Aleksandr created IGNITE-27530:
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Summary: Optimize CLI startup time for non-interactive commands
Key: IGNITE-27530
URL: https://issues.apache.org/jira/browse/IGNITE-27530
Project: Ignite
Issue Type: Improvement
Reporter: Aleksandr
h2. Problem
The CLI currently takes ~1.2 seconds to start even for simple commands like
{{--version}} or {{--help}}. This is because it unconditionally initializes:
* Jansi ANSI console (~320ms)
* JLine Terminal for REPL mode (~415ms)
* Full Micronaut DI context
h2. Proposed Solution
Skip Jansi and JLine initialization for non-interactive commands (when args are
provided or stdin/stdout is redirected). This provides a *4x speedup* for
common CLI usage.
h3. Changes:
# *Main.java*: Conditional initialization of Jansi/JLine based on whether we're
entering REPL mode
# *TerminalFactory.java*: Add {{@Lazy}} annotation to defer Terminal creation
# *ReplExecutorProviderImpl.java*: Add {{@Lazy}} annotation
# *application.yml*: Disable eager singleton initialization
# *start.sh*: Add JVM flags {{-XX:TieredStopAtLevel=1}} and {{-XX:+UseSerialGC}}
h2. Expected Results
|| Command || Before || After || Improvement ||
| {{ignite3 --version}} | ~1.2s | ~0.3s | *4x faster* |
| {{ignite3 --help}} | ~1.2s | ~0.3s | *4x faster* |
| REPL mode | ~1.2s | ~1.2s | No change |
h2. Profiling Data
Classes loaded for {{--version}}: 5,472
* JLine Terminal: 415ms (37%)
* Jansi ANSI: 320ms (28%)
* Micronaut DI: 194ms (17%)
* Other: 201ms (18%)
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