apache/parquet-java

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Apache Parquet Java

Stars: 3.1k
Forks: 1.6k
Open beginner issues: 0
Indexed issues: 580
Avg merge: 3d 12h
Merged PRs (30d): 33

Dominant language: Java
License: Apache-2.0
Last GitHub push: Sep 17, 2026
Latest indexed: Sep 14, 2026
Contributing guide: No contributing guide
Code of conduct: Code of conduct
Beginner labels: good first issue

Beginner friendly Everything

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580 open issues indexed

Make compression adaptive with V2 data pages Open

Good first issue Type: enhancement

Difficulty 3/5 1-2 days Newbie friendliness 42/100

apache/parquet-java#3344 · 3 comments · Opened Oct 8, 2025
Throw typed exception for Parquet footer error Open

Type: enhancement

Difficulty 2/5 1-3 hours Newbie friendliness 52/100

apache/parquet-java#3342 · Opened Oct 2, 2025
Hadoop parquet reader (and parquet-CLI) fails on some files from parquet-testing Open

Type: bug

Difficulty 4/5 3-5 days Newbie friendliness 48/100

apache/parquet-java#3336 · 4 comments · Opened Sep 26, 2025
ParquetWriter is incompatible with JDK25 Open

Type: bug

Difficulty 4/5 3-5 days Newbie friendliness 38/100

apache/parquet-java#3328 · 4 comments · 2 reactions · Opened Sep 24, 2025
BIT_PACKING is written by default when Definition or Repetition levels are empty Open

Type: bug

Difficulty 2/5 1-3 hours Newbie friendliness 48/100

apache/parquet-java#3307 · 6 comments · Opened Sep 6, 2025
End to end tests for Parquet CLI Open

Type: enhancement

Difficulty 4/5 3-5 days Newbie friendliness 42/100

apache/parquet-java#3289 · Opened Aug 29, 2025
Improve Parquet documentation Open

Type: enhancement

Difficulty 5/5 Over a week Newbie friendliness 30/100

apache/parquet-java#3284 · 3 comments · Opened Aug 28, 2025
Support complete encryption metadata in CLI Open

Type: enhancement

Difficulty 4/5 3-5 days Newbie friendliness 42/100

apache/parquet-java#3282 · Opened Aug 25, 2025
Decouple Hadoop/Native I/O implementations Open

Type: enhancement

Difficulty 5/5 Over a week Newbie friendliness 25/100

apache/parquet-java#3279 · 1 comment · 5 reactions · Opened Aug 25, 2025
Persist write configuration to parquet files Open

Type: enhancement

Difficulty 4/5 3-5 days Newbie friendliness 42/100

apache/parquet-java#3277 · Opened Aug 24, 2025
Fix Todos/Tests throughout the codebase Open

Type: enhancement

Difficulty 5/5 Over a week Newbie friendliness 15/100

apache/parquet-java#3267 · Opened Aug 15, 2025
`integer overflow` in CapacityByteArrayOutputStream Open

Type: bug

Difficulty 3/5 1-2 days Newbie friendliness 55/100

apache/parquet-java#3261 · 6 comments · Opened Aug 5, 2025
ParquetFileWriter in invalid state after network outage in end(metadata) Open

Type: bug

Difficulty 5/5 Over a week Newbie friendliness 35/100

apache/parquet-java#3254 · 4 comments · Opened Jul 17, 2025
Improve Export performance Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

apache/parquet-java#3248 · Opened Jul 10, 2025
Is big Decimal in Parquet big endian? Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

apache/parquet-java#3246 · 4 comments · Opened Jun 27, 2025
Emit and Read min/max statistics for int96 timestamp columns Open

Type: enhancement

Difficulty 4/5 3-5 days Newbie friendliness 38/100

apache/parquet-java#3242 · 3 comments · Opened Jun 12, 2025
Buffers allocated by ParquetFileReader.readVectored() are not being released Open

Type: bug

Difficulty 3/5 1-2 days Newbie friendliness 35/100

apache/parquet-java#3237 · 1 comment · Opened Jun 4, 2025
No need to read full RowGroup when using RowRanges Open

Type: enhancement

Difficulty 4/5 3-5 days Newbie friendliness 45/100

apache/parquet-java#3231 · 1 comment · Opened May 30, 2025
Inaccurate Thrift Installation Instructions on README Open

Type: bug

Difficulty 2/5 1-3 hours Newbie friendliness 55/100

apache/parquet-java#3228 · 2 reactions · Opened May 27, 2025
Improve performance of InternalParquetRecordReader (1%) Open

Type: enhancement

Difficulty 2/5 1-3 hours Newbie friendliness 55/100

apache/parquet-java#3226 · Opened May 25, 2025
Make the order of encodings in column metadata deterministic Open

Type: enhancement

Difficulty 2/5 1-3 hours Newbie friendliness 58/100

apache/parquet-java#3215 · Opened May 15, 2025
sun.misc.Unsafe usage in Zero-Allocation-Hashing will be deprecated - what is Parquet's plan? Open

Type: bug

Difficulty 5/5 Over a week Newbie friendliness 30/100

apache/parquet-java#3185 · 2 comments · Opened Apr 9, 2025
Review Parquet site front page Open

Difficulty 2/5 1-3 hours Newbie friendliness 45/100

apache/parquet-java#3176 · Opened Mar 13, 2025
InternalParquetRecordWriter flushRowGroupToStore not actually writing to file Open

Type: bug

Difficulty 3/5 1-2 days Newbie friendliness 45/100

apache/parquet-java#3171 · 5 comments · Opened Mar 12, 2025
Reading fails when using DirectCodecFactory Open

