[opt](file-cache) support system table file_cache_statistics #39552
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Thank you for your contribution to Apache Doris. Since 2024-03-18, the Document has been moved to doris-website. |
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The test will be added after file cache is enabled in CI pipeline |
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morningman
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Aug 21, 2024
…39552) 1. Add new system table: `file_cache_statistics` This table is used for viewing metrics related to file cache on BE side ``` mysql> select * from information_schema.file_cache_statistics limit 10; +-------+---------------+----------------------------+--------------------------------+--------------------+ | BE_ID | BE_IP | CACHE_PATH | METRIC_NAME | METRIC_VALUE | +-------+---------------+----------------------------+--------------------------------+--------------------+ | 10003 | 172.20.32.136 | /mnt/output/be/file_cache/ | disposable_queue_curr_elements | 0 | | 10003 | 172.20.32.136 | /mnt/output/be/file_cache/ | disposable_queue_curr_size | 0 | | 10003 | 172.20.32.136 | /mnt/output/be/file_cache/ | disposable_queue_max_elements | 102400 | | 10003 | 172.20.32.136 | /mnt/output/be/file_cache/ | disposable_queue_max_size | 21474836480 | | 10003 | 172.20.32.136 | /mnt/output/be/file_cache/ | hits_ratio | 0.8539634687001242 | | 10003 | 172.20.32.136 | /mnt/output/be/file_cache/ | hits_ratio_1h | 0 | | 10003 | 172.20.32.136 | /mnt/output/be/file_cache/ | hits_ratio_5m | 0 | | 10003 | 172.20.32.136 | /mnt/output/be/file_cache/ | index_queue_curr_elements | 0 | | 10003 | 172.20.32.136 | /mnt/output/be/file_cache/ | index_queue_curr_size | 0 | | 10003 | 172.20.32.136 | /mnt/output/be/file_cache/ | index_queue_max_elements | 102400 | +-------+---------------+----------------------------+--------------------------------+--------------------+ ``` It will show metrics of file caches on each BE. 2. Add new metrics `hits_ratio_1h` and `hits_ratio_5m` for file cache This 2 metrics will show the hit ratio of file cache in recent 1 hour or 5 minutes. So that we can know recent hit ratio instead of global historical hit ratio.
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bp #40078