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Temporary Tables A table that has been created as a temporary table will only be visible to the current session. Data will be stored in the user’s scr
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posted @ 2026-01-13 17:41
ZhangZhihuiAAA
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In Hive, a Skewed Table is a special type of table designed to handle "data skew"—a situation where one or two specific values appear much more freque
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posted @ 2026-01-13 17:30
ZhangZhihuiAAA
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In HiveQL, the primary difference between ORDER BY and SORT BY lies in how many reducers are used and whether the entire dataset is guaranteed to be s
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posted @ 2026-01-13 16:46
ZhangZhihuiAAA
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How not to show the INFO messages in beeline? To silence INFO messages in Beeline and keep your output clean (showing only errors or query results), y
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posted @ 2026-01-13 16:08
ZhangZhihuiAAA
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An ORC (Optimized Row Columnar) file is a self-describing, type-aware columnar storage format designed for Hadoop workloads. Originally created for Ap
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posted @ 2026-01-12 21:39
ZhangZhihuiAAA
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Apache Avro is an open-source data serialization system used primarily in big data ecosystems like Hadoop and Kafka. It transforms complex data struct
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posted @ 2026-01-11 19:16
ZhangZhihuiAAA
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Overview HCatalog is a table and storage management layer for Hadoop that enables users with different data processing tools — Pig, MapReduce — to mor
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posted @ 2026-01-11 15:33
ZhangZhihuiAAA
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https://hive.apache.org/docs/latest/language/languagemanual-variablesubstitution/ Using Variables There are three namespaces for variables – hiveconf,
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posted @ 2026-01-11 10:50
ZhangZhihuiAAA
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https://hive.apache.org/docs/latest/language/languagemanual-commands/ set: -- For hiveconf variables set my_var=; -- For hivevar variables set hivevar
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posted @ 2026-01-11 10:47
ZhangZhihuiAAA
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frank@ZZHPC:~/download$ wget https://dlcdn.apache.org/spark/spark-4.1.1/spark-4.1.1-bin-hadoop3.tgz frank@ZZHPC:~/download$ tar -xzf spark-4.1.1-bin-h
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posted @ 2026-01-09 22:16
ZhangZhihuiAAA
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