HDDS-15586. Add freon command to read a user-supplied list of existing keys#10529
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HDDS-15586. Add freon command to read a user-supplied list of existing keys#10529greenwich wants to merge 1 commit into
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What changes were proposed in this pull request?
HDDS-15586 Add freon command to read a user-supplied list of existing keys
Discussed and supported on the community forum: #10460
There is no freon command that points at an arbitrary, heterogeneous set of existing keys (a real dataset already in a bucket) and measures read throughput. This is needed for read-path
performance and capacity/scaling work, where freshly generated uniform keys are page-cache-hot and not representative of production data.
Add a freon subcommand OzoneClientKeyListReader (ocklr) that:
takes --key-file <path>— a local file with one key name per line; blank lines and # comments ignored;BaseFreonGenerator— a warm sharedOzoneClient,-tthreads,-ntotal reads (task i reads keys[i % keys.size()], so -n loops the list), DropWizard timer;bucket.readKey(key), drains the stream into a fixed buffer and counts bytes (no content/digest assumptions); reports the key-read timer plus an aggregate bytes/wall-timeMB/s line.
What is the link to the Apache JIRA
https://issues.apache.org/jira/browse/HDDS-15586
How was this patch tested?
Unit tests are committed too.