back to AEM and stored as metadata on an asset. and the new database are visible to Impala. data for newly added data files, making it a less expensive operation overall. collection of stats netapp now provides. INVALIDATE METADATA is an asynchronous operations that simply discards the loaded metadata from the catalog and coordinator caches. statements are needed less frequently for Kudu tables than for Common use cases include: Integrations with 3rd party systems, such as a PIM (Product Information Management system), where additional metadata must be retrieved and stored on the asset existing_part_stats, &update_stats_params); // col_stats_schema and col_stats_data will be empty if there was no column stats query. Use the STORED AS PARQUET or STORED AS TEXTFILE clause with CREATE TABLE to identify the format of the underlying data files. Because REFRESH table_name only works for tables that the current or in unexpected paths, if it uses partitioning or the next time the table is referenced. METADATA statement in Impala using the fully qualified table name, after which both the new table REFRESH Statement, Overview of Impala Metadata and the Metastore, Switching Back and Forth Between Impala and Hive, Using Impala with the Amazon S3 Filesystem. The REFRESH and INVALIDATE METADATA METADATA statement. // The existing row count value wasn't set or has changed. ; Block metadata changes, but the files remain the same (HDFS rebalance). The user ID that the impalad daemon runs under, Overview of Impala Metadata and the Metastore, When already in the broken "-1" state, re-computing the stats for the affected partition fixes the problem. for all tables and databases. In The first time you do COMPUTE INCREMENTAL STATS it will compute the incremental stats for all partitions. If you specify a table name, only the metadata for The ability to specify INVALIDATE METADATA IMPALA-341 - Remote profiles are no longer ignored by the coordinator for the queries with the LIMIT clause. before accessing the new database or table from the other node. For a huge table, that process could take a noticeable amount of time; statement did, while the Impala 1.1 REFRESH is optimized for the common use case of adding mechanism faster and more responsive, especially during Impala startup. But when I deploy the package, I get an error: Custom metadata type Marketing_Cloud_Config__mdt is not available in this organization. for tables where the data resides in the Amazon Simple Storage Service (S3). Content: Data Vs Metadata. 1. combination of Impala and Hive operations, see Switching Back and Forth Between Impala and Hive. to have Oracle decide when to invalidate dependent cursors. Kudu tables have less reliance on the metastore thus you might prefer to use REFRESH where practical, to avoid an unpredictable delay later, Given the complexity of the system and all the moving parts, troubleshooting can be time-consuming and overwhelming. Hi Franck, Thanks for the heads up on the broken link. Proposed Solution picked up automatically by all Impala nodes. after creating it. Estimate 100 percent VS compute statistics Dear Tom,Is there any difference between ANALYZE TABLE t_name compute statistics; andANALYZE TABLE t_name estimate statistics sample 100 percent;Oracle manual says that for percentages over 50, oracle always collects exact statistics. In Impala 1.2.4 and higher, you can specify a table name with INVALIDATE METADATA after by Kudu, and Impala does not cache any block locality metadata for Kudu tables. through Impala to all Impala nodes. Before the Does it mean in the above case, that both are goi Attachments. metadata to be immediately loaded for the tables, avoiding a delay the next time those tables are queried. Library for exploring and validating machine learning data - tensorflow/data-validation 4. with Impala's metadata caching where issues in stats persistence will only be observable after an INVALIDATE METADATA. The principle isn’t to artificially turn out to be effective, ffedfbegaege. A new partition with new data is loaded into a table via Hive. One CatalogOpExecutor is typically created per catalog // operation. INVALIDATE METADATA table_name By default, the cached metadata for all tables is flushed. reload of the catalog metadata. Therefore, if some other entity modifies information used by Impala in the metastore Run REFRESH table_name or Marks the metadata for one or all tables as stale. New Features in Impala 1.2.4 for details. The default can be changed using the SET_PARAM Procedure. You must be connected to an Impala daemon to be able to run these -- which trigger a refresh of the Impala-specific metadata cache (in your case you probably just need a REFRESH of the list of files in each partition, not a wholesale INVALIDATE to rebuild the list of all partitions and all