He-Pin opened a new pull request, #3145:
URL: https://github.com/apache/pekko/pull/3145
### Motivation
Manual per-byte hex encoding with `"%02x".format()` is verbose and allocates
a `String` per byte. JDK 17's `HexFormat` formats entire byte arrays in one
call with zero intermediate allocations.
### Modification
- `VectorClock.scala`: Replace `digester.digest.map("%02x".format).mkString`
with `HexFormat.of().formatHex(digester.digest())`
- `TcpFraming.scala`: Replace `.map("%02x".format).mkString(" ")` with
`HexFormat.ofDelimiter(" ").formatHex(bytes.toArray)`
### Result
More concise code, fewer allocations (one `String` vs N+1 `String`s),
standard JDK 17 API for hex encoding.
### Tests
- `sbt "cluster/compile" "remote/compile"` — passed
### References
Refs #3136
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