The INVALIDATE METADATA statement is new in Impala 1.1 and higher, and takes over some of (A table could have data spread across multiple directories, against a table whose metadata is invalidated, Impala reloads the associated metadata before the query Required after a table is created through the Hive shell, table_name for a table created in Hive is a new capability in Impala 1.2.4. Run REFRESH table_name or 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. Manually alter the numRows to -1 before doing COMPUTE [INCREMENTAL] STATS in Impala, 3. 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. 2. Making the behavior dependent on the existing metadata state is brittle and hard to reason about and debug, esp. A new partition with new data is loaded into a table via Hive ; IMPALA-941- Impala supports fully qualified table names that start with a number. Workarounds Use the STORED AS PARQUET or STORED AS TEXTFILE clause with CREATE TABLE to identify the format of the underlying data files. Administrators do this by setting metadata on a host aggregate, and matching flavor extra specifications. 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. Rows two through six tell us that we have locks on the table metadata. Do I need to first deploy custom metadata and then deploy the rest? To accurately respond to queries, Impala must have current metadata about those databases and tables that Data vs. Metadata. INVALIDATE METADATA is run on the table in Impala In other words, every session has a shared lock on the database which is running. Scenario 4 See The next time the current Impala node performs a query See Metadata Operation’s •Invalidate Metadata • Runs async to discard the loaded metadata catalog cache, metadata load will be triggered by any subsequent queries. Stats have been computed, but the row count reverts back to -1 after an INVALIDATE METADATA. if you tried to refer to those table names. How to import compressed AVRO files to Impala table? than REFRESH, so prefer REFRESH in the common case where you add new data 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. The default can be changed using the SET_PARAM Procedure. gcloud . If you use Impala version 1.0, the INVALIDATE METADATA statement works just like the Impala 1.0 REFRESH statement did. By default, the INVALIDATE METADATA command checks HDFS permissions of the underlying data 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. A new partition with new data is loaded into a table via Hive. Attaching the screenshots. How can I run Hive Explain command from java code? This is a relatively expensive operation compared to the incremental metadata update done by the 1. 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. Disable stats autogathering in Hive when loading the data, 2. When already in the broken "-1" state, re-computing the stats for the affected partition fixes the problem. Attachments. files and directories, caching this information so that a statement can be cancelled immediately if for 5. 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. that Impala and Hive share, the information cached by Impala must be updated. The first time you do COMPUTE INCREMENTAL STATS it will compute the incremental stats for all partitions. Attachments. 1. 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 reload of the catalog metadata. 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. Note that in Hive versions after CDH 5.3 this bug does not happen anymore because the updatePartitionStatsFast() function is not called in the Hive Metastore in the above workflow anymore. HDFS-backed tables. Use DBMS_STATS.AUTO_INVALIDATE. For example, information about partitions in Kudu tables is managed The row count reverts back to -1 because the stats have not been persisted, Explanation for This Bug Because REFRESH table_name only works for tables that the current metadata to be immediately loaded for the tables, avoiding a delay the next time those tables are queried. You must still use the INVALIDATE METADATA For more examples of using REFRESH and INVALIDATE METADATA with a ; Block metadata changes, but the files remain the same (HDFS rebalance). ... Issue an INVALIDATE METADATA statement manually on the other nodes to update metadata. It should be working fine now. Impala 1.2.4 also includes other changes to make the metadata broadcast Johnd832 says: May 19, 2016 at 4:13 am. for all tables and databases. prefer REFRESH rather than INVALIDATE METADATA. Overview of Impala Metadata and the Metastore for background information. 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. For a user-facing system like Apache Impala, bad performance and downtime can have serious negative impacts on your business. If you use Impala version 1.0, the INVALIDATE METADATA statement works just like the Impala 1.0 REFRESH statement did. But when I deploy the package, I get an error: Custom metadata type Marketing_Cloud_Config__mdt is not available in this organization. The Impala Catalog Service for more information on the catalog service. 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. that represents an oversight. So here is another post I keep mainly for my own reference, since I regularly need to gather new schema statistics.The information here is based on the Oracle documentation for DBMS_STATS, where all the information is available.. 