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access_time 10 months ago

When creating Spark date frame using schemas, you may encounter errors about “field **: **Type can not accept object ** in type <class '*'>”. The actual error can vary, for instances, the following are some examples: field xxx: BooleanType can not accept object 100 in type ...

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access_time 12 months ago

This page shows how to install Windows Subsystem for Linux (WSL) system on a non-system drive manually. Enable Windows Subsystem for Linux system feature Open PowerShell as Administrator and run the following command to enable WSL feature: Enable-WindowsOptionalFea...

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access_time 11 months ago

In the past months, this website has been using the following Email address to delivery all the notification messages to the website users such as registration confirmation email, comment email and so on. no-reply[at]kontext.tech However, I recently fou...

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local_offer lite-log local_offer hive

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access_time 13 months ago

Since Hive 3.x, new authentication feature for HiveServer2 client is added. When starting HiveServer2 service (Hive version 3.0.0), you may encounter errors like: ‘HiveServer2 metastore.RetryingMetaStoreClient: RetryingMetaStoreClient trying reconnect as [username]  (auth:S...

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local_offer Java local_offer lite-log local_offer hive

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access_time 13 months ago

This post shows you how to connect to HiveServer2 via Hive JDBC driver in Java. *The way to connect to HiveServer1 is very similar though the driver names are different: Version D...

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local_offer lite-log local_offer spark local_offer pyspark

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access_time 2 years ago

In Spark, there are a number of settings/configurations you can specify including application properties and runtime parameters. https://spark.apache.org/docs/latest/configuration.html Ge...

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local_offer lite-log local_offer spark local_offer pyspark local_offer hive

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access_time 2 years ago

Spark 2.x Form Spark 2.0, you can use Spark session builder to enable Hive support directly. The following example (Python) shows how to implement it. from pyspark.sql import SparkSession appName = "PySpark Hive Example" master = "local" # Create Spark session with Hive...

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local_offer python local_offer lite-log local_offer spark local_offer pyspark

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access_time 2 years ago

When running pyspark or spark-submit command in Windows to execute python scripts, you may encounter the following error: PermissionError: [WinError 5] Access is denied As it’s self-explained, permissions are not setup correctly. To resolve this issue y...

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local_offer lite-log local_offer hadoop local_offer hdfs

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access_time 2 years ago

Copy file from HDFS to local Use the following command: hadoop fs [-copyToLocal [-f] [-p] [-ignoreCrc] [-crc] <src> ... <localdst>] For example, copy a file from /hdfs-file.txt in HDFS to local /tmp/ using the following command: ...

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local_offer lite-log local_offer hadoop

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access_time 2 years ago

Solution to fix the issue If you have been running Hadoop on Windows machines, you may encounter issues about unhealthy data nodes. Usually this will happen if there is no enough disk space in your local drive. For example, if I start the HDFS and YARN demons under the context...

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