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Performance improvement using Jackson ObjectWriter? #28

Description

@cchacin

From Jackson's best practices:

7. Prefer ObjectReader/ObjectWriter over ObjectMapper
Although the main reason to prefer these objects is thread-safety (and thus correctness), there may be performance benefits as well. Latest Jackson versions (2.1 and above) will be able to reuse root-level (de)serializers, making reuse of ObjectReaders and ObjectWriters bit more efficient than using ObjectMapper.

I notice in that the TsdLogSink.record method is using objectMapper.writeValueAsString, even when we use a serializer with the Streaming API we should take a look to the possible performance improvements with the writers/readers instead.

I write this simple benchmark using JMH to verify this, but would be great to have the same for the TsdLogSink methods:

@BenchmarkMode(Mode.Throughput)
@OutputTimeUnit(TimeUnit.SECONDS)
@Warmup(iterations = 16,
        time = 2500,
        timeUnit = TimeUnit.MILLISECONDS)
@Measurement(iterations = 16,
             time = 2500,
             timeUnit = TimeUnit.MILLISECONDS)
@Fork(1)
@State(Scope.Benchmark)
public class JacksonBenchmark {
    private ObjectMapper objectMapper;
    private ObjectWriter objectWriter;
    private Pojo         pojo;

    @Setup
    public void start() throws Exception {
        this.objectMapper = new ObjectMapper();
        this.objectWriter = this.objectMapper.writerFor(Pojo.class);
        this.pojo = new Pojo();
        this.pojo.a = 1;
        this.pojo.b = 1;
        this.pojo.c = "1";
        this.pojo.d = true;
        this.pojo.e = false;
        this.pojo.f = 1L;
        this.pojo.g = 1L;
    }

    @Benchmark
    public String serializeWithObjectMapper() throws Exception {
        return this.objectMapper.writeValueAsString(this.pojo);
    }

    @Benchmark
    public String serializeWithObjectWriter() throws Exception {
        return this.objectWriter.writeValueAsString(this.pojo);
    }

    public static final class Pojo {
        public int     a;
        public Integer b;
        public String  c;
        public boolean d;
        public Boolean e;
        public long    f;
        public Long    g;
    }
}

RESULTS

Result "serializeWithObjectMapper":
  2101050.903 ±(99.9%) 13548.612 ops/s [Average]
  (min, avg, max) = (2085229.061, 2101050.903, 2127269.712), stdev = 13306.549
  CI (99.9%): [2087502.290, 2114599.515] (assumes normal distribution)
Result "serializeWithObjectWriter":
  2137441.318 ±(99.9%) 19695.087 ops/s [Average]
  (min, avg, max) = (2104353.144, 2137441.318, 2173609.575), stdev = 19343.209
  CI (99.9%): [2117746.231, 2157136.406] (assumes normal distribution)

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