Created Apart from data you need to tune on few spark parameters. Maybe you need to increase the minimum yarn container size a bit? overhead(is that mean memory overhead is not part of the executor Cluster with x nodes? The executors will run in yarn containers. The value of the property can be changed at any time and will be respected in the next build. Even if you would ask for more than this 27, he will only be capable of providing 27.

Created The UI timeline still shows the start of only 2 excutors while the environment tab num.excutors=10 as set. separate? Consider boosting spark.yarn.executor.memoryOverhead. Why is the US residential model untouchable and unquestionable? Why does KLM offer this specific combination of flights (GRU -> AMS -> POZ) just on one day when there's a time change? If executor memory is 15 GB, then only one executor would run (15 GB + 2 GB = 17 GB *2 is more than 32 GB).In lab testing, we find the value of the property should generally be set to 10-20% of the executor memory as an optimal setting. What would the ancient Romans have called Hercules' Club? Default value:2048 - 2 GB will be allocated to each Spark executor as the off-heap memory. To my understanding, yarn should let the users define the number of executors and build the cluster accordingly.

Hello, I need your advice regarding what seems like a strange behavior in the cluster I'm using. I will forward the reply to my colleagues and will test the configuration proposed once I get back to the office. Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. assuming 12*5 = 60 and total memory 116*5 = 580GB is what total resources available .. then you tune other parameters correspondingly,,, How APIs can take the pain out of legacy system headaches (Ep. Connection: If the property is set at the connection then the property value is applicable for all dataset build, cube build, or data profile jobs launched using Spark. Is there a suffix that means "like", or "resembling"? Created 01:54 PM. 04:20 AM. spark-submit, will it take default 18.75 or it won't? 21/07/29 10:43:54 WARN YarnAllocator: Container killed by YARN for exceeding memory limits. CDP Operational Database (COD) supports CDP Control Planes for multiple regions. 2)why does he not provide the number of executors that you request? The distance between two continuous functions is a continuous function. Resource manager launches containers in order to execute executors inside it.

and executor memory overhead includes offheap memory and buffers and memory for running container-specific threads. so basically executor memory + memory overhead = container memory .. spark have break up for executor memory into application memory and cache memory. Created on If you enter 5g, Kyvos picks it as 5 GB. Beware: unlike spark.executor.memory where values like 3g are permitted, the value for spark.yarn.executor.memoryOverhead must always be an integer, in megabytes. What happens if I didn't mention overhead as part of the Note that your administrator may need to perform this change.

