Periodically, I get the following exception when trying to process simulation logs from my tests:
gatling-charts-highcharts-bundle-2.3.1/bin/gatling.sh -ro $(pwd)/build/sims
GATLING_HOME is set to /Public/gatling-charts-highcharts-bundle-2.3.1
Parsing log file(s)…
Exception in thread “main” java.lang.NumberFormatException: For input string: “START”
at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
at java.lang.Long.parseLong(Long.java:589)
at java.lang.Long.parseLong(Long.java:631)
at scala.collection.immutable.StringLike.toLong(StringLike.scala:306)
at scala.collection.immutable.StringLike.toLong$(StringLike.scala:306)
at scala.collection.immutable.StringOps.toLong(StringOps.scala:29)
at io.gatling.charts.stats.LogFileReader.$anonfun$firstPass$1(LogFileReader.scala:96)
at scala.collection.Iterator.foreach(Iterator.scala:929)
at scala.collection.Iterator.foreach$(Iterator.scala:929)
at scala.collection.Iterator$ConcatIterator.foreach(Iterator.scala:167)
at io.gatling.charts.stats.LogFileReader.firstPass(LogFileReader.scala:86)
at io.gatling.charts.stats.LogFileReader.$anonfun$x$4$1(LogFileReader.scala:125)
at io.gatling.charts.stats.LogFileReader.parseInputFiles(LogFileReader.scala:63)
at io.gatling.charts.stats.LogFileReader.(LogFileReader.scala:125)
at io.gatling.app.RunResultProcessor.initLogFileReader(RunResultProcessor.scala:67)
at io.gatling.app.RunResultProcessor.processRunResult(RunResultProcessor.scala:49)
at io.gatling.app.Gatling$.start(Gatling.scala:68)
at io.gatling.app.Gatling$.fromArgs(Gatling.scala:45)
at io.gatling.app.Gatling$.main(Gatling.scala:37)
at io.gatling.app.Gatling.main(Gatling.scala)
I tracked down the offending line in the log:
$ grep -B1 -A1 -nP '^USER\t.\t.\t.*\t.START’ build/sims/.log
build/sims/simulation-34.207.209.78.log-5897963-USER Post Protobuf Device Event 2690914 START 1531337362429 1531337362429
build/sims/simulation-34.207.209.78.log:5897964:USER Post Protobuf Device Event USER Post Protobuf Device Event 2690916 START 1531337362429 1531337362429
build/sims/simulation-34.207.209.78.log-5897965-USER Post Protobuf Device Event 2690917 START 1531337362429 1531337362429
Looks like there is some file I/O / threading issue writing the user entry 2690915 (for this specific example).
Running with gatlingVersion=2.3.1 and scalaVersion=2.12.3.
Has anyone else run into a similar this issue? Any known fixes?