pitrou commented on a change in pull request #7172:
URL: https://github.com/apache/arrow/pull/7172#discussion_r425165237
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File path: cpp/src/arrow/io/caching.cc
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@@ -171,7 +171,8 @@ Status ReadRangeCache::Cache(std::vector<ReadRange> ranges)
{
}
impl_->AddEntries(std::move(entries));
- return Status::OK();
+ // Prefetch immediately, regardless of executor availability, if possible
+ return impl_->file->WillNeed(ranges);
Review comment:
`ReadAsync` by default only queues the read for execution in a thread
pool. It doesn't necessarily issue the read immediately. So this might still be
useful, though perhaps only in uninteresting corner cases.
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