JSONEventLayoutV1 should be thread-safe #81
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``` ERROR StatusConsoleListener An exception occurred processing Appender console java.util.ConcurrentModificationException at java.base/java.util.HashMap$HashIterator.nextNode(HashMap.java:1511) at java.base/java.util.HashMap$EntryIterator.next(HashMap.java:1544) at java.base/java.util.HashMap$EntryIterator.next(HashMap.java:1542) at net.minidev.json.JSONObject.writeJSON(JSONObject.java:162) at net.minidev.json.JSONObject.toJSONString(JSONObject.java:72) at net.minidev.json.JSONObject.toString(JSONObject.java:261) at net.logstash.log4j.JSONEventLayoutV1.format(JSONEventLayoutV1.java:137) at org.apache.log4j.bridge.LayoutAdapter.toByteArray(LayoutAdapter.java:71) at org.apache.log4j.bridge.LayoutAdapter.encode(LayoutAdapter.java:92) at org.apache.log4j.bridge.LayoutAdapter.encode(LayoutAdapter.java:29) at org.apache.logging.log4j.core.appender.AbstractOutputStreamAppender.directEncodeEvent(AbstractOutputStreamAppender.java:215) at org.apache.logging.log4j.core.appender.AbstractOutputStreamAppender.tryAppend(AbstractOutputStreamAppender.java:208) at org.apache.logging.log4j.core.appender.AbstractOutputStreamAppender.append(AbstractOