task_status contains a vector of children identities. If the number
of children is large, we may hit oversized allocation.
Change all types of children-related containers to chunked_vector.
Modify the children type returned from task manager API.
Fixes: scylladb#25795.
Closesscylladb/scylladb#25923
task_stats contains short info about a task. To get a list of task_stats
in the module, one needs to request /task_manager/list_module_tasks/{module}.
To make identification and navigation between tasks easier, extend
task_stats to contain shard, start_time, and end_time.
Closesscylladb/scylladb#22351
In the following patches, get_status won't be unregistering finished
tasks. However, tests need a functionality to drop a task, so that
they could manipulate only with the tasks for operations that were
invoked by these tests.
Add /task_manager/drain/{module} to unregister all finished tasks
from the module. Add respective nodetool command.
Virtual tasks are supported by get_task_status, abort_task and
wait_task.
Task status returned by get_task_status and wait_task:
- contains task_kind to indicate whether it's virtual (cluster) or
regular (node) task;
- children list apart from task_id contains node address of the task.
task_manager/list_module_tasks/{module} starts supporting virtual tasks,
which means that their stats will also be shown for users.
Additional task_kind param is added to indicate whether the task is
virutal (cluster-wide) or regular (node-wide).
Support in other paths will be added in following patches.
Task ttl can be set with task manager test api, which is disabled
in release mode.
Move get_and_update_ttl from task manager test api to task manager
api, so that it can be used in release mode.
Closes#12894
Sometimes to debug some task manager module, we may want to inspect
the whole tree of descendants of some task.
To make it easier, an api call getting a list of statuses of the requested
task and all its descendants in BFS order is added.
It is convenient to create many different tasks implementations
representing more and more specific parts of the operation in
a module. Presenting all of them through the api makes it cumbersome
for user to navigate and track, though.
Flag internal is added to task_manager::task::impl so that the tasks
could be filtered before they are sent to user.
The task manager api layer. It can be used to list the modules
registered in task_manager, list tasks belonging to the given
module, abort, wait for or retrieve a status of the given task.
