compute stats vs invalidate metadata

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

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