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Steve Loughran 7536e2849d [SPARK-20038][SQL] FileFormatWriter.ExecuteWriteTask.releaseResources() implementations to be re-entrant 
## What changes were proposed in this pull request?

have the`FileFormatWriter.ExecuteWriteTask.releaseResources()` implementations  set `currentWriter=null` in a finally clause. This guarantees that if the first call to `currentWriter()` throws an exception, the second releaseResources() call made during the task cancel process will not trigger a second attempt to close the stream.

## How was this patch tested?

Tricky. I've been fixing the underlying cause when I saw the problem [HADOOP-14204](https://issues.apache.org/jira/browse/HADOOP-14204), but SPARK-10109 shows I'm not the first to have seen this. I can't replicate it locally any more, my code no longer being broken.

code review, however, should be straightforward

Author: Steve Loughran <stevel@hortonworks.com>

Closes #17364 from steveloughran/stevel/SPARK-20038-close.
2017-04-13 15:30:44 -05:00
..
catalyst [SPARK-20233][SQL] Apply star-join filter heuristics to dynamic programming join enumeration 2017-04-13 22:27:04 +08:00
core [SPARK-20038][SQL] FileFormatWriter.ExecuteWriteTask.releaseResources() implementations to be re-entrant 2017-04-13 15:30:44 -05:00
hive [SPARK-20303][SQL] Rename createTempFunction to registerFunction 2017-04-12 09:01:26 -07:00
hive-thriftserver [SPARK-18692][BUILD][DOCS] Test Java 8 unidoc build on Jenkins 2017-04-12 12:38:48 +01:00
README.md [SPARK-16557][SQL] Remove stale doc in sql/README.md 2016-07-14 19:24:42 -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.