Wei-Chiu Chuang created HDDS-17183:
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Summary: Speed up Ozone CLI
Key: HDDS-17183
URL: https://issues.apache.org/jira/browse/HDDS-17183
Project: Apache Ozone
Issue Type: Epic
Components: Ozone CLI
Reporter: Wei-Chiu Chuang
- *Problem:* Each ozone invocation often takes ~1–2s before useful output; no
systematic profiling has been done. Likely contributors: JVM startup, large
classpath from [.classpath
descriptors|https://github.com/apache/ozone/blob/master/hadoop-ozone/dist/src/shell/ozone/ozone-functions.sh]
(ozone_assemble_classpath → ozone_java_exec), and Java init
([GenericCli|https://github.com/apache/ozone/blob/master/hadoop-hdds/cli-common/src/main/java/org/apache/hadoop/hdds/cli/GenericCli.java]
constructs OzoneConfiguration and picocli up front).
- *Context:* Hadoop 2 CLI felt acceptable; Hadoop 3 / Ozone inherited heavier
Hadoop-style shell + classpath model
([ozone|https://github.com/apache/ozone/blob/master/hadoop-ozone/dist/src/shell/ozone/ozone]
→ artifact names like ozone-cli-shell).
- *Goal:* Measure end-to-end latency, identify dominant phases, then implement
and document mitigations.
- *Out of scope (initially):* OM/SCM RPC time for commands that talk to the
cluster (track separately if profiling shows it dominates for specific
commands).
*Related (link, do not duplicate):*
[HDDS-11825|https://issues.apache.org/jira/browse/HDDS-11825] — interactive CLI
(JLine REPL). Most HDDS-11825 sub-tasks are resolved; open items (e.g. stack
traces) stay on that ticket. This epic focuses on *cold-start / per-invocation
overhead* and *user-facing docs* for interactive mode.
h2. Alternatives and work tracks
These are *alternatives to GraalVM* called out in the epic so task 5 does not
look like an afterthought:
| Approach | Notes |
|
h2. Planned tasks
Profile and benchmark Ozone CLI startup latency
Document interactive Ozone CLI for users
Evaluate GraalVM Native Image for Ozone CLI
POC: Native Image or alternate packaging for one CLI entrypoint
Evaluate JVM and classpath mitigations (non-native)
Operational guidance: faster CLI workflows
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