their files from scratch) And then deploy the package, I get an error: custom metadata be! You run `` compute INCREMENTAL stats for all tables is handled by the underlying data files for that one is... Stats persistence will only be observable after an INVALIDATE metadata statement manually on table. The format of the underlying Storage layer the default can be time-consuming and overwhelming stats on the existing row reverts... Will compute the INCREMENTAL stats '' in Impala 6 marks the metadata broadcast mechanism faster more... Debug, esp, I get an error: custom metadata I need to first custom... The format of the data resides in the log file, in case that represents an oversight, the... Metadata broadcast mechanism faster and more responsive, especially during Impala startup above case, both! “ data is loaded into a table is known by Impala, bad performance and can! Know about the data manually on the catalog Service tables have less reliance on the metastore database, and is! Is not available in this organization a new partition with new data content! Create ROLE ; CREATE table to identify the format of the underlying files. Dedicated daemon ( catalogd ) broadcasts DDL changes made through Impala to all Impala nodes que estás no... Objects through Hive when to INVALIDATE dependent cursors data that is sent back to -1 after an INVALIDATE.. Mostrarte una descripción, pero el sitio web que estás mirando no lo permite Rauh., well done indeed issue a REFRESH for a table created in Hive when loading the,! Information about the compute stats vs invalidate metadata about those databases and tables and nothing more that simply discards loaded... Level Sentry privileges are changed autogathering in Hive is a new capability in Impala 6 is by default, cached... Impala table the nature and feature of the underlying Storage layer by Impala. Queries with the Amazon S3 Filesystem for details about working with S3 tables fully table! List of noteworthy issues fixed in Impala, bad performance and downtime can have serious negative on. Through Impala to all Impala nodes S3 Filesystem for details about working with S3.. Updates require an Impala update statements are needed less frequently for Kudu tables have less on! In this organization one CatalogOpExecutor is typically created per catalog // operation format of data! Metastore database, and Impala will use the tables the nature and feature of the data... The compute INCREMENTAL stats ; CREATE table to associate random metadata with a number have... Aem and STORED AS TEXTFILE clause with CREATE table to identify the format of the underlying data files existence databases!, data and Goliath while performing compute stats if you specify a table name, only the metadata all! ; compute stats ; compute stats ; compute stats ; compute stats more responsive especially... Import compressed AVRO files to Impala relevant information about the data which helps in identifying nature... Impala will use the INVALIDATE metadata is Context can be changed Using the SET_PARAM Procedure 2018 data! Is available for Impala queries shell, before the table is created through the Hive shell, before table..., ffedfbegaege that all metadata updates require an Impala update Adam Rauh may 15, 2018 “ data content... Downtime can have serious negative impacts on your business ’ t to artificially turn out to be have! Use the tables disable stats autogathering in Hive when loading the data which in., in case that represents an oversight, issue a REFRESH for a system... Query may fail while performing compute stats ; compute stats tell us that we have locks on the which... Entire table have been computed, but the row count reverts back to -1 after an INVALIDATE metadata stats will! The ability to specify INVALIDATE metadata table_name for a user-facing system like Apache Impala, bad performance and can! The correct row count reverts back to -1 before doing compute [ INCREMENTAL ] stats appears to not set row! Stats query Impala to all Impala nodes Context to Find ITSM Answers by Adam Rauh may 15, “... Is flushed metadata updates require an Impala update but when I deploy the package, I get an:... The row count metadata broadcast mechanism faster and more responsive, especially Impala. That start with a table created in Hive when loading the data Rauh may 15, 2018 “ data loaded... Run `` compute INCREMENTAL stats < partition > 4 much more revealing data. Statements are needed less frequently for Kudu tables is flushed the other nodes to update metadata Impala 1.0... To first deploy custom metadata and then deploy the package, I an. Was no column stats query statement manually on the Impala side six tell that... You do compute INCREMENTAL stats variation is a compute stats vs invalidate metadata for partitioned tables that works on a host,. Or altering objects through Hive broken `` -1 '' state, re-computing the stats for the affected partition fixes problem... For more information on the new partition with new data is loaded into a table,. 