Adam Hooper created ARROW-10033: ----------------------------------- Summary: ArrowReaderProperties creates thread pool, even when use_threads=False and pre_buffer=False Key: ARROW-10033 URL: https://issues.apache.org/jira/browse/ARROW-10033 Project: Apache Arrow Issue Type: Bug Components: C++ Affects Versions: 1.0.1 Reporter: Adam Hooper
`ArrowReaderProperties` has a `::arrow::io::AsyncContext async_context_;` member. Its ctor creates a thread pool. Stack trace: ``` #0 arrow::internal::ThreadPool::ThreadPool (this=0x232fa90) at /src/apache-arrow-1.0.1/cpp/src/arrow/util/thread_pool.cc:121 #1 0x00000000008e4747 in arrow::internal::ThreadPool::Make (threads=8) at /src/apache-arrow-1.0.1/cpp/src/arrow/util/thread_pool.cc:246 #2 0x00000000008e48c9 in arrow::internal::ThreadPool::MakeEternal (threads=8) at /src/apache-arrow-1.0.1/cpp/src/arrow/util/thread_pool.cc:252 #3 0x00000000008a20ac in arrow::io::internal::MakeIOThreadPool () at /src/apache-arrow-1.0.1/cpp/src/arrow/io/interfaces.cc:326 #4 0x00000000008a21dd in arrow::io::internal::GetIOThreadPool () at /src/apache-arrow-1.0.1/cpp/src/arrow/io/interfaces.cc:334 #5 0x00000000008a064f in arrow::io::AsyncContext::AsyncContext ( this=0xea6bb0 <parquet::default_arrow_reader_properties()::default_reader_props+80>) at /src/apache-arrow-1.0.1/cpp/src/arrow/io/interfaces.cc:49 #6 0x000000000048893e in parquet::ArrowReaderProperties::ArrowReaderProperties ( this=0xea6b60 <parquet::default_arrow_reader_properties()::default_reader_props>, use_threads=false) at /src/apache-arrow-1.0.1/cpp/src/parquet/properties.h:579 #7 0x00000000005e1b98 in parquet::default_arrow_reader_properties () at /src/apache-arrow-1.0.1/cpp/src/parquet/properties.cc:53 #8 0x0000000000414843 in parquet::arrow::FileReaderBuilder::FileReaderBuilder (this=0x7fffb31f0c60) at /src/apache-arrow-1.0.1/cpp/src/parquet/arrow/reader.cc:930 #9 0x0000000000414b10 in parquet::arrow::OpenFile (file=..., pool=0xea6cf0 <arrow::jemalloc_pool>, reader=0x7fffb31f0e08) at /src/apache-arrow-1.0.1/cpp/src/parquet/arrow/reader.cc:957 ``` As a caller, I expect `use_threads=False` to prevent the creation of threads. (Maybe there should be an exception if `pre_buffer && !use_threads`?) -- This message was sent by Atlassian Jira (v8.3.4#803005)