- 2187 Views
- 1 replies
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- 2187 Views
- 1 replies
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You could have the single node cluster where proxy is installed monitored by one of the tools like cloudwatch, azure monitor, datadog etc and have it configured to send alerts on node failure
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- 1582 Views
- 1 replies
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DBFS root resides in the Customer account or Databricks Account
IF I installed the root Bucket I see a root bucket is created with workspace, Does this bucket resided in Customer account or Databricks Account. How can I Access the bucket and can i see this bucket directly in s3 or ADLS
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- 1 replies
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Didin't get the reference about installing bucket ? did you mean configured a workspace with root bucket. If so, you'd have probably gathered that root storage for a workspace resides in customer's account
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- 5328 Views
- 2 replies
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- 5328 Views
- 2 replies
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Delta cache accelerates data reads by creating copies of remote files in nodes’ local storage using a fast intermediate data format. The data is cached automatically whenever a file has to be fetched from a remote location. Successive reads of the sa...
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- 4234 Views
- 1 replies
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Converting data that is in Delta format to plain parquet format
Many a times there is a need to convert Delta tables from Delta format to plain parquet format for a number of reasons, what is the best way to do that?
- 4234 Views
- 1 replies
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You can easily convert a Delta table back to a Parquet table using the following steps:If you have performed Delta Lake operations that can change the data files (for example, delete or merge, run vacuum with retention of 0 hours to delete all data f...
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- 5879 Views
- 1 replies
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Metaexception [Version information not found in metastore] during cluster [re]start
Trying to configure new external metastore and running into the following exception during cluster initialization - Caused by: MetaException(message:Version information not found in metastore. ) at org.apache.hadoop.hive.metastore.RetryingHMSHandl...
- 5879 Views
- 1 replies
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The above exception happens when the hive schema is not available in the metastore instance. Please check in your init scripts to make sure the following flag is enabled to create hive Schema and tables if not already present. datanucleus.autoCreateA...
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- 1923 Views
- 1 replies
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- 1923 Views
- 1 replies
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The below code snippet can be used to get the DBR details on a HC clusterprint("hadoopVersion:" + sc._gateway.jvm.org.apache.hadoop.util.VersionInfo.getVersion()) print("baseVersion:" + sc._gateway.jvm.org.apache.spark.BuildInfo.sparkBranch()) print(...
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- 1397 Views
- 1 replies
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- 1397 Views
- 1 replies
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Databricks notebooks can be exported and stored in S3 or any other object storage. The internal storage of the databricks notebook cannot be changed or configured. The implementation is internal to Databicks control plane and not user configurable.
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- 3659 Views
- 1 replies
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- 3659 Views
- 1 replies
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The below code snippet is useful to get the modification time of files. %scala import scala.util.Try import org.apache.hadoop.conf.Configuration import org.apache.hadoop.fs.{FileSystem, Path} import org.apache.hadoop.io.IOUtils import java.io.IOExcep...
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- 7238 Views
- 2 replies
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Resolved! How and when to capture the thread dump of the Spark driver?
What is the best way to capture the thread dump of the Spark driver process. Also, when should I capture the thread dump?
- 7238 Views
- 2 replies
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For Spark driver the process is the same. Choose the driver from the Executor page and view the thread dump. A thread dump is the footprints of the JVM they are very useful in debugging issues where the JVM process is stuck or making extremely slow p...
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- 2921 Views
- 2 replies
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Resolved! Autoloader: How to identify the backlog in RocksDB
With S3-SQS it was easier to identify the backlog ( the messages that are fetched from SQS and not consumed by the streaming job) How to find the same with Auto-loader
- 2921 Views
- 2 replies
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For DBR 8.2 or later, the backlog details are captured in the Streaming metricsEg:
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- 3389 Views
- 1 replies
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Resolved! How to ensure that a Databricks Run Submit run invoked from Airflow only runs one time?
I am running jobs on Databricks using the Run Submit API with Airflow. I have noticed that rarely, a particular run is run more than one time at once. Why?
- 3389 Views
- 1 replies
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Idempotency can be ensured by providing the idempotency token. It's easy to pass the same through REST API as mentioned in the below doc:https://kb.databricks.com/jobs/jobs-idempotency.htmlThe primary reason for multiple runs is the client submits t...
- 0 kudos
- 1633 Views
- 1 replies
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Resolved! Performance improvement after running VACUUM commands
How often should I run VACUUM commands? Will running the VACUUM command on a Delta table improve my read/write performance or is it just the storage benefits.
- 1633 Views
- 1 replies
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VACUUM removes uncommitted/stale files from the Storage. The primary benefit is to save the storage cost. Ideally running VACUUM should not show any performance improvement as Delta does not list the storage directories but rather access the files di...
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- 2161 Views
- 1 replies
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Does running OPTIMIZE on a delta table destroy the transaction history of table?
If I run OPTIMIZE on a Delta Lake table, will it prevent me from time travelling to a version before OPTIMIZE was run?
- 2161 Views
- 1 replies
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No, you will still be able to time travel to versions previous to the OPTIMIZE command. OPTIMIZE is just another transaction like MERGE, UPDATE, etc. Check out these docs to learn more about retention periods and the VACUUM command.
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- 2586 Views
- 1 replies
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How do I find the users in workspaces
Looking to pull a list of all the users in their workspaces (including the ones who have never done anything), is there a way to do that? This for AWS
- 2586 Views
- 1 replies
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You can use the SKIM APIs. Endpoint: https://docs.databricks.com/dev-tools/api/latest/scim/scim-users.html#get-users Or you can use the Workspace API. The workspace API does not have a direct list users command, but you can use the workspace API to l...
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- 14977 Views
- 2 replies
- 4 kudos
Resolved! Max Columns for Delta table
Is there an upper limit/recommended max value for no. of columns for Delta table?
- 14977 Views
- 2 replies
- 4 kudos
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Original answer posted by @Gray Gwizdz​ This was a fun question to try and find the answer to! Thank you for that I reviewed some of the most recent issues/bugs reported with Delta Lake and was able to find a similar issue where a user was running i...
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