westonpace commented on code in PR #12845:
URL: https://github.com/apache/arrow/pull/12845#discussion_r846429806
##########
cpp/src/arrow/compute/exec/hash_join.cc:
##########
@@ -103,7 +103,8 @@ class HashJoinBasicImpl : public HashJoinImpl {
filter_ = std::move(filter);
output_batch_callback_ = std::move(output_batch_callback);
finished_callback_ = std::move(finished_callback);
- local_states_.resize(num_threads + 1); // +1 for calling thread + worker
threads
+ // Adding ten, since each side of join might have an IO thread being
called from.
Review Comment:
Can you add `TODO(ARROW-15732)` to this comment so we know when to clean it
up?
##########
cpp/src/arrow/compute/exec/hash_join.cc:
##########
@@ -103,7 +103,8 @@ class HashJoinBasicImpl : public HashJoinImpl {
filter_ = std::move(filter);
output_batch_callback_ = std::move(output_batch_callback);
finished_callback_ = std::move(finished_callback);
- local_states_.resize(num_threads + 1); // +1 for calling thread + worker
threads
+ // Adding ten, since each side of join might have an IO thread being
called from.
+ local_states_.resize(num_threads + 10);
Review Comment:
```suggestion
local_states_.resize(GetCpuThreadPoolCapacity() +
io::GetIOThreadPoolCapacity() + 1);
```
This is slightly less arbitrary than 10 and we'd have to be doing something
truly weird to go over this value.
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