Ashin Gau 30c21789c8 [opt](filecache) use weak_ptr to cache the file handle of file segment (#21975) ...

Use weak_ptr to cache the file handle of file segment. The max cached number of file handles can be configured by `file_cache_max_file_reader_cache_size`, default `1000000`.
Users can inspect the number of cached file handles by request BE metrics: `http://be_host:be_webserver_port/metrics`:
```
# TYPE doris_be_file_cache_segment_reader_cache_size gauge
doris_be_file_cache_segment_reader_cache_size{path="/mnt/datadisk1/gaoxin/file_cache"} 2500
```

2023-07-24 19:09:27 +08:00

..

cache

[opt](filecache) use weak_ptr to cache the file handle of file segment (#21975)

2023-07-24 19:09:27 +08:00

fs

[improvement](hdfs) add parquet footer cache and hdfs file handle cache (#20544)

2023-06-13 15:13:57 +08:00