A large number of small segment files will lead to low efficiency for scan operations.
Multiple small files can be merged into a large file by compaction operation.
So we could take the tablet scan frequency into consideration when selecting an tablet for compaction
and preferentially do compaction for those tablets which are scanned frequently during a
latest period of time at the present.
Using the compaction strategy of Kudu for reference, scan frequency can be calculated
for tablet during a latest period of time and be taken into consideration when calculating compaction score.
mainly includes:
- `OLAP_SCAN_NODE` profile layering: `OLAP_SCAN_NODE`,`OlapScanner`, and `SegmentIterator`.
- Delete meaningless statistical values. mainly in scan_node.cpp.
- Increase `RowsConditionsFiltered` statistical, split from `RowsDelFiltered`, the meaning is the number of rows filtered by various column indexes, only in segment V2.
- Modify the document based on the above, and enhance readability.
The name and another config name are close to each other and are indistinguishable.
So this pr modify the name.
The document description has also been changed
Support persistence of configuration items modified at runtime via HTTP API.
```
FE:
GET /api/_set_config?key=value&persist=true
BE
POST /api/update_config?key=value&persist=true
```
The modified config will be saved in `fe_custom.conf` or `be_custom.conf`.
And when process starts, it will load `fe.conf/be.conf` first, then `fe_custom.conf/be_custom.conf`.
This is the last PR of proposal #4308
1. Add a new FE config `enable_http_server_v2` to enable new HTTP Server implementation. The default value is false.
2. Add a new FE config `http_api_extra_base_path` so that we can set base path for Frontend UI.
3. Refactor the new HTTP API response body. The return http status code is always 200, and using internal code in response body to indicate the certain error.
Support new synatx CREATE TABLE [IF NOT EXISTS] [db_name].table_name AS [db_name2].table_name2;
to create a new table from existed table with same table schema.
ISSUE: #4355
#4619
Add time_round functions that provides `time_floor` & `time_ceil` at each time unit.
Fix two related bugs.
- #4618
- Fix `struct TimeInterval` to use `int64_t` instead of `int32_t`, in case when the second diff overflow
If some partitions between `dynamic_partition.start` and `dynamic_partition.end` are lost
due to some unexpected circumstances when using dynamic partition.
the lost partitions between the current time and `dynamic_partition.end` will be recreated,
but the lost partitions between `dynamic_partition.start` and the current time will not be recreated.
* [SQL] Support where, limit, order clause in show resourcestmt.
Grammar
SHOW RESOURCES
[
WHERE
[NAME [ = "your_resource_name" | LIKE "name_matcher"]]
[RESOURCETYPE = ["SPARK"]]
]
[ORDER BY ...]
[LIMIT limit][OFFSET offset];
issue #4501
After 0.12 version, doris remove the format convert functiion which can convert from hdr_ format
to tabletmeta_ format when loading metas, the commit link: 3bca253
When we update doris version and there are old format meta in storage,
BE will not read the old format tablet. It can lead to data loss.
So we add meta format detection function to prevent data loss.
When there are old format meta in olap_meta, BE can find and print log or exit.
When Doris create a database, the database of data quota and replica quota is initialized by configuration(Config.default_db_data_quota_bytes and Config.default_db_replica_quota_bytes).
In other words, I convert FeConstants.default_db_data_quota_bytes to Config.default_db_data_quota_bytes
Config.default_db_data_quota_bytes can be change in configuration file.