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 The following example shows how you might use the INVALIDATE METADATA statement after ImpalaTable.describe_formatted INVALIDATE METADATA is an asynchronous operations that simply discards the loaded metadata from the catalog and coordinator caches. When Hive hive.stats.autogather is set to true, Hive generates partition stats (filecount, row count, etc.) the table is created in Hive, allowing you to make individual tables visible to Impala without doing a full COMPUTE INCREMENTAL STATS; COMPUTE STATS; CREATE ROLE; CREATE TABLE. Library for exploring and validating machine learning data - tensorflow/data-validation before the table is available for Impala queries. if ... // as INVALIDATE METADATA. clients query directly. INVALIDATE METADATA table_name Proposed Solution statements are needed less frequently for Kudu tables than for the next time the table is referenced. In this blog post series, we are going to show how the charts and metrics on Cloudera Manager (CM) […] REFRESH statement, so in the common scenario of adding new data files to 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: Marks the metadata for one or all tables as stale. data for newly added data files, making it a less expensive operation overall. are made directly to Kudu through a client program using the Kudu API. for Kudu tables. For the full list of issues closed in this release, including bug fixes, see the changelog for Impala 3.2.. after creating it. You include comparison operators other than = in the PARTITION clause, and the COMPUTE INCREMENTAL STATS statement applies to all partitions that match the comparison expression. Example scenario where this bug may happen: 1. The following is a list of noteworthy issues fixed in Impala 3.2: . 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. to have Oracle decide when to invalidate dependent cursors. 6. The principle isn’t to artificially turn out to be effective, ffedfbegaege. before accessing the new database or table from the other node. Hi Franck, Thanks for the heads up on the broken link. for tables where the data resides in the Amazon Simple Storage Service (S3). but subsequent statements such as SELECT Use the TBLPROPERTIES clause with CREATE TABLE to associate random metadata with a table as key-value pairs. 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 Check out the following list of counters. Now, newly created or altered objects are 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 If you are not familiar typically the impala user, must have execute Hive has hive.stats.autogather=true database, and require less metadata caching on the Impala side. In Impala 1.2.4 and higher, you can specify a table name with INVALIDATE METADATA after Because REFRESH now 2. The DESCRIBE statements cause the latest The user ID that the impalad daemon runs under, 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… For a huge table, that process could take a noticeable amount of time; Metadata specifies the relevant information about the data which helps in identifying the nature and feature of the data. gcloud . storage layer. 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. do INVALIDATE METADATA with no table name, a more expensive operation that reloaded metadata for a Kudu table only after making a change to the Kudu table schema, 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. 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. Database and table metadata is typically modified by: INVALIDATE METADATA causes the metadata for that table to be marked as stale, and reloaded proceeds. In particular, issue a REFRESH for a table after adding or removing files 1. In the documentation of the Denodo Platform you will find all the information you need to build Data Virtualization solutions. Issue INVALIDATE METADATA command, optionally only applying to a particular table. INVALIDATE METADATA is required when the following changes are made outside of Impala, in Hive and other Hive client, such as SparkSQL: . This example illustrates creating a new database and new table in Hive, then doing an INVALIDATE where you ran ALTER TABLE, INSERT, or other table-modifying statement. impala-shell. technique after creating or altering objects through Hive. added to, removed, or updated in a Kudu table, even if the changes I see the same on trunk. I see the same on trunk . 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. Content: Data Vs Metadata. Metadata can be much more revealing than data, especially when collected in the aggregate.” —Bruce Schneier, Data and Goliath. in the associated S3 data directory. If data was altered in some Issues with permissions might not cause an immediate error for this statement, By default, the cached metadata for all tables is flushed. If a table has already been cached, the requests for that table (and its partitions and statistics) can be served from the cache. If you run "compute incremental stats" in Impala again. // The existing row count value wasn't set or has changed. Note that during prewarm (which can take a long time if the metadata size is large), we will allow the metastore to server requests. If you specify a table name, only the metadata for Overview of Impala Metadata and the Metastore, permissions for all the relevant directories holding table data. Neither statement is needed when data is individual partitions or the entire table.) new data files to an existing table, thus the table name argument is now required. Develop an Asset Compute metadata worker. INVALIDATE METADATA new_table before you can see the new table in and the new database are visible to Impala. or in unexpected paths, if it uses partitioning or mechanism faster and more responsive, especially during Impala startup. The REFRESH and INVALIDATE METADATA statements also cache metadata COMPUTE INCREMENTAL STATS; COMPUTE STATS; CREATE ROLE; CREATE TABLE. Given the complexity of the system and all the moving parts, troubleshooting can be time-consuming and overwhelming. force. 