David Mollitor created THRIFT-5288: -------------------------------------- Summary: Better Support for ByteBuffer in Compact Protocol Key: THRIFT-5288 URL: https://issues.apache.org/jira/browse/THRIFT-5288 Project: Thrift Issue Type: Improvement Reporter: David Mollitor Assignee: David Mollitor
{code:java|title=TCompactProtocol.java} /** * Write a byte array, using a varint for the size. */ public void writeBinary(ByteBuffer bin) throws TException { int length = bin.limit() - bin.position(); writeBinary(bin.array(), bin.position() + bin.arrayOffset(), length); } {code} I was working on something with Parquet and this code was causing some issues: {code} java.lang.Exception: java.nio.ReadOnlyBufferException at org.apache.hadoop.mapred.LocalJobRunner$Job.runTasks(LocalJobRunner.java:462) at org.apache.hadoop.mapred.LocalJobRunner$Job.run(LocalJobRunner.java:522) Caused by: java.nio.ReadOnlyBufferException at java.nio.ByteBuffer.array(ByteBuffer.java:996) at shaded.parquet.org.apache.thrift.protocol.TCompactProtocol.writeBinary(TCompactProtocol.java:375) at org.apache.parquet.format.InterningProtocol.writeBinary(InterningProtocol.java:135) at org.apache.parquet.format.ColumnIndex$ColumnIndexStandardScheme.write(ColumnIndex.java:945) at org.apache.parquet.format.ColumnIndex$ColumnIndexStandardScheme.write(ColumnIndex.java:820) at org.apache.parquet.format.ColumnIndex.write(ColumnIndex.java:728) at org.apache.parquet.format.Util.write(Util.java:372) at org.apache.parquet.format.Util.writeColumnIndex(Util.java:69) at org.apache.parquet.hadoop.ParquetFileWriter.serializeColumnIndexes(ParquetFileWriter.java:1087) at org.apache.parquet.hadoop.ParquetFileWriter.end(ParquetFileWriter.java:1050) {code} This happens, because not all {{Buffer}}s allow for direct access to the backing Array,... for example a ByteBuffer tied to a file does not have an Array. Read-only (immutable) {{ByteBuffer}s do not allow for this kind of access to the array since it could then be modified. There are two approaches here: # Assert and throw Exception if the backing array must be allowed for access # Make "deal directly" with the ByteBuffer I propose the latter. However, the initial naive I approach I propose is to "deal directly" with the ByteBuffer by making a copy of the contents. -- This message was sent by Atlassian Jira (v8.3.4#803005)