zhannngchen commented on code in PR #14595:
URL: https://github.com/apache/doris/pull/14595#discussion_r1049280771
##########
be/src/common/config.h:
##########
@@ -838,6 +838,9 @@ CONF_Int32(segcompaction_threshold_segment_num, "10");
// The segment whose row number above the threshold will be compacted during
segcompaction
CONF_Int32(segcompaction_small_threshold, "1048576");
+// Enable final-pass segcompaction before commit txn
+CONF_Bool(enable_final_pass_segcompaction, "false");
Review Comment:
We can make it as the default behavior os segment compaction?
##########
be/src/olap/rowset/beta_rowset_writer.cpp:
##########
@@ -552,6 +575,58 @@ Status
BetaRowsetWriter::_segcompaction_ramaining_if_necessary() {
return status;
}
+Status BetaRowsetWriter::_segcompaction_finalpass_wait() {
+ Status status = Status::OK();
+ DCHECK_EQ(_is_doing_segcompaction, false);
+ if (!config::enable_storage_vectorization) {
+ return Status::OK();
+ }
+ if (_segcompaction_status.load() != OLAP_SUCCESS) {
+ return Status::OLAPInternalError(OLAP_ERR_SEGCOMPACTION_FAILED);
+ }
+
+ int64_t num_seg = _is_segcompacted() ? _num_segcompacted : _num_segment;
+ if (num_seg <= FINAL_SEGCOMPACTION_NUM_THRESHOLD) {
+ LOG(INFO) << "num_seg less than max_segment_num_per_rowset, skip final
pass: " << num_seg
+ << " vs " << config::max_segment_num_per_rowset;
+ return Status::OK();
+ }
+
+ // reset num counters for the final segcompaction
+ _num_segment = _num_segcompacted.load();
+ _num_segcompacted = 0;
+ _segcompacted_point = 0;
+
+ _total_row_num_written = 0;
+ {
+ std::lock_guard<std::mutex> lock(_segid_statistics_map_mutex);
+ for (const auto& itr : _segid_statistics_map) {
+ _total_row_num_written += itr.second.row_num;
+ }
+ }
+
+ while (_segcompacted_point != _num_segment) {
+ _is_doing_segcompaction = true;
Review Comment:
no lock protection here?
##########
be/src/olap/rowset/beta_rowset_writer.cpp:
##########
@@ -552,6 +575,58 @@ Status
BetaRowsetWriter::_segcompaction_ramaining_if_necessary() {
return status;
}
+Status BetaRowsetWriter::_segcompaction_finalpass_wait() {
+ Status status = Status::OK();
+ DCHECK_EQ(_is_doing_segcompaction, false);
+ if (!config::enable_storage_vectorization) {
+ return Status::OK();
+ }
+ if (_segcompaction_status.load() != OLAP_SUCCESS) {
+ return Status::OLAPInternalError(OLAP_ERR_SEGCOMPACTION_FAILED);
+ }
+
+ int64_t num_seg = _is_segcompacted() ? _num_segcompacted : _num_segment;
+ if (num_seg <= FINAL_SEGCOMPACTION_NUM_THRESHOLD) {
+ LOG(INFO) << "num_seg less than max_segment_num_per_rowset, skip final
pass: " << num_seg
Review Comment:
How about the case that the data size is quite big, and
`total_size/MAX_SEGMENT_SIZE > FINAL_SEGCOMPACTION_NUM_THRESHOLD`?
##########
be/src/olap/rowset/beta_rowset_writer.cpp:
##########
@@ -400,19 +407,22 @@ Status BetaRowsetWriter::_load_noncompacted_segments(
return Status::OLAPInternalError(OLAP_ERR_ROWSET_LOAD_FAILED);
}
segments->push_back(std::move(segment));
+ if (++segment_num >= FINAL_SEGCOMPACTION_MAX_SEGMENTS) {
+ break;
+ }
}
return Status::OK();
}
/* policy of segcompaction target selection:
- * 1. skip big segments
+ * 1. skip (and rename to keep segment id sequential when necessary) big
segments
* 2. if the consecutive smalls end up with a big, compact the smalls, except
* single small
* 3. if the consecutive smalls end up with small, compact the smalls if the
* length is beyond (config::segcompaction_threshold_segment_num / 2)
*/
Status BetaRowsetWriter::_find_longest_consecutive_small_segment(
- SegCompactionCandidatesSharedPtr segments) {
+ SegCompactionCandidatesSharedPtr segments, size_t small_threshold,
bool is_greedy) {
Review Comment:
Add a comment to explain new parameter `is _greedy`
##########
be/src/olap/rowset/beta_rowset_writer.h:
##########
@@ -127,6 +144,12 @@ class BetaRowsetWriter : public RowsetWriter {
bool _is_segment_overlapping(const std::vector<KeyBoundsPB>&
segments_encoded_key_bounds);
protected:
+ // segment num below will not trigger final segcompaction
+ const uint32_t FINAL_SEGCOMPACTION_NUM_THRESHOLD = 50;
Review Comment:
I think we can merge this 2 const variables to 1
##########
be/src/olap/rowset/beta_rowset_writer.h:
##########
@@ -32,6 +32,18 @@ class FileWriter;
using SegCompactionCandidates = std::vector<segment_v2::SegmentSharedPtr>;
using SegCompactionCandidatesSharedPtr =
std::shared_ptr<SegCompactionCandidates>;
+/* A load process can be divided into: 1) Loading 2) Publishing (Committing
txn)
Review Comment:
Publishing is not equal to committing, they are different phase
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