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https://github.com/ClusterCockpit/cc-metric-store.git
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Jan Eitzinger
GitHub
commit
2bf4ec1744
53
TODO.md
53
TODO.md
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# TODOs
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# Possible Tasks and Improvements
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- Improve checkpoints/archives
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Importance:
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- Store information in each buffer if already archived
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- Do not create new checkpoint if all buffers already archived
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- **I** Important
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- Missing Testcases:
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- **N** Nice to have
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- General tests
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- **W** Won't do. Probably not necessary.
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- Check for corner cases that should fail gracefully
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- Write a more realistic `ToArchive`/`FromArchive` tests
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- Benchmarking
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- Optimization: Once a buffer is full, calculate min, max and avg
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- Benchmark and compare common timeseries DBs with our data and our queries (N)
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- Calculate averages buffer-wise, average weighted by length of buffer
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- Memory management
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- Only the head-buffer needs to be fully traversed
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- To overcome garbage collection overhead: Reimplement in Rust (N)
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- Optimization: If aggregating over hwthreads/cores/sockets cache those results
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- Request memory directly batchwise via mmap (started in branch) (W)
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and reuse some of that for new queres aggregating only over the newer data
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- Archive
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- ...
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- S3 backend for archive (I)
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- Store information in each buffer if already archived (N)
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- Do not create new checkpoint if all buffers already archived (N)
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- Checkpoints
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- S3 backend for checkpoints (I)
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- Combine checkpoints into larger files (I)
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- Binary checkpoints (started in branch) (W)
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- API
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- Redesign query interface (N)
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- Introduce JWT authentication for REST and NATS (I)
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- Testing
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- General tests (I)
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- Test data generator for regression tests (I)
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- Check for corner cases that should fail gracefully (N)
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- Write a more realistic `ToArchive`/`FromArchive` Tests (N)
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- Aggregation
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- Calculate averages buffer-wise as soon as full, average weighted by length of buffer (N)
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- Only the head-buffer needs to be fully traversed (N)
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- If aggregating over hwthreads/cores/sockets cache those results and reuse
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some of that for new queries aggregating only over the newer data (W)
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- Compression
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- Enable compression for http API requests (N)
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- Enable compression for checkpoints/archive (I)
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- Sampling
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- Support data re sampling to reduce data points (I)
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- Use re sampling algorithms that preserve min/max as far as possible (I)
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148
api/openapi.yaml
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api/openapi.yaml
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# OpenAPI spec describing a subset of the HTTP REST API for the cc-metric-store.
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openapi: 3.0.3
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info:
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title: 'cc-metric-store REST API'
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description: 'In-memory time series database for hpc metrics to be used with the [ClusterCockpit](https://github.com/ClusterCockpit) toolsuite'
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version: 0.1.0
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paths:
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'/api/write':
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post:
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operationId: 'writeMetrics'
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description: 'Recieves metrics in the influx line-protocol using [this format](https://github.com/ClusterCockpit/cc-specifications/blob/master/metrics/lineprotocol_alternative.md)'
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parameters:
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- name: cluster
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in: query
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schema: { type: string }
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description: "If the lines in the body do not have a cluster tag, use this value instead."
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requestBody:
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required: true
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content:
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'text/plain':
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example:
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'flops_any,cluster=emmy,hostname=e1001,type=cpu,type-id=0 value=42.0'
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responses:
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200:
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description: 'Everything went fine'
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400:
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description: 'Bad Request'
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'/api/query':
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post:
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operationId: 'queryMetrics'
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description: 'Query metrics'
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requestBody:
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required: true
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content:
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'application/json':
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schema:
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type: object
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required: [cluster, from, to]
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properties:
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cluster:
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type: string
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from:
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type: integer
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to:
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type: integer
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with-stats:
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type: boolean
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default: true
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with-data:
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type: boolean
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default: true
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queries:
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type: array
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items:
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$ref: '#/components/schemas/ApiQuery'
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for-all-nodes:
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description: 'If not null, add a new query for every known host on that cluster and every metric (at node-scope) specified in this array to the request. This can be used to get a metric for every host in a cluster without knowing the name of every host.'
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type: array
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items:
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type: string
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responses:
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200:
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description: 'Requested data and stats as JSON'
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content:
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'application/json':
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schema:
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type: object
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properties:
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queries:
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description: 'Only if for-all-nodes was used, this property exists.'
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results:
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type: array
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description: 'Array where each element is a response to the query at that same index in the request'
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items:
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description: 'If `aggreg` is true, only ever has one element.'
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type: array
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items:
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type: object
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properties:
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error:
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description: 'If not null or undefined, an error happend processing that query'
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type: string
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nullable: true
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data:
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type: array
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items:
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type: number
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nullable: true
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avg: { type: number }
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min: { type: number }
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max: { type: number }
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400:
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description: 'Bad Request'
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'/api/free':
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post:
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operationId: 'freeBuffers'
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description: 'Allow all buffers containing only data older than `to`'
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parameters:
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- name: to
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in: query
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description: 'Unix Timestamp'
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required: true
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schema:
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type: integer
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requestBody:
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required: true
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content:
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'application/json':
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schema:
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type: array
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items:
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type: array
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items:
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type: string
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responses:
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200:
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description: 'Everything went fine'
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400:
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description: 'Bad Request'
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components:
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schemas:
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ApiQuery:
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description: 'A single query for a specific metric resulting in one series'
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type: object
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required: [metric, hostname, aggreg]
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properties:
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metirc:
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type: string
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hostname:
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type: string
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type:
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description: 'Not required for node-level requests. Usually something like socket, cpu or hwthread.'
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type: string
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type-ids:
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type: array
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items:
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type: string
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aggreg:
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type: boolean
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description: 'If true, every query result will have exactly one element. Otherwise, the data for every requested type-id/sub-type-id is provided seperately'
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securitySchemes:
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bearerAuth:
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type: http
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scheme: bearer
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bearerFormat: JWT
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security:
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- bearerAuth: [] # Applies `bearerAuth` globally
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