activity | timestamp | source | source_elapsed
------------------------------------------------------------------------------------------------------+--------------+---------------+----------------
execute_cql3_query | 06:30:52,479 | 192.168.11.23 | 0
Parsing select adid from userlastadevents where userid = '90000012' and type in (1,2,3) LIMIT 10000; | 06:30:52,479 | 192.168.11.23 | 44
Peparing statement | 06:30:52,479 | 192.168.11.23 | 146
Executing single-partition query on userlastadevents | 06:30:52,480 | 192.168.11.23 | 665
Acquiring sstable references | 06:30:52,480 | 192.168.11.23 | 680
Executing single-partition query on userlastadevents | 06:30:52,480 | 192.168.11.23 | 696
Acquiring sstable references | 06:30:52,480 | 192.168.11.23 | 704
Merging memtable tombstones | 06:30:52,480 | 192.168.11.23 | 706
Merging memtable tombstones | 06:30:52,480 | 192.168.11.23 | 721
Bloom filter allows skipping sstable 37398 | 06:30:52,480 | 192.168.11.23 | 758
Bloom filter allows skipping sstable 37426 | 06:30:52,480 | 192.168.11.23 | 762
Bloom filter allows skipping sstable 35504 | 06:30:52,480 | 192.168.11.23 | 768
Bloom filter allows skipping sstable 36671 | 06:30:52,480 | 192.168.11.23 | 771
Merging data from memtables and 0 sstables | 06:30:52,480 | 192.168.11.23 | 777
Merging data from memtables and 0 sstables | 06:30:52,480 | 192.168.11.23 | 780
Executing single-partition query on userlastadevents | 06:30:52,480 | 192.168.11.23 | 782
Acquiring sstable references | 06:30:52,480 | 192.168.11.23 | 791
Read 0 live and 0 tombstoned cells | 06:30:52,480 | 192.168.11.23 | 797
Read 0 live and 0 tombstoned cells | 06:30:52,480 | 192.168.11.23 | 800
Merging memtable tombstones | 06:30:52,480 | 192.168.11.23 | 815
Bloom filter allows skipping sstable 37432 | 06:30:52,480 | 192.168.11.23 | 857
Bloom filter allows skipping sstable 36918 | 06:30:52,480 | 192.168.11.23 | 866
Merging data from memtables and 0 sstables | 06:30:52,480 | 192.168.11.23 | 874
Read 0 live and 0 tombstoned cells | 06:30:52,480 | 192.168.11.23 | 898
Request complete | 06:30:52,479 | 192.168.11.23 | 990
以上是來自cassandra cqlsh的單個查詢的跟蹤輸出,但我並沒有理解一些條目,首先列「source_elapsed」是什麼意思,是否意味着執行特定任務所用的時間或累計到此任務的時間。第二個「時間戳記」不會像「請求完整」時間戳那樣維護時間戳06:30:52,479,但是「合併數據從memtables和0 sstables」是06:30:52,480這是假設較早發生,但時間戳顯示它發生在稍後。什麼是cqlsh跟蹤條目的含義?
看不慣一些活動,以及,
執行單分區查詢 - 並不意味着所有的任務,作爲一個整體還是一個起點?它包括的工作是什麼?爲什麼它重複三次?它是否與複製因素有關?
獲取sstable引用 - 它是什麼意思,它檢查所有sstable的bloom過濾器是否包含我們搜索的特定鍵?然後在「分區索引」的幫助下找到數據文件中的引用。
布隆過濾器允許跳過sstable - 它什麼時候發生?它是如何發生的?它尋找sstable引用的時間是相同的。
請求完成 - 這是什麼意思?是終點線還是需要花費大量時間的工作?
感謝您的回答,我曾經經歷過這些,但無法按照我的預期獲得詳細信息。 但我給你+1 – Zer001