MINOR: Reader fails fast when footer size is larger than INT_MAX#3136
Merged
wgtmac merged 1 commit intoapache:masterfrom Mar 5, 2025
Merged
MINOR: Reader fails fast when footer size is larger than INT_MAX#3136wgtmac merged 1 commit intoapache:masterfrom
wgtmac merged 1 commit intoapache:masterfrom
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@dylanburati I have tried to support the footer with an unsigned int size in Java implementation. However, due to some limitations, it can not be done. We could write a footer(without encrypted) size larger than Int.MaxValue bytes, while we can not read it due to some limitations in thrift. java.io.IOException: can not read class org.apache.parquet.format.FileMetaData: MaxMessageSize reached
at org.apache.parquet.format.Util.read(Util.java:393)
at org.apache.parquet.format.Util.readFileMetaData(Util.java:156)
at org.apache.parquet.format.converter.ParquetMetadataConverter$3.visit(ParquetMetadataConverter.java:1545)
at org.apache.parquet.format.converter.ParquetMetadataConverter$3.visit(ParquetMetadataConverter.java:1542)
at org.apache.parquet.format.converter.ParquetMetadataConverter$NoFilter.accept(ParquetMetadataConverter.java:1242)
at org.apache.parquet.format.converter.ParquetMetadataConverter.readParquetMetadata(ParquetMetadataConverter.java:1542)
at org.apache.parquet.hadoop.ParquetFileReader.readFooter(ParquetFileReader.java:637)
at org.apache.parquet.hadoop.ParquetFileReader.readFooter(ParquetFileReader.java:571)
Caused by: org.apache.thrift.transport.TTransportException: MaxMessageSize reached
at org.apache.thrift.transport.TEndpointTransport.checkReadBytesAvailable(TEndpointTransport.java:94)
at org.apache.thrift.protocol.TCompactProtocol.checkStringReadLength(TCompactProtocol.java:726)
at org.apache.thrift.protocol.TCompactProtocol.readString(TCompactProtocol.java:675)
at org.apache.parquet.format.InterningProtocol.readString(InterningProtocol.java:269)
at org.apache.parquet.format.KeyValue$KeyValueStandardScheme.read(KeyValue.java:415)
at org.apache.parquet.format.KeyValue$KeyValueStandardScheme.read(KeyValue.java:392)
at org.apache.parquet.format.KeyValue.read(KeyValue.java:327)
at org.apache.parquet.format.FileMetaData$FileMetaDataStandardScheme.read(FileMetaData.java:1338)Since it is a rare condition. Here we just fail fast with an exception. cc @wgtmac |
ConeyLiu
commented
Jan 24, 2025
| LOG.debug("reading footer index at {}", fileMetadataLengthIndex); | ||
| f.seek(fileMetadataLengthIndex); | ||
| int fileMetadataLength = readIntLittleEndian(f); | ||
| long readFileMetadataLength = readIntLittleEndian(f) & 0xFFFFFFFFL; |
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read as a unsigned int
wgtmac
approved these changes
Mar 4, 2025
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Thanks @wgtmac |
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Rationale for this change
The footer size is limited to unsigned int for some other language implementations, such as Rust. However, it is limited to Int.MaxValue on the Java side due to some limitations(eg, lack of unsigned int supports, the biggest byte array/buffer is limited to Int.MaxValue). So this PR reads the footer size as long and fails fast if it is larger than Int.MaxValue.
What changes are included in this PR?
Are these changes tested?
Existed UTs.
Are there any user-facing changes?
No