LuciferYang commented on PR #37480:
URL: https://github.com/apache/spark/pull/37480#issuecomment-1211638145
Although this is a minor change, in order not to have a negative impact, I
simply compared the performance as follows:
**Bench Code**
```
val valuesPerIteration = 100000
val jsonString =
"""{"numCommittedKeys":1,"numUncommittedKeys":1,"totalMemUsageBytes":3976,
|"writeBatchMemUsageBytes":17,"totalSSTFilesBytes":1146,
|"nativeOpsHistograms":{"get":{"sum":7,"avg":3.5,"stddev":0.5,
|"median":3.0,"p95":3.9,"p99":3.98,"count":2},"put":{"sum":17927,
|"avg":17927.0,"stddev":0.0,"median":17927.0,"p95":17927.0,
|"p99":17927.0,"count":1},"compaction":{"sum":0,"avg":0.0,
|"stddev":0.0,"median":0.0,"p95":0.0,"p99":0.0,"count":0}},
|"lastCommitLatencyMs":{"fileSync":595,"writeBatch":17,
|"flush":60,"pause":0,"checkpoint":64,"compact":0},"filesCopied":1,
|"bytesCopied":1146,"filesReused":0,"zipFileBytesUncompressed":6973,
|"nativeOpsMetrics":{"writerStallDuration":0,"totalBytesReadThroughIterator":0,
|"readBlockCacheHitCount":0,"totalBytesWrittenByCompaction":0,
|"readBlockCacheMissCount":0,"totalBytesReadByCompaction":0,
|"totalBytesWritten":17,"totalBytesRead":0}}""".stripMargin
val metrics: RocksDBMetrics = new
ObjectMapper().registerModule(DefaultScalaModule)
.readValue(jsonString, classOf[RocksDBMetrics])
val benchmark = new Benchmark("Test RocksDBMetrics to Json",
valuesPerIteration, output = output)
benchmark.addCase("Use Json4s") { _: Int =>
for (_ <- 0L until valuesPerIteration) {
metrics.json
}
}
val mapper = new ObjectMapper().registerModule(DefaultScalaModule)
benchmark.addCase("Use Jackson") { _: Int =>
for (_ <- 0L until valuesPerIteration) {
mapper.writeValueAsString(metrics)
}
}
benchmark.run()
```
**Java8**
```
OpenJDK 64-Bit Server VM 1.8.0_345-b01 on Linux 5.15.0-1014-azure
Intel(R) Xeon(R) Platinum 8272CL CPU @ 2.60GHz
Test RocksDBMetrics to Json: Best Time(ms) Avg Time(ms)
Stdev(ms) Rate(M/s) Per Row(ns) Relative
------------------------------------------------------------------------------------------------------------------------
Use Json4s 4078 4091
17 0.0 40785.0 1.0X
Use Jackson 384 386
1 0.3 3837.3 10.6X
```
**Java11**
```
OpenJDK 64-Bit Server VM 11.0.16+8-LTS on Linux 5.15.0-1014-azure
Intel(R) Xeon(R) Platinum 8370C CPU @ 2.80GHz
Test RocksDBMetrics to Json: Best Time(ms) Avg Time(ms)
Stdev(ms) Rate(M/s) Per Row(ns) Relative
------------------------------------------------------------------------------------------------------------------------
Use Json4s 3361 3362
2 0.0 33606.9 1.0X
Use Jackson 361 362
1 0.3 3610.3 9.3X
```
**Java17**
```
OpenJDK 64-Bit Server VM 17.0.4+8-LTS on Linux 5.15.0-1014-azure
Intel(R) Xeon(R) Platinum 8272CL CPU @ 2.60GHz
Test RocksDBMetrics to Json: Best Time(ms) Avg Time(ms)
Stdev(ms) Rate(M/s) Per Row(ns) Relative
------------------------------------------------------------------------------------------------------------------------
Use Json4s 3787 3792
7 0.0 37870.2 1.0X
Use Jackson 362 367
5 0.3 3618.8 10.5X
```
Jackson looks better, though that's not the key point
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