ggershinsky commented on code in PR #968:
URL: https://github.com/apache/parquet-mr/pull/968#discussion_r903592957
##########
parquet-hadoop/src/main/java/org/apache/parquet/hadoop/ParquetFileReader.java:
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@@ -126,6 +127,42 @@ public class ParquetFileReader implements Closeable {
public static String PARQUET_READ_PARALLELISM =
"parquet.metadata.read.parallelism";
+ public static int numProcessors = Runtime.getRuntime().availableProcessors();
+
+ // Thread pool to read column chunk data from disk. Applications should call
setAsyncIOThreadPool
+ // to initialize this with their own implementations.
+ // Default initialization is useful only for testing
+ public static ExecutorService ioThreadPool = Executors.newCachedThreadPool(
+ r -> new Thread(r, "parquet-io"));
+
+ // Thread pool to process pages for multiple columns in parallel.
Applications should call
+ // setAsyncProcessThreadPool to initialize this with their own
implementations.
+ // Default initialization is useful only for testing
+ public static ExecutorService processThreadPool =
Executors.newCachedThreadPool(
Review Comment:
given the comment "Default initialization is useful only for testing", maybe
this can be moved to the tests?
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