I see 2 things that would be good to understand: 1)why do the yarn containers exceed their size. when you do not specify memory overhead, Resource manager calculates memory overhead value by using default values and launch containers accordingly. For more information about how to set Spark settings, please see Spark configurations. ERR_RECIPE_CANNOT_CHECK_SCHEMA_CONSISTENCY_ON_RECIPE_TYPE: Cannot check schema consistency on this kind of recipe, ERR_RECIPE_CANNOT_CHECK_SCHEMA_CONSISTENCY_WITH_RECIPE_CONFIG: Cannot check schema consistency because of recipe configuration, ERR_RECIPE_CANNOT_CHANGE_ENGINE: Not compatible with Spark, ERR_RECIPE_CANNOT_USE_ENGINE: Cannot use the selected engine for this recipe, ERR_RECIPE_ENGINE_NOT_DWH: Error in recipe engine: SQLServer is not Data Warehouse edition, ERR_RECIPE_INCONSISTENT_I_O: Inconsistent recipe input or output, ERR_RECIPE_SYNC_AWS_DIFFERENT_REGIONS: Error in recipe engine: Redshift and S3 are in different AWS regions, ERR_RECIPE_PDEP_UPDATE_REQUIRED: Partition dependecy update required, ERR_RECIPE_SPLIT_INVALID_COMPUTED_COLUMNS: Invalid computed column, ERR_SCENARIO_INVALID_STEP_CONFIG: Invalid scenario step configuration, ERR_SECURITY_CRUD_INVALID_SETTINGS: The user attributes submitted for a change are invalid, ERR_SECURITY_GROUP_EXISTS: The new requested group already exists, ERR_SECURITY_INVALID_NEW_PASSWORD: The new password is invalid, ERR_SECURITY_INVALID_PASSWORD: The password hash from the database is invalid, ERR_SECURITY_MUS_USER_UNMATCHED: The DSS user is not configured to be matched onto a system user, ERR_SECURITY_PATH_ESCAPE: The requested file is not within any allowed directory, ERR_SECURITY_USER_EXISTS: The requested user for creation already exists, ERR_SECURITY_WRONG_PASSWORD: The old password provided for password change is invalid, ERR_SPARK_FAILED_DRIVER_OOM: Spark failure: out of memory in driver, ERR_SPARK_FAILED_TASK_OOM: Spark failure: out of memory in task, ERR_SPARK_FAILED_YARN_KILLED_MEMORY: Spark failure: killed by YARN (excessive memory usage), ERR_SPARK_PYSPARK_CODE_FAILED_UNSPECIFIED: Pyspark code failed, ERR_SPARK_SQL_LEGACY_UNION_SUPPORT: Your current Spark version doesnt support UNION clause but only supports UNION ALL, which does not remove duplicates, ERR_SQL_CANNOT_LOAD_DRIVER: Failed to load database driver, ERR_SQL_DB_UNREACHABLE: Failed to reach database, ERR_SQL_IMPALA_MEMORYLIMIT: Impala memory limit exceeded, ERR_SQL_POSTGRESQL_TOOMANYSESSIONS: too many sessions open concurrently, ERR_SQL_TABLE_NOT_FOUND: SQL Table not found, ERR_SQL_VERTICA_TOOMANYROS: Error in Vertica: too many ROS, ERR_SQL_VERTICA_TOOMANYSESSIONS: Error in Vertica: too many sessions open concurrently, ERR_SYNAPSE_CSV_DELIMITER: Bad delimiter setup, ERR_TRANSACTION_FAILED_ENOSPC: Out of disk space, ERR_TRANSACTION_GIT_COMMMIT_FAILED: Failed committing changes, ERR_USER_ACTION_FORBIDDEN_BY_PROFILE: Your user profile does not allow you to perform this action, INFO_RECIPE_POTENTIAL_FAST_PATH: Potential fast path configuration, INFO_RECIPE_IMPALA_POTENTIAL_FAST_PATH: Potential Impala fast path configuration, WARN_RECIPE_SPARK_INDIRECT_HDFS: No direct access to read/write HDFS dataset, WARN_RECIPE_SPARK_INDIRECT_S3: No direct access to read/write S3 dataset, ERR_DASHBOARD_EXPORT_SAND_BOXING_ERROR: Chrome cannot start in the sandbox mode. "Selected/commanded," "indicated," what's the third word? whether memory overhead is part of the executor memory or it's 465), Design patterns for asynchronous API communication. Thanks for the detailed follow up. Your suggestion that I'm not getting the executors requested as the "cluster is not capable of providing the requested 10 executors of 8GB" is an option my client should check.

If you request a 8GB executor, and there is some (2GB)overhead, he might hit the ceiling of what was assigned to him and this executor will exit. around 100GB out of 120GB, not sure if we can use more than that. You can change your calculation like below mentioned 07-30-2021

rev2022.7.21.42639. Can you think of any reason why the cluster may "choose" to reduce the number of executors to set up? 07-30-2021 The value forspark.executor.memory+ spark.executor.memoryOverhead should not be more than what a YARN container can support. 08-12-2021 08:26 PM. I will let him know. 01:35 AM. The remediation is to increase the value of spark.yarn.executor.memoryOverhead Spark setting.

Created {"serverDuration": 202, "requestCorrelationId": "35cc8160a9051edb"}. By default, the memory overhead is 10% of executor memory (with a minimum of 384 MB). Suppose 10 GB on each node is allocated to yarn. Suppose you have 9 nodes. However, after going through multiple blogs, I got confused. And also check you have enabled dynamic allocation or not. 08-11-2021 How can I use parentheses when there are math parentheses inside? This value is often not enough. (4:12). Kyvos delegates this property value to the same-named property of Spark when Kyvos submits a dataset build, cube build, or data profile job to Spark. This might also be a bottleneck. 12:03 AM, My client is a Cloudera customer. It seems like you are exceeding the yarn container size of 10GB. the executor memory and others are saying executor memory + memory 08-10-2021

As few of the blogs are saying memory overhead is part of 10.0 GB of 10 GB physical memory used. Making statements based on opinion; back them up with references or personal experience. To answer your question whether memory overhead is part of the executor memory or it's separate?

