jinyangli34 commented on code in PR #11258:
URL: https://github.com/apache/iceberg/pull/11258#discussion_r1792875688
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parquet/src/main/java/org/apache/iceberg/parquet/ParquetWriter.java:
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@@ -66,6 +66,9 @@ class ParquetWriter<T> implements FileAppender<T>, Closeable {
private boolean closed;
private ParquetFileWriter writer;
private int rowGroupOrdinal;
+ private long currentRawBufferedSize = 0;
Review Comment:
each row group data has two different sizes:
1. in memory before written (in_memory_size)
2. written as complete row group (written_size)
currentRawBufferedSize: "in_memory" of current unfinished row group
toatalRawBufferedSIze: sum(in_memory for rg in finished_row_groups)
totalRowGroupSize: sum(written for rg in finished_row_groups)
we use (toatalRawBufferedSIze / totalRowGroupSize) ratio to estimate size
change from in-memory to written state.
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