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https://issues.apache.org/jira/browse/HDDS-1094?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16913161#comment-16913161
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Supratim Deka commented on HDDS-1094:
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yes, I understand. exactly why I said earlier, depends on what we wish to test.
with this patch, we are trying to enable system level tests - the data path
(not just the Datanodes) together with the metadata components. while the 3
sections you list are subsystem scope and are required as well. With this
change, we should be able to run system performance tests without investing in
beefy storage hardware.
Btw, in HDFS world there is very similar functionality in the form of
SimulatedFSDataset.
> Performance test infrastructure : skip writing user data on Datanode
> --------------------------------------------------------------------
>
> Key: HDDS-1094
> URL: https://issues.apache.org/jira/browse/HDDS-1094
> Project: Hadoop Distributed Data Store
> Issue Type: Improvement
> Components: Ozone Datanode
> Reporter: Supratim Deka
> Assignee: Supratim Deka
> Priority: Major
> Labels: pull-request-available
> Time Spent: 1h 10m
> Remaining Estimate: 0h
>
> Goal:
> Make Ozone chunk Read/Write operations CPU/network bound for specially
> constructed performance micro benchmarks.
> Remove disk bandwidth and latency constraints - running ozone data path
> against extreme low-latency & high throughput storage will expose performance
> bottlenecks in the flow. But low-latency storage(NVME flash drives, Storage
> class memory etc) is expensive and availability is limited. Is there a
> workaround which achieves similar running conditions for the software without
> actually having the low latency storage? At least for specially constructed
> datasets - for example zero-filled blocks (*not* zero-length blocks).
> Required characteristics of the solution:
> No changes in Ozone client, OM and SCM. Changes limited to Datanode, Minimal
> footprint in datanode code.
> Possible High level Approach:
> The ChunkManager and ChunkUtils can enable writeChunk for zero-filled chunks
> to be dropped without actually writing to the local filesystem. Similarly, if
> readChunk can construct a zero-filled buffer without reading from the local
> filesystem whenever it detects a zero-filled chunk. Specifics of how to
> detect and record a zero-filled chunk can be discussed on this jira. Also
> discuss how to control this behaviour and make it available only for internal
> testing.
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