When a Spark application starts on YARN, it tells YARN how much memory it will use at maximum. The Interleaving Effect: How widely is this used? YARN accordingly reserves this amount of memory. bash loop to replace middle of string after a certain character, Laymen's description of "modals" to clients. 08-12-2021 Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, whether memory overhead is part of the executor memory or it's separate? How did this note help previous owner of this old film camera? Running Spark (2.4, Cloudera) on Yarn the configuration calls the set up of 10 executors: However, the UI/ yarn logs show the start of only 2 executors, with a third starting at a later stage, to replace the second: 21/07/29 10:44:01 INFO Executor: Starting executor ID 3 on host . Description:This property specifies the amount of off-heap memory per executor when jobs are executed using Spark. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. By default, the values are in MB, to enter the value in GB, add a g at the end, and Kyvos will pick the value in GB. Thanks for contributing an answer to Stack Overflow! This error can happen when running any Spark-enabled recipe, when Spark is running in YARN deployment mode. Values and behavior:Any positive integer over 384. so basically executor memory + memory overhead = container memory .. spark have breakage for executor memory in to application memory and cache memory. Skipping a calculus topic (squeeze theorem). yes in resource manager launches containers in order to execute executors inside that. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy.

The calculations involve shuffle operaions (as reducedByKey) but since the dataset size in not fixed I don't see how I can use a fixed estimateshuffle input size in calculatingspark.sql.shuffle.partitions. Memory Overhead is not part of executor memory. If you are a cloudera customer, please create the case we will work on this issue. Thanks for the detailed reply. NOTE: If the property is set on a dataset and a dataset is built, then the value will override the connection level value for that dataset build job. 08-12-2021 12 * 5 = 60cores and total memory 116 * 5 = 580GB is what total resources available .. then you tune other parameters correspondingly. Build the input dataset first. CDP Operational Database (COD) supports Multiple Availability Zones (Multi-AZ) on AWS.

The application is set up to run on datasets of diverse sizes but I was able to reduce the load for calculating the large ones by changes to the code. Maybe you can try reduce these a bit? I will forward your suggestion to them so they'll be able to discuss further in the case they'll open with Cloudera (I'm not their data engineer).

Story: man purchases plantation on planet, finds 'unstoppable' infestation, uses science, electrolyses water for oxygen, 1970s-1980s. As per the below video, I'm trying to use 85% of the node i.e. 08-12-2021 For example, if you enter the value as 5120, Kyvos picks it as 5120 MB. This property comes into effect only when.

I'll return with more info once we tested the configuration you proposed. What are the purpose of the extra diodes in this peak detector circuit (LM1815)? Executor memory overhead mainly includes off-heap memory and nio buffers and memory for running container-specific threads(thread stacks). Should I remove older low level jobs/education from my CV at this point? It really depends on what kind of cluster you have available.It depends on following paramaters: 1)cloudera manager-> yarn-> configuration ->yarn.nodemanager.resource.memory-mb (=Amount of physical memory, in MiB, that can be allocated for containers=all memory that yarn can use on 1 worker node), 2)yarn.scheduler.minimum-allocation-mb (container memmory minimum= every container will request this much memory), 3)yarn.nodemanager.resource.cpu-vcores (Container Virtual CPU Cores). For this property, the Spark applications should be running on YARN, which means Spark must be deployed in cluster mode. Dataset: If the property is set on a dataset then the value will override cube level value for that cubes dataset build job. Memory overhead and off-heap over are the same? Find centralized, trusted content and collaborate around the technologies you use most.

The memory issues wouldn't have emerge had the application set the number of executors requested. Are shrivelled chilis safe to eat and process into chili flakes? 08-01-2021 I noticed you really are requesting a lot of cores too. Created The value of the property can be changed at any time and will be respected in the next build. 12:51 AM.

