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joshua-spacetime 36c416ff4e Rotate V8 isolate on heap growth or fragmentation (#4684)
# Description of Changes

While testing #4663, I discovered the server would crash from a V8 out
of memory error after processing many requests. Before #4663, this would
not happen. I theorized that because we now have a single JS worker that
can process an unbounded number of reducer calls over its lifetime, any
V8 heap retention that would previously have been spread across several
pooled isolates now accumulates in one isolate.

This patch now periodically collects heap statistics and forces GC or
replaces the isolate if memory cannot be reclaimed. This greatly reduces
the risk of hitting the V8 heap limit and crashing the server. It
doesn't remove the risk entirely however. But this risk was still
present before we switched to a single worker model in #4663. In order
to remove the risk of crashing the server entirely, we would need to run
V8 in a separate process.

# API and ABI breaking changes

None

# Expected complexity level and risk

3

# Testing

TBD
2026-03-25 21:01:19 +00:00
..
2026-02-20 10:44:29 +00:00
2025-08-12 18:20:58 +00:00

⚠️ Internal Crate ⚠️

This crate is intended for internal use only. It is not stable and may change without notice.