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Shixiong Zhu 282f00b410 [SPARK-21696][SS] Fix a potential issue that may generate partial snapshot files 
## What changes were proposed in this pull request?

Directly writing a snapshot file may generate a partial file. This PR changes it to write to a temp file then rename to the target file.

## How was this patch tested?

Jenkins.

Author: Shixiong Zhu <shixiong@databricks.com>

Closes #18928 from zsxwing/SPARK-21696.
2017-08-14 15:06:55 -07:00
..
catalyst [MINOR][SQL] Additional test case for CheckCartesianProducts rule 2017-08-13 21:33:16 -07:00
core [SPARK-21696][SS] Fix a potential issue that may generate partial snapshot files 2017-08-14 15:06:55 -07:00
hive [SPARK-21699][SQL] Remove unused getTableOption in ExternalCatalog 2017-08-10 18:56:25 -07:00
hive-thriftserver [SPARK-21637][SPARK-21451][SQL] get spark.hadoop.* properties from sysProps to hiveconf 2017-08-05 17:30:47 -07:00
create-docs.sh [SPARK-21485][SQL][DOCS] Spark SQL documentation generation for built-in functions 2017-07-26 09:38:51 -07:00
gen-sql-markdown.py [SPARK-21485][FOLLOWUP][SQL][DOCS] Describes examples and arguments separately, and note/since in SQL built-in function documentation 2017-08-05 10:10:56 -07:00
mkdocs.yml [SPARK-21485][SQL][DOCS] Spark SQL documentation generation for built-in functions 2017-07-26 09:38:51 -07:00
README.md [SPARK-21485][SQL][DOCS] Spark SQL documentation generation for built-in functions 2017-07-26 09:38:51 -07:00

README.md

Spark SQL

This module provides support for executing relational queries expressed in either SQL or the DataFrame/Dataset API.

Spark SQL is broken up into four subprojects:

  • Catalyst (sql/catalyst) - An implementation-agnostic framework for manipulating trees of relational operators and expressions.
  • Execution (sql/core) - A query planner / execution engine for translating Catalyst's logical query plans into Spark RDDs. This component also includes a new public interface, SQLContext, that allows users to execute SQL or LINQ statements against existing RDDs and Parquet files.
  • Hive Support (sql/hive) - Includes an extension of SQLContext called HiveContext that allows users to write queries using a subset of HiveQL and access data from a Hive Metastore using Hive SerDes. There are also wrappers that allows users to run queries that include Hive UDFs, UDAFs, and UDTFs.
  • HiveServer and CLI support (sql/hive-thriftserver) - Includes support for the SQL CLI (bin/spark-sql) and a HiveServer2 (for JDBC/ODBC) compatible server.

Running sql/create-docs.sh generates SQL documentation for built-in functions under sql/site.