You are viewing the documentation for version, Automation scenarios, metrics, and checks, ERR_BUNDLE_ACTIVATE_CONNECTION_NOT_WRITABLE: Connection is not writable, ERR_CODEENV_CONTAINER_IMAGE_FAILED: Could not build container image for this code environment, ERR_CODEENV_CONTAINER_IMAGE_TAG_NOT_FOUND: Container image tag not found for this Code environment, ERR_CODEENV_CREATION_FAILED: Could not create this code environment, ERR_CODEENV_DELETION_FAILED: Could not delete this code environment, ERR_CODEENV_EXISTING_ENV: Code environment already exists, ERR_CODEENV_INCORRECT_ENV_TYPE: Wrong type of Code environment, ERR_CODEENV_INVALID_CODE_ENV_ARCHIVE: Invalid code environment archive, ERR_CODEENV_JUPYTER_SUPPORT_INSTALL_FAILED: Could not install Jupyter support in this code environment, ERR_CODEENV_JUPYTER_SUPPORT_REMOVAL_FAILED: Could not remove Jupyter support from this code environment, ERR_CODEENV_MISSING_DEEPHUB_ENV: Code environment for deep learning does not exist, ERR_CODEENV_MISSING_ENV: Code environment does not exists, ERR_CODEENV_MISSING_ENV_VERSION: Code environment version does not exists, ERR_CODEENV_NO_CREATION_PERMISSION: User not allowed to create Code environments, ERR_CODEENV_NO_USAGE_PERMISSION: User not allowed to use this Code environment, ERR_CODEENV_NOT_USING_LATEST_DEEPHUB_ENV: Not using latest version of code environment for deep learning, ERR_CODEENV_UNSUPPORTED_OPERATION_FOR_ENV_TYPE: Operation not supported for this type of Code environment, ERR_CODEENV_UPDATE_FAILED: Could not update this code environment, ERR_CONNECTION_ALATION_REGISTRATION_FAILED: Failed to register Alation integration, ERR_CONNECTION_API_BAD_CONFIG: Bad configuration for connection, ERR_CONNECTION_AZURE_INVALID_CONFIG: Invalid Azure connection configuration, ERR_CONNECTION_DUMP_FAILED: Failed to dump connection tables, ERR_CONNECTION_INVALID_CONFIG: Invalid connection configuration, ERR_CONNECTION_LIST_HIVE_FAILED: Failed to list indexable Hive connections, ERR_CONNECTION_S3_INVALID_CONFIG: Invalid S3 connection configuration, ERR_CONNECTION_SQL_INVALID_CONFIG: Invalid SQL connection configuration, ERR_CONNECTION_SSH_INVALID_CONFIG: Invalid SSH connection configuration, ERR_CONTAINER_CONF_NO_USAGE_PERMISSION: User not allowed to use this containerized execution configuration, ERR_CONTAINER_CONF_NOT_FOUND: The selected container configuration was not found, ERR_CONTAINER_IMAGE_PUSH_FAILED: Container image push failed, ERR_DATASET_ACTION_NOT_SUPPORTED: Action not supported for this kind of dataset, ERR_DATASET_CSV_UNTERMINATED_QUOTE: Error in CSV file: Unterminated quote, ERR_DATASET_HIVE_INCOMPATIBLE_SCHEMA: Dataset schema not compatible with Hive, ERR_DATASET_INVALID_CONFIG: Invalid dataset configuration, ERR_DATASET_INVALID_FORMAT_CONFIG: Invalid format configuration for this dataset, ERR_DATASET_INVALID_METRIC_IDENTIFIER: Invalid metric identifier, ERR_DATASET_INVALID_PARTITIONING_CONFIG: Invalid dataset partitioning