Type: bug

Difficulty 4/5 3-5 days Newbie friendliness 45/100

apache/parquet-java#3150 · Opened Feb 8, 2025
`MessageTypeParser.parseMessageType()` Fails to Parse Valid Parquet Schemas with Special Characters in Field Names Open

Type: bug

Difficulty 3/5 1-2 days Newbie friendliness 45/100

apache/parquet-java#3145 · 3 comments · Opened Feb 6, 2025
ExampleParquetWriter may write illegal values for uint_8 and uint_16 Open

Type: bug

Difficulty 3/5 1-2 days Newbie friendliness 45/100

apache/parquet-java#3142 · 2 comments · Opened Jan 31, 2025
High Memory Usage and Long GC Times When Writing Parquet Files Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

apache/parquet-java#3102 · 3 comments · Opened Dec 10, 2024
parquet-cli reports nested columns as null Open

Type: bug

Difficulty 3/5 1-2 days Newbie friendliness 35/100

apache/parquet-java#3095 · Opened Dec 3, 2024
Use FixedSizeBinary instead of Binary for int96 conversion when convertInt96ToArrowTimestamp is false Open

Type: enhancement

Difficulty 2/5 1-3 hours Newbie friendliness 45/100

apache/parquet-java#3088 · 2 comments · 1 reaction · Opened Nov 29, 2024
Required field 'num_values' was not found in serialized data! Open

Type: bug

Difficulty 5/5 Over a week Newbie friendliness 20/100

apache/parquet-java#3084 · 2 comments · Opened Nov 28, 2024
Make DELTA_LENGTH_BYTE_ARRAY default encoding for binary values Open

Type: enhancement

Difficulty 4/5 3-5 days Newbie friendliness 48/100

apache/parquet-java#3083 · Opened Nov 27, 2024
HadoopStreams to support ByteBufferPositionedReadable input streams Open

Type: enhancement

Difficulty 3/5 1-2 days Newbie friendliness 48/100

apache/parquet-java#3080 · 1 comment · Opened Nov 26, 2024
should not use seek() for skipping very small column chunks. better to read and ignore data. Open

Type: enhancement

Difficulty 4/5 3-5 days Newbie friendliness 45/100

apache/parquet-java#3076 · 4 comments · Opened Nov 23, 2024
read footer using 1 call readFully(byte[8]) instead of 5 calls ( 4 x read() for footer length + 1 x read(byte[4]) for magic marker ) Open

Type: enhancement

Difficulty 2/5 1-3 hours Newbie friendliness 55/100

apache/parquet-java#3074 · Opened Nov 23, 2024
Inconsistency between vectorized processing boundary calculation in benchmark and readBatchUsing512Vector calculation method in ParquetReadRouter class? Open

Difficulty 4/5 3-5 days Newbie friendliness 38/100

apache/parquet-java#3073 · Opened Nov 22, 2024
Write truncated parquet footer Open

Type: bug

Difficulty 4/5 3-5 days Newbie friendliness 32/100

apache/parquet-java#3069 · Opened Nov 18, 2024
Include FAPEC compressor support to Parquet? Open

Type: enhancement

Difficulty 5/5 Over a week Newbie friendliness 25/100

apache/parquet-java#3067 · 1 comment · Opened Nov 18, 2024
Is it possible to apply specific encodings on specific columns with ParquetWriter? Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

apache/parquet-java#3051 · 1 comment · Opened Nov 7, 2024
Cannot read parquet file that was generated from nanoparquet Open

Type: bug

Difficulty 4/5 3-5 days Newbie friendliness 35/100

apache/parquet-java#3043 · 1 comment · Opened Nov 6, 2024
ProtoSchemaConverter renders invalid schema for oneof in unwrap mode Open

Type: bug

Difficulty 3/5 1-2 days Newbie friendliness 45/100

apache/parquet-java#3039 · Opened Oct 31, 2024
Could we provide a potentially larger InternalParquetRecordWriter.getDataSize Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

apache/parquet-java#3032 · 1 comment · Opened Oct 11, 2024
Pure Java NIO LocalInputFile Implementation Open

Type: enhancement

Difficulty 4/5 3-5 days Newbie friendliness 35/100

apache/parquet-java#3028 · 1 comment · 3 reactions · Opened Oct 7, 2024
ParquetMetadataConverter should never log at level WARN Open

Type: bug

Difficulty 4/5 3-5 days Newbie friendliness 35/100

apache/parquet-java#3025 · Opened Oct 7, 2024
Make ParquetFileReader extensible Open

Type: enhancement

Difficulty 4/5 3-5 days Newbie friendliness 42/100

apache/parquet-java#3006 · 11 comments · Opened Aug 30, 2024
[Packaging] Add Parquet BOM Open

Type: enhancement

Difficulty 4/5 3-5 days Newbie friendliness 25/100

apache/parquet-java#3004 · Opened Aug 29, 2024
How To Build Source Code in Windows 11 with intellij Open

Difficulty 2/5 1-3 hours Newbie friendliness 20/100

apache/parquet-java#3003 · 1 comment · Opened Aug 28, 2024
Add `BytesInput.fromInts(int[] integers)` Open

Type: enhancement

Difficulty 2/5 1-3 hours Newbie friendliness 45/100

apache/parquet-java#2997 · Opened Aug 22, 2024
Only call hsync() and hflush() on supported filesystems Open

Type: enhancement

Difficulty 4/5 3-5 days Newbie friendliness 35/100

apache/parquet-java#2990 · Opened Aug 13, 2024
MINOR: updated document of parquet-avro (#2914) Open

Difficulty 4/5 3-5 days Newbie friendliness 30/100

apache/parquet-java#2982 · Opened Aug 9, 2024

apache/parquet-java

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