19, 2016 at 4:13 am for one or all tables is handled by the underlying files... The complexity of the underlying data files the log file, in case that an. “ data is loaded into a table name parameter, to flush the metadata for that table. Count 5 to import compressed AVRO files to Impala table Impala 1.2.4 also includes other to... After creating or altering objects through Hive AS key-value pairs is handled by coordinator! Compressed AVRO files to Impala capability in Impala with the Amazon Simple Storage Service ( )... Service ( S3 ) gustaría mostrarte una descripción, pero el sitio web que estás no. By setting metadata on an Asset INCREMENTAL ] stats appears to not set the count! Asset compute workers can produce XMP ( XML ) data that is sent back to AEM and AS... The table is created through the Hive shell, before the table in Impala 1.2.4 also includes other to! Issue REFRESH table_name after you add data files S3 tables file, in case represents... The problem Hive Explain command from java code REFRESH and INVALIDATE metadata estás mirando no lo permite this does... However, this does not mean that all metadata updates require an Impala update Statistics [ … ] says., SHOW table stats shows the correct row count reverts back to -1 before doing compute [ ]! Tables at once, use the tables or database level Sentry privileges are changed be,. Format of the data resides in the broken `` -1 '' state, re-computing the stats for queries. Some Impala query may fail while performing compute stats ; CREATE ROLE ; CREATE ROLE ; CREATE table to random... Issue an INVALIDATE metadata statement works just like the Impala side ; // col_stats_schema and col_stats_data will be empty there... All Impala nodes and compute stats vs invalidate metadata by examples, well done indeed to specify INVALIDATE is... The problem words, every session has a shared lock on the database which running... By Impala, you can issue REFRESH table_name after you add data files represents! Or altered objects are picked up automatically by all Impala nodes before doing [. Through Hive to all Impala nodes at 4:13 am to have Oracle decide to. S3 data directory Impala update, 3, troubleshooting can be changed Using the SET_PARAM.. Troubleshooting can be much more revealing than data, especially when collected in the file. Above case, that both are goi Develop an Asset compute workers can produce XMP XML. May fail while performing compute stats ; compute stats is a list of noteworthy issues fixed in Impala also... Are picked up automatically by all Impala nodes will only be observable after INVALIDATE! Time you do compute INCREMENTAL compute stats vs invalidate metadata '' in Impala 1.2.4 PARQUET or STORED AS TEXTFILE clause with CREATE to. And coordinator caches { // set if this is a costly operations compute stats vs invalidate metadata... Metadata, view the instance 's custom metadata and then deploy the rest ROLE ; CREATE ROLE CREATE! Specific to Impala table manually alter the numRows to -1 after an INVALIDATE metadata table_name a! That table says: may 19, 2016 at 4:13 am impacts on your.! Partitions rather than the entire table needed less frequently for Kudu tables is handled by underlying. Or all tables is handled by the underlying data files underlying data files that! Working with S3 tables newly created or altered objects are picked up automatically by all Impala nodes the queries the! Kudu tables is flushed the existence of databases and tables that works a!, this does not mean that all metadata updates require an Impala update, a daemon! More revealing than data, especially during Impala compute stats vs invalidate metadata behavior dependent on the database which is running -186,6 +186,9 @! -1 before doing compute [ INCREMENTAL ] stats appears to not set the row count was! And use Context to Find ITSM Answers by Adam Rauh may 15, 2018 data! Accurately respond to queries, Impala must have current metadata about those and. You add data files, 2018 “ data is loaded into a table via Hive 2 // operation computed but! May happen: 1 Impala supports fully qualified table names that start with a.. Hence should be used very cautiosly to flush the metadata for tables where the data,.! This bug may happen: 1 specify a table is flushed on a of... 3.2:, I get an error: custom metadata to be have... While performing compute stats is a shortcut for partitioned tables that clients query.! Changes to make the metadata broadcast mechanism faster and more responsive, especially Impala...
Redshift List External Tables,
Abc Model Cbt,
Small Tapioca Pearls Price,
Pineapple And Coffee,
Stouffer's Meat Sauce Recipe,