configuration, ERR_DATASET_PARTITION_EMPTY: Input partition is empty, ERR_DATASET_TRUNCATED_COMPRESSED_DATA: Error in compressed file: Unexpected end of file, ERR_ENDPOINT_INVALID_CONFIG: Invalid configuration for API Endpoint, ERR_FOLDER_INVALID_PARTITIONING_CONFIG: Invalid folder partitioning configuration, ERR_FSPROVIDER_CANNOT_CREATE_FOLDER_ON_DIRECTORY_UNAWARE_FS: Cannot create a folder on this type of file system, ERR_FSPROVIDER_DEST_PATH_ALREADY_EXISTS: Destination path already exists, ERR_FSPROVIDER_FSLIKE_REACH_OUT_OF_ROOT: Illegal attempt to access data out of connection root path, ERR_FSPROVIDER_HTTP_CONNECTION_FAILED: HTTP connection failed, ERR_FSPROVIDER_HTTP_INVALID_URI: Invalid HTTP URI, ERR_FSPROVIDER_HTTP_REQUEST_FAILED: HTTP request failed, ERR_FSPROVIDER_ILLEGAL_PATH: Illegal path for that file system, ERR_FSPROVIDER_INVALID_CONFIG: Invalid configuration, ERR_FSPROVIDER_INVALID_FILE_NAME: Invalid file name, ERR_FSPROVIDER_LOCAL_LIST_FAILED: Could not list local directory, ERR_FSPROVIDER_PATH_DOES_NOT_EXIST: Path in dataset or folder does not exist, ERR_FSPROVIDER_ROOT_PATH_DOES_NOT_EXIST: Root path of the dataset or folder does not exist, ERR_FSPROVIDER_SSH_CONNECTION_FAILED: Failed to establish SSH connection, ERR_HIVE_HS2_CONNECTION_FAILED: Failed to establish HiveServer2 connection, ERR_HIVE_LEGACY_UNION_SUPPORT: Your current Hive version doesnt support UNION clause but only supports UNION ALL, which does not remove duplicates, ERR_METRIC_DATASET_COMPUTATION_FAILED: Metrics computation completely failed, ERR_METRIC_ENGINE_RUN_FAILED: One of the metrics engine failed to run, ERR_ML_MODEL_DETAILS_OVERFLOW: Model details exceed size limit, ERR_ML_VERTICA_NOT_SUPPORTED: Vertica ML backend is no longer supported, ERR_NOT_USABLE_FOR_USER: You may not use this connection, ERR_OBJECT_OPERATION_NOT_AVAILABLE_FOR_TYPE: Operation not supported for this kind of object, ERR_PLUGIN_CANNOT_LOAD: Plugin cannot be loaded, ERR_PLUGIN_COMPONENT_NOT_INSTALLED: Plugin component not installed or removed, ERR_PLUGIN_DEV_INVALID_COMPONENT_PARAMETER: Invalid parameter for plugin component creation, ERR_PLUGIN_DEV_INVALID_DEFINITION: The descriptor of the plugin is invalid, ERR_PLUGIN_INVALID_DEFINITION: The plugins definition is invalid, ERR_PLUGIN_NOT_INSTALLED: Plugin not installed or removed, ERR_PLUGIN_WITHOUT_CODEENV: The plugin has no code env specification, ERR_PLUGIN_WRONG_TYPE: Unexpected type of plugin, ERR_PROJECT_INVALID_ARCHIVE: Invalid project archive, ERR_PROJECT_INVALID_PROJECT_KEY: Invalid project key, ERR_PROJECT_UNKNOWN_PROJECT_KEY: Unknown project key, ERR_RECIPE_CANNOT_CHANGE_ENGINE: Cannot change engine, ERR_RECIPE_CANNOT_CHECK_SCHEMA_CONSISTENCY: Cannot check schema consistency, ERR_RECIPE_CANNOT_CHECK_SCHEMA_CONSISTENCY_EXPENSIVE: Cannot check schema consistency: expensive checks disabled. If, during runtime, the memory usage (per container) goes above this limit, YARN kills the process for breaching its promise.

