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3124711fc4
Currently, running the `nodetool compactionhistory` command or using the rest api `curl -X GET --header "Accept: application/json" "http://localhost:10000/compaction_manager/compaction_history"` return compaction history without the `row_merged` field. The series computes rows merged during compaction and provides this information to users via both the nodetool command and the rest api. The `rows_merged` field contains information on merged clustering keys across multiple sstable files. For instance, compacting two sstables of a table consisting of 7 rows where two rows are part of the both sstables, the output would have the following format: {1: 5, 2: 2}. No backport is required. It extends the existing compaction history output. Fixes https://github.com/scylladb/scylladb/issues/666 Closes scylladb/scylladb#20481 * github.com:scylladb/scylladb: test/rest_api: Add tests for compactionhistory nodetool: Add rows merged stats into compactionhistory output compaction: Update compaction history with collected histogram compaction: Remove const qualifier from methods creating sstable readers sstable_set: Add optional statistics to make_local_shard_sstable_reader make_combined_reader: Add optional parameter, combined_reader_statistics reader_selector: Extend with maximum reader count mutation_fragment_merger: Create histogram while consuming mutation fragment batches