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Which issue does this PR close?
Closes #2577
Rationale for this change
Celeborn CI can intermittently fail after restoring stale PID files from the binary cache. If a cached PID matches an existing Java process, Celeborn incorrectly reports that its service is already running. This was observed in the Celeborn CI check for PR #2575.
What changes are included in this PR?
Create a fresh directory under
RUNNER_TEMPand exportCELEBORN_PID_DIRbefore starting the master and worker. This bypasses cached PID files and keeps new PID files outside the cached installation.Are there any user-facing changes?
No. This change only affects Celeborn startup in CI.
How was this patch tested?
To be verified by the Celeborn GitHub Actions checks.
Was this patch authored or co-authored using generative AI tooling?
If yes, include:
Generated-by: OpenAI Codex (gpt-6)ASF guidance: https://www.apache.org/legal/generative-tooling.html