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port tidb#17568 to reduce the region error possibility when reading data using coprocessor #65

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Feb 19, 2021
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port tidb#17568 to reduce the region error possibility when reading data using coprocessor #65

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6 changes: 4 additions & 2 deletions src/coprocessor/Client.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -109,14 +109,16 @@ std::vector<copTask> ResponseIter::handle_task_impl(kv::Backoffer & bo, const co

void ResponseIter::handle_task(const copTask & task)
{
kv::Backoffer bo(kv::copNextMaxBackoff);
std::unordered_map<uint64_t, kv::Backoffer> bo_maps;
std::vector<copTask> remain_tasks({task});
size_t idx = 0;
while (idx < remain_tasks.size())
{
try
{
auto new_tasks = handle_task_impl(bo, remain_tasks[idx]);
auto & current_task = remain_tasks[idx];
auto new_tasks
= handle_task_impl(bo_maps.try_emplace(current_task.region_id.id, kv::copNextMaxBackoff).first->second, current_task);
if (new_tasks.size() > 0)
{
remain_tasks.insert(remain_tasks.end(), new_tasks.begin(), new_tasks.end());
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