Improve performance of InternalParquetRecordReader (1%)
Nobody has claimed this yet.
Assessment
- Difficulty
- 2/5
- Estimated time
- 1-3 hours
- Newbie friendliness
- 55/100
- Issue type
- Feature
- Clarity
- Clearly specified
- Activity status
- Stale
- Tech stack
- java
- Domain
- data-engineering, performance
Research direction
Start in parquet-hadoop/src/main/java/org/apache/parquet/hadoop/InternalParquetRecordReader.java at the LongStream around line 323, then review the linked parquet-rowindexiterator benchmark project. Compare the reader's current iteration with the benchmark's Long Iterator approach; done means the reader avoids the reported LongStream overhead while preserving row-index iteration behavior.
Written by the indexing model from the issue text.
Description
Describe the enhancement requested
Profiling the load of a Parquet file with Java Mission Control, I've noticed that InternalParquetRecordReader LongStream consumes relevant amount of time.
This LongStream can be replaced with a simpler Long Iterator that iterates from 0 to pages.getRowCount().
To measure the overhead I've created a test project that overwrites InternalParquetRecordReader implementation with a Long Iterator: https://github.com/jerolba/parquet-rowindexiterator
The execution time is sensitive to the context of the JVM, but running the benchmark multiple times shows that LongStream is slower than LongIterator, between 1% and 4% depending on the run.
Component(s)
No response
- Dominant language
- Java
- Stars
- 3.1k
- Forks
- 1.6k
- Avg merge
- 6d 16h
- Merged PRs (30d)
- 36
Contributor guide
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First steps
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