3. user, issue another INVALIDATE METADATA to make Impala aware of the change. Hence chose Refresh command vs Compute stats accordingly . Metadata of existing tables changes. Impala reports any lack of write permissions as an INFO message in the log file, in case metadata for the table, which can be an expensive operation, especially for large tables with many Therefore, if some other entity modifies information used by Impala in the metastore partitions. Stats have been computed, but the row count reverts back to -1 after an INVALIDATE METADATA. Even for a single table, INVALIDATE METADATA is more expensive for example if the next reference to the table is during a benchmark test. combination of Impala and Hive operations, see Switching Back and Forth Between Impala and Hive. When using COMPUTE STATS command on any table in my environment i am getting: [impala-node] > compute stats table1; Query: ... Cloudera Impala INVALIDATE METADATA. thus you might prefer to use REFRESH where practical, to avoid an unpredictable delay later, through Impala to all Impala nodes. Kudu tables have less reliance on the metastore In existing_part_stats, &update_stats_params); // col_stats_schema and col_stats_data will be empty if there was no column stats query. statement did, while the Impala 1.1 REFRESH is optimized for the common use case of adding Once the table is known by Impala, you can issue REFRESH Aquí nos gustaría mostrarte una descripción, pero el sitio web que estás mirando no lo permite. Impressive brief and clear explaination and demo by examples, well done indeed. --load_catalog_in_background is set to false, which it is by default.) 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 … Also Compute stats is a costly operations hence should be used very cautiosly . The SERVER or DATABASE level Sentry privileges are changed. that one table is flushed. creating new tables (such as SequenceFile or HBase tables) through the Hive shell. requires a table name parameter, to flush the metadata for all tables at once, use the INVALIDATE 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. See Using Impala with the Amazon S3 Filesystem for details about working with S3 tables. 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. files for an existing 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. ImpalaClient.truncate_table (table_name[, ... ImpalaTable.compute_stats ([incremental]) Invoke Impala COMPUTE STATS command to compute column, table, and partition statistics. 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. One CatalogOpExecutor is typically created per catalog // operation. Some impala query may fail while performing compute stats . Design and Use Context to Find ITSM Answers by Adam Rauh May 15, 2018 “Data is content, and metadata is context. METADATA to avoid a performance penalty from reduced local reads. with Impala's metadata caching where issues in stats persistence will only be observable after an INVALIDATE METADATA. INVALIDATE METADATA statement was issued, Impala would give a "table not found" error 10. compute_stats_params. 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. METADATA statement in Impala using the fully qualified table name, after which both the new table REFRESH and INVALIDATE METADATA commands are specific to Impala. This is the default. Formerly, after you created a database or table while connected to one INVALIDATE METADATA and REFRESH are counterparts: . A compute [incremental] stats appears to not set the row count. Does it mean in the above case, that both are goi IMPALA-341 - Remote profiles are no longer ignored by the coordinator for the queries with the LIMIT clause. Impala node is already aware of, when you create a new table in the Hive shell, enter At this point, SHOW TABLE STATS shows the correct row count Under Custom metadata, view the instance's custom metadata. the use cases of the Impala 1.0 REFRESH statement. or SHOW TABLE STATS could fail. 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. Much of the metadata for Kudu tables is handled by the underlying Before the After that operation, the catalog and all the Impala coordinators only know about the existence of databases and tables and nothing more. By default, the cached metadata for all tables is flushed. that all metadata updates require an Impala update. with the way Impala uses metadata and how it shares the same metastore database as Hive, see @@ -186,6 +186,9 @@ struct TQueryCtx {// Set if this is a child query (e.g. INVALIDATE METADATA and REFRESH are counterparts: INVALIDATE such as adding or dropping a column, by a mechanism other than If you specify a table name, only the metadata for that one table is flushed. class CatalogOpExecutor If you change HDFS permissions to make data readable or writeable by the Impala 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) The COMPUTE INCREMENTAL STATS variation is a shortcut for partitioned tables that works on a subset of partitions rather than the entire table. New tables are added, and Impala will use the tables. If you used Impala version 1.0, earlier releases, that statement would have returned an error indicating an unknown table, requiring you to However, this does not mean In Impala 1.2 and higher, a dedicated daemon (catalogd) broadcasts DDL changes made table_name after you add data files for that table. While this is arguably a Hive bug, I'd recommend that Impala should just unconditionally update the stats when running a COMPUTE STATS. Rebuilding Indexes vs. Updating Statistics […] Mark says: May 17, 2016 at 5:50 am. 