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### What changes were proposed in this pull request? This PR fixes the issue introduced during SPARK-26985. SPARK-26985 changes the `putDoubles()` and `putFloats()` methods to respect the platform's endian-ness. However, that causes the RLE paths in VectorizedRleValuesReader.java to read the RLE entries in parquet as BIG_ENDIAN on big endian platforms (i.e., as is), even though parquet data is always in little endian format. The comments in `WriteableColumnVector.java` say those methods are used for "ieee formatted doubles in platform native endian" (or floats), but since the data in parquet is always in little endian format, use of those methods appears to be inappropriate. To demonstrate the problem with spark-shell: ```scala import org.apache.spark._ import org.apache.spark.sql._ import org.apache.spark.sql.types._ var data = Seq( (1.0, 0.1), (2.0, 0.2), (0.3, 3.0), (4.0, 4.0), (5.0, 5.0)) var df = spark.createDataFrame(data).write.mode(SaveMode.Overwrite).parquet("/tmp/data.parquet2") var df2 = spark.read.parquet("/tmp/data.parquet2") df2.show() ``` result: ```scala +--------------------+--------------------+ | _1| _2| +--------------------+--------------------+ | 3.16E-322|-1.54234871366845...| | 2.0553E-320| 2.0553E-320| | 2.561E-320| 2.561E-320| |4.66726145843124E-62| 1.0435E-320| | 3.03865E-319|-1.54234871366757...| +--------------------+--------------------+ ``` Also tests in ParquetIOSuite that involve float/double data would fail, e.g., - basic data types (without binary) - read raw Parquet file /examples/src/main/python/mllib/isotonic_regression_example.py would fail as well. Purposed code change is to add `putDoublesLittleEndian()` and `putFloatsLittleEndian()` methods for parquet to invoke, just like the existing `putIntsLittleEndian()` and `putLongsLittleEndian()`. On little endian platforms they would call `putDoubles()` and `putFloats()`, on big endian they would read the entries as little endian like pre-SPARK-26985. No new unit-test is introduced as the existing ones are actually sufficient. ### Why are the changes needed? RLE float/double data in parquet files will not be read back correctly on big endian platforms. ### Does this PR introduce _any_ user-facing change? No ### How was this patch tested? All unit tests (mvn test) were ran and OK. Closes #29383 from tinhto-000/SPARK-31703. Authored-by: Tin Hang To <tinto@us.ibm.com> Signed-off-by: Wenchen Fan <wenchen@databricks.com> |
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Apache Spark
Spark is a unified analytics engine for large-scale data processing. It provides high-level APIs in Scala, Java, Python, and R, and an optimized engine that supports general computation graphs for data analysis. It also supports a rich set of higher-level tools including Spark SQL for SQL and DataFrames, MLlib for machine learning, GraphX for graph processing, and Structured Streaming for stream processing.
Online Documentation
You can find the latest Spark documentation, including a programming guide, on the project web page. This README file only contains basic setup instructions.
Building Spark
Spark is built using Apache Maven. To build Spark and its example programs, run:
./build/mvn -DskipTests clean package
(You do not need to do this if you downloaded a pre-built package.)
More detailed documentation is available from the project site, at "Building Spark".
For general development tips, including info on developing Spark using an IDE, see "Useful Developer Tools".
Interactive Scala Shell
The easiest way to start using Spark is through the Scala shell:
./bin/spark-shell
Try the following command, which should return 1,000,000,000:
scala> spark.range(1000 * 1000 * 1000).count()
Interactive Python Shell
Alternatively, if you prefer Python, you can use the Python shell:
./bin/pyspark
And run the following command, which should also return 1,000,000,000:
>>> spark.range(1000 * 1000 * 1000).count()
Example Programs
Spark also comes with several sample programs in the examples
directory.
To run one of them, use ./bin/run-example <class> [params]
. For example:
./bin/run-example SparkPi
will run the Pi example locally.
You can set the MASTER environment variable when running examples to submit
examples to a cluster. This can be a mesos:// or spark:// URL,
"yarn" to run on YARN, and "local" to run
locally with one thread, or "local[N]" to run locally with N threads. You
can also use an abbreviated class name if the class is in the examples
package. For instance:
MASTER=spark://host:7077 ./bin/run-example SparkPi
Many of the example programs print usage help if no params are given.
Running Tests
Testing first requires building Spark. Once Spark is built, tests can be run using:
./dev/run-tests
Please see the guidance on how to run tests for a module, or individual tests.
There is also a Kubernetes integration test, see resource-managers/kubernetes/integration-tests/README.md
A Note About Hadoop Versions
Spark uses the Hadoop core library to talk to HDFS and other Hadoop-supported storage systems. Because the protocols have changed in different versions of Hadoop, you must build Spark against the same version that your cluster runs.
Please refer to the build documentation at "Specifying the Hadoop Version and Enabling YARN" for detailed guidance on building for a particular distribution of Hadoop, including building for particular Hive and Hive Thriftserver distributions.
Configuration
Please refer to the Configuration Guide in the online documentation for an overview on how to configure Spark.
Contributing
Please review the Contribution to Spark guide for information on how to get started contributing to the project.