PDiskLogLoad
All VDisks hosted on a certain PDisk log data about their own performance to the common PDisk log. VDisks gradually delete their obsolete data at the beginning of the log to free up disk space. Sometimes, after one VDisk completes logging data and before another one starts logging it, a section with useless obsolete data may appear. In this case, such data is deleted automatically, and the PDiskLogLoad actor will perform a test to check whether such an operation is running correctly.
Note
This ad-hoc actor is used for testing specific functionality. This is not a load actor. It is designed to check whether something works properly.
Actor parameters
The basic actor parameters are described below. For the full list of parameters, see the load_test.proto file in the YDB Git repository.
| Parameter | Description |
|---|---|
PDiskId |
ID of the Pdisk being loaded on the node. |
PDiskGuid |
Globally unique ID of the PDisk being loaded. |
VDiskId |
Parameters of the VDisk used to generate load.
|
MaxInFlight |
Number of simultaneously processed requests. |
SizeIntervalMin |
Minimum size of log record in bytes. |
SizeIntervalMax |
Maximum size of log record in bytes. |
BurstInterval |
Interval between logging sessions in bytes. |
BurstSize |
Total amount of data to log per session, in bytes. |
StorageDuration |
Virtual time in bytes. Indicates how long the VDisk should store its data in the log. |
IsWardenlessTest |
Set it to False in case the PDiskReadLoad actor is run on the cluster; otherwise, e.g. when it is run during unit tests, set it to True. |
Examples
The following actor simulates the performance of two VDisks. The first VDisk logs a message of 65536 bytes every 65536 bytes and deletes data that exceeds 1048576 bytes. The second one writes 1024 bytes as messages of 128 bytes every 2147483647 bytes and deletes data that exceeds 2147483647 bytes.
PDiskLogLoad: {
Tag: 1
PDiskId: 1
PDiskGuid: 12345
DurationSeconds: 60
Workers: {
VDiskId: {GroupID: 1 GroupGeneration: 5 Ring: 1 Domain: 1 VDisk: 1}
MaxInFlight: 1
SizeIntervalMin: 65536
SizeIntervalMax: 65536
BurstInterval: 65536
BurstSize: 65536
StorageDuration: 1048576
}
Workers: {
VDiskId: {GroupID: 2 GroupGeneration: 5 Ring: 1 Domain: 1 VDisk: 1}
MaxInFlight: 1
SizeIntervalMin: 128
SizeIntervalMax: 128
BurstInterval: 2147483647
BurstSize: 1024
StorageDuration: 2147483647
}
IsWardenlessTest: false
}
The test passes if none of the cluster nodes got overloaded and the status of the PDisk in question is Normal. You can check this using the cluster Embedded UI.