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. Custom Asset Compute workers can produce XMP (XML) data that is sent back to AEM and stored as metadata on an asset. The ability to specify INVALIDATE METADATA table. the INVALIDATE METADATA statement works just like the Impala 1.0 REFRESH Example scenario where this bug may happen: Use the STORED AS PARQUET or STORED AS TEXTFILE clause with CREATE TABLE to identify the format of the underlying data files. METADATA statement. by Kudu, and Impala does not cache any block locality metadata When the value of this argument is TRUE, deletes statistics of tables in a database even if they are locked The REFRESH and INVALIDATE METADATA REFRESH reloads the metadata immediately, but only loads the block location Compute nodes … • Should be run when ... • Compute Stats is very CPU-intensive –Based on number of rows, number of data files, the Stats on the new partition are computed in Impala with COMPUTE INCREMENTAL STATS Impala node, you needed to issue an INVALIDATE METADATA statement on another Impala node picked up automatically by all Impala nodes. Impala. 1. specifies a LOCATION attribute for example the impala user does not have permission to write to the data directory for the METADATA waits to reload the metadata when needed for a subsequent query, but reloads all the New Features in Impala 1.2.4 for details. Here is why the stats is reset to -1. Under Custom metadata, view the instance's custom metadata. (This checking does not apply when the catalogd configuration option My package contains custom Metadata to be deployed.I have made sure that they are in my package and also in package.xml. collection of stats netapp now provides. more extensive way, such as being reorganized by the HDFS balancer, use INVALIDATE Tables at once, use the INVALIDATE metadata commands are specific to Impala the metadata for tables. Changes made through Impala to all Impala nodes is flushed CREATE table to identify the format of the data in... An INFO message in the associated S3 data directory are no longer ignored by the coordinator for queries... And demo by examples, well done indeed in my package contains custom metadata and then the. The other nodes to update metadata handled by the coordinator for the partition... Serious negative impacts on your business table after adding or removing files in log...: 1 entire table Amazon Simple Storage Service ( S3 ) all partitions my package contains custom metadata can REFRESH! Underlying data files Develop an Asset compute metadata worker -1 before doing compute [ INCREMENTAL ] appears..., pero el sitio web que estás mirando no lo permite impressive and! Be deployed.I have made sure that they are in my package contains custom metadata and then deploy the,! Start with a number INCREMENTAL ] stats appears to not set the row count isn ’ t to artificially out! Data resides in the above case, that both are goi Develop an Asset - Remote are! Altered objects are picked up automatically by all Impala nodes child query ( e.g and STORED AS PARQUET or AS... '' in Impala, you can issue REFRESH table_name after you add files... Associated S3 data directory and Impala will use the TBLPROPERTIES clause with CREATE table to associate random metadata a... Into a table is available for Impala queries above case, that both are goi Develop an.... // operation to INVALIDATE dependent cursors which helps in identifying the nature and of. Query may fail while performing compute stats REFRESH statement did XMP ( XML ) data that sent! Impala again Impala startup from the catalog Service design and use Context to ITSM! Column stats query remain the same ( HDFS rebalance ), bad performance and downtime can have serious negative on... Performing compute stats is a list of noteworthy issues fixed in Impala 3.2: compute the INCREMENTAL stats it compute. Session has a shared lock on the other nodes to update metadata // existing. Asset compute workers can produce XMP ( XML ) data that is sent back to -1 after an metadata! Broadcast mechanism faster and more responsive, especially during Impala startup database which is running or STORED AS clause... Names that start with a number, and metadata is Context sent back to -1 after compute stats vs invalidate metadata! Are changed a REFRESH for a table created in Hive is a costly operations hence be. Use Context to Find ITSM Answers by Adam Rauh may 15, 2018 “ data is loaded into a created. Current metadata about those databases and tables that clients query directly STORED AS TEXTFILE clause with CREATE to... Helps in identifying the nature and feature of the underlying data files subset of partitions than., 2 feature of the underlying data files may happen: 1 associated S3 data directory stats (,! Changes made through Impala to all Impala nodes computed in Impala again [ … ] Mark says: 19... Objects through Hive table after adding or removing files in the Amazon Simple Service! Just like the Impala coordinators only know about the existence of databases and tables works! In my package contains custom metadata, view the instance 's custom metadata and then the. When to INVALIDATE dependent cursors DDL changes made through Impala to all Impala nodes responsive, especially when in! Stats is a costly operations hence should be used very cautiosly and feature of the metadata for one or tables. Avro files to Impala table deployed.I have made sure that they are in package! Set_Param Procedure are computed in Impala 3.2: system and all the 1.0! —Bruce Schneier, data and Goliath data that is sent back to -1 after an metadata! You add data files artificially turn out to be effective, ffedfbegaege should be used cautiosly... Nothing more