apache / apache/parquet-java

[parquet-java] Intermittent out-of-bounds dictionary ID when reading dictionary-encoded Parquet pages

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Type: bug
主要言語
Java
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平均マージ
3日 12時間
マージ済み PR(30日)
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説明

### Describe the bug, including details regarding any error messages, version, and platform.

## Description

We intermittently encounter a `ParquetDecodingException` when reading Parquet files written by Apache Hudi with Spark.

The issue cannot be reproduced consistently for every write, but it has occurred repeatedly across different write jobs.

The failures have a similar call chain: while reading a dictionary-encoded data page, parquet-java decodes a dictionary ID that is outside the range of the current dictionary. `PlainValuesDictionary` then attempts to access the dictionary array with that ID and throws an `ArrayIndexOutOfBoundsException`.

In the representative case below, the affected column is:

```text
optional int32 chan_second_cate_cd
```

The dictionary contains 13 entries, so the valid dictionary IDs are `0` through `12`. However, the data page produces dictionary ID `14`, resulting in:

```text
java.lang.ArrayIndexOutOfBoundsException: Index 14 out of bounds for length 13
```

This failure occurs in row group `0`, at column value `292293` out of `478848`, and at value `12293` out of `20000` in the current data page.

The value `14` is an internal Parquet dictionary ID, not the actual value stored in the column.

## Environment

| Component | Version |
| --- | --- |
| Apache Hudi | `0.13.1` |
| Write engine | Apache Spark `3.4` |
| parquet-mr | `1.12.3` |

## Representative Stack Trace

Click to expand

```text
org.apache.parquet.io.ParquetDecodingException: Can not read value at 292293 in block 0 in file
at org.apache.parquet.hadoop.InternalParquetRecordReader.nextKeyValue(InternalParquetRecordReader.java:264)
at org.apache.parquet.hadoop.ParquetRecordReader.nextKeyValue(ParquetRecordReader.java:207)
at org.apache.spark.sql.execution.datasources.RecordReaderIterator.hasNext(RecordReaderIterator.scala:39)
at org.apache.spark.sql.execution.datasources.RecordReaderIterator$$anon$1.hasNext(RecordReaderIterator.scala:61)
at org.apache.spark.sql.execution.datasources.FileScanRDD$$anon$1.hasNext(FileScanRDD.scala:125)
at scala.collection.Iterator$$anon$10.hasNext(Iterator.scala:460)
at org.apache.spark.sql.catalyst.expressions.GeneratedClass$GeneratedIteratorForCodegenStage1.processNext(Unknown Source)
at org.apache.spark.sql.execution.BufferedRowIterator.hasNext(BufferedRowIterator.java:43)
at org.apache.spark.sql.execution.WholeStageCodegenExec$$anon$1.hasNext(WholeStageCodegenExec.scala:760)
at org.apache.spark.shuffle.sort.BypassMergeSortShuffleWriter.write(BypassMergeSortShuffleWriter.java:140)
at org.apache.spark.shuffle.ShuffleWriteProcessor.write(ShuffleWriteProcessor.scala:59)
at org.apache.spark.scheduler.ShuffleMapTask.runTask(ShuffleMapTask.scala:101)
at org.apache.spark.scheduler.Task.run(Task.scala:140)
at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:565)

Caused by: org.apache.parquet.io.ParquetDecodingException: Can't read value in column [chan_second_cate_cd] optional int32 chan_second_cate_cd at value 292293 out of 478848, 12293 out of 20000 in currentPage. repetition level: 0, definition level: 1
at org.apache.parquet.column.impl.ColumnReaderBase.readValue(ColumnReaderBase.java:553)
at org.apache.parquet.column.impl.ColumnReaderImpl.readValue(ColumnReaderImpl.java:30)
at org.apache.parquet.column.impl.ColumnReaderBase.writeCurrentValueToConverter(ColumnReaderBase.java:439)
at org.apache.parquet.column.impl.ColumnReaderImpl.writeCurrentValueToConverter(ColumnReaderImpl.java:30)
at org.apache.parquet.io.RecordReaderImplementation.read(RecordReaderImplementation.java:406)
at org.apache.parquet.hadoop.InternalParquetRecordReader.nextKeyValue(InternalParquetRecordReader.java:234)

Caused by: java.lang.ArrayIndexOutOfBoundsException: Index 14 out of bounds for length 13
at org.apache.parquet.column.values.dictionary.PlainValuesDictionary$PlainIntegerDictionary.decodeToInt(PlainValuesDictionary.java:251)
at org.apache.parquet.column.values.dictionary.DictionaryValuesReader.readInteger(DictionaryValuesReader.java:108)
at org.apache.parquet.column.impl.ColumnReaderBase$2$3.read(ColumnReaderBase.java:279)
at org.apache.parquet.column.impl.ColumnReaderBase.readValue(ColumnReaderBase.java:533)
```

### Component(s)

_No response_

コントリビューションガイド

このリポジトリのコントリビューションガイドは索引されていません

調査の方向性

PlainValuesDictionary.decodeToInt、DictionaryValuesReader.readInteger、およびスタックトレースに示されているColumnReaderBaseの呼び出しチェーンから調査を始めてください。辞書エンコードされたページの読み取り中に辞書IDがどのように生成されるかを、報告された13エントリの辞書とID 14を参照ケースとして調査してください。影響を受けるページを辞書の範囲外アクセスなしで読み取ることができ、断続的な失敗が回帰テストでカバーされれば完了です。

索引モデルが issue の本文から書いたものです。

評価

技術スタック
java
領域
data-engineering
issue の種類
バグ
難易度
4/5
見積もり時間
3〜5日
活発さ
静か
明瞭さ
説明が足りない
初心者へのやさしさ
42/100

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