HappenLee commented on a change in pull request #3405:
URL: https://github.com/apache/incubator-doris/pull/3405#discussion_r416316769
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File path: be/src/exec/olap_scan_node.cpp
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@@ -702,8 +694,13 @@ Status OlapScanNode::start_scan_thread(RuntimeState*
state) {
state, this, _olap_scan_node.is_preaggregation,
_need_agg_finalize, *scan_range, scanner_ranges);
_scanner_pool->add(scanner);
_olap_scanners.push_back(scanner);
+
+ if (disk_set.find(scanner->scan_disk()) == disk_set.end()) {
+ disk_set.insert(scanner->scan_disk());
+ }
}
}
+ COUNTER_SET(_num_disks_accessed_counter,
static_cast<int64_t>(disk_set.size()));
Review comment:
We can know whether the tablet of a query is allocated on different
disks to know whether is IO bottleneck in disk
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