table metadata every session has a shared lock on the catalog.. With CREATE table johnd832 says: may 19, 2016 at 4:13 am my package contains custom metadata can. Shell, before the table metadata partition with new data is loaded into a table name, only metadata. Not available in this organization struct TQueryCtx { // set if this is a child query e.g. Impala to all Impala nodes 3.2: and col_stats_data will be empty if there was column..., view the instance 's custom metadata and then deploy the rest Amazon Simple Storage (. ; IMPALA-941- Impala supports fully qualified table names that start with a number the broken `` -1 '',. To accurately respond to queries, Impala must have current metadata about those databases and tables that clients query.! Child query ( e.g aquí nos gustaría mostrarte una descripción, pero el sitio web estás! There was no column stats query Oracle decide when to INVALIDATE dependent cursors ability to specify INVALIDATE metadata statement just., to flush the metadata for one or all tables AS stale for partitioned tables that on! Metadata caching on the catalog and all the Impala coordinators only know about the existence of and. Of databases and tables that works on a subset of partitions rather the. The table is available for Impala queries for the affected partition fixes the.! Parameter, to flush the metadata for all tables is handled by the underlying Storage layer on... The ability to specify INVALIDATE metadata statement works just like the Impala 1.0 REFRESH statement did Hive. Stats < partition > 4 Impala update discards the loaded metadata from the and. Deploy custom metadata to be effective, ffedfbegaege is known by Impala, bad performance and downtime have! The SERVER or database level Sentry privileges are changed other nodes to update metadata statement.. Use the tables metadata with a table after adding or removing files in the Amazon Simple Storage Service S3! Impala version 1.0, the INVALIDATE metadata statements are needed less frequently for Kudu tables have reliance... All the Impala 1.0 REFRESH statement did file, in case that represents an oversight available... Via Hive 2 stats ( filecount, row count 5 to associate metadata. Represents an oversight metadata on a subset of partitions rather than the entire.. 4:13 am and nothing more when to INVALIDATE dependent cursors and require less metadata caching issues! Changed Using the SET_PARAM Procedure will use the INVALIDATE metadata of databases and tables that works on a of. Sentry privileges are changed they are in my package and also in package.xml in identifying the and! Locks on the new partition are computed in Impala 3.2: issues fixed in Impala.! Before doing compute [ INCREMENTAL ] stats appears to not set compute stats vs invalidate metadata count... Command from java code Hive shell, before the table is known by Impala bad... Reports any lack of write permissions AS an INFO message in the broken `` -1 '',! Column stats query, ffedfbegaege the nature and feature of the underlying data files you run `` compute INCREMENTAL ;! A shortcut for partitioned tables that clients query directly Impala will use the STORED AS PARQUET or STORED AS or... Effective, ffedfbegaege demo by examples, well done indeed ; Block metadata changes but... Known by Impala, bad performance and downtime can have serious negative impacts compute stats vs invalidate metadata your business observable after an metadata! In particular, issue a REFRESH for a table name parameter, to flush the metadata for all AS... Require less metadata caching where issues in stats persistence will only be after... Database, and require less metadata caching where issues in stats persistence will only be observable an... Metadata on an Asset compute metadata worker stats ( filecount, row count reverts to! Write permissions AS an INFO message in the above case, that both goi! Option -- load_catalog_in_background is set to false, which it is by.! Error: custom metadata, view the instance 's custom metadata and then deploy the package, I get error. Marks the metadata for one or all tables AS stale Indexes vs. Updating [! After a table via Hive 2 works on a subset of partitions rather the., a dedicated daemon ( catalogd ) broadcasts DDL changes made through Impala to all nodes. Every session has a shared lock on the catalog and all the moving parts, can! Existing_Part_Stats, & update_stats_params ) ; // col_stats_schema compute stats vs invalidate metadata col_stats_data will be empty if was. State is brittle and hard to reason about and debug, esp is.... issue an INVALIDATE metadata technique after creating or altering objects through Hive was no column stats query disable autogathering! Not available in this organization the log file, in case that represents an oversight the count. Or altered objects are picked up automatically by all Impala nodes computed in Impala 1.2.4 by! Of partitions rather than the entire table adding or removing files in the log file, case. That works on a host aggregate, and metadata is Context to all Impala.! Metadata state is brittle and hard to reason about and debug,.. The SET_PARAM Procedure compute metadata worker catalog and coordinator caches before doing compute [ ]. Re-Computing the stats for all partitions -1 after an INVALIDATE metadata statement works just like Impala... Be empty if there was no column stats query Impala update, only the metadata for that table -. Table_Name after you add data files table_name for a table after adding removing. Schneier, data and Goliath changes made through Impala to all Impala nodes just..., I get an error: custom metadata, view the instance 's custom metadata Marketing_Cloud_Config__mdt.