Asking for help, clarification, or responding to other answers. 08-13-2021 I've tried the configuration you provided with dynamic allocation enabled. All rights reserved. - edited

03:47 AM.

Many thanks for your help, Created on This property comes into effect only set as Spark. Connect and share knowledge within a single location that is structured and easy to search. When a Spark application runs on YARN, it requests YARN containers with an amount of memory computed as: spark.executor.memory + spark.yarn.executor.memoryOverhead, spark.executor.memory is the amount of Java memory (Xmx) that Spark executors will get. To set shuffle value we will use below calculation: spark.sql.shuffle.partitions = shuffle input size/ hdfs block size. - edited memory)? 04:03 AM. This means when the underlying build engine is set as Spark. Announcing the Stacks Editor Beta release! 01:57 AM. Grep excluding line that ends in 0, but not 10, 100 etc. 08:57 AM Apache Spark Effects of Driver Memory, Executor Memory, Driver Memory Overhead and Executor Memory Overhead on success of job runs. Created How to set executor number by memory in YARN mode? As prior configurations worked well, following intensive tests on datasets of various kinds, I prefer not to apply dynamic allocation if that is not absolutely necessary. 2022 Kyvos Insights.

08:59 AM.

The issue was encountered by other colleagues and I encountered it only lately. I think the message suggests the minimum container size for yarn is 10GB. The resource manager calculates memory overhead value by using default values if not mentioned explicitly. Total Cores 16 * 5 = 80 Total Memory 120 * 5 = 600GB you should always keep aside cores and memory for OS which is running on that node and 1 core for nodemanager and 1 core for other daemons and 2 cores for OS to work optimally. Will there be any side effects if we give more memory overhead than the default value? Maybe you are still asking more than what is available? Created To learn more, see our tips on writing great answers. Spark memory overhead related question asked multiple times in SO, I went through most of them., Below is the case I want to understand. Suppose your executor memory is 1GB . It is always recommended to keep aside cores and memory for OS (which is 1 core for nodemanager and 1 core for other daemons and 2 cores for OS to work optimally). THerefore, when dynamic allocation is enabled, he will start 27 execuctors. Other relevant info to share would be: how many nodes do you have, and for each node, how much memory is assigned to yarn , and how much is the yarn minimum container size?Example: suppose the yarn container size is 3 GB. You haven't shared what is your dataset size.

Apart from above if you are doing any kind of wide operation shuffle is involved. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. Any internal yarn/other configuration I should examine? Cube: If the property is set on a cube, then the value will override the connection level value for that cubes build job. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. This error indicates that YARN (the resource manager) has forcefully killed the Spark components, because they ran above their allocated memory allocation. Find answers, ask questions, and share your expertise. Recommendation: Memory cannot be shared across nodes.

Spark cluster: Launched executors less than specified. 07-29-2021 Just adding that I double checked with reduced excutors number and memory: but the excutor still starts only 2 exceutors. Looks like your cluster is not capable of providing the requested 10 executors of 8GB? 08-12-2021 However, Java processes always consume a bit more memory, which is accounted for by spark.yarn.executor.memoryOverhead. 4)how many worker nodes? You can open Spark UI --> Select Application --> Go to the Environment page --> find spark.dynamicallocation.enabled property. I have 5 nodes with each node 16 vcores and 128GB Memory(out of which 120 is usable), now I want to submit spark application, below is the conf, I'm thinking, case 1: Memory Overhead part of the executor memory, Case 2: Memory Overhead not part of the executor memory. for example, shuffle input size is 10GB and hdfs block size is 128 MB then shuffle partitions is 10GB/128MB = 80 partitions.

If a node has 32 GB of memory, then setting this property to 2 GB and executor memory to 13 GB will allow 2 executors to run on this node. Spark cluster: Launched executors less than specif yarn.nodemanager.resource.memory-mb (=Amount of physical memory, in MiB, that can be allocated for containers=all memory that yarn can use on 1 worker node), yarn.scheduler.minimum-allocation-mb (container memmory minimum= every container will request this much memory), CDP Public Cloud Release Summary: June 2022, Cloudera DataFlow for the Public Cloud 2.1 introduces in-place upgrades as a Technical Preview feature. We generally recommend setting a value between 500 and 1000. This means you have on each node enough memory to start 3 containers (3x3GB< 10GB). Spark 2 on YARN is utilizing more cluster resource automatically, Spark 2.2 fails with more memory or workers, succeeds with very little memory and few workers, Pyspark - DataFrame persist() errors out java.lang.OutOfMemoryError: GC overhead limit exceeded, Spark Executors PODS in Pending State on Kubernetes Deployment, Spark off heap memory expanding with caching, Tannakian-type reconstruction of etale fundamental group. Created Thanks again for the tips but please let me know how can I coerece the set up of a specific number of executors in the cluster or which internal configuration I should look into to fix this issue. 01:32 AM ERR_RECIPE_CANNOT_CHECK_SCHEMA_CONSISTENCY_NEEDS_BUILD: Cannot compute output schema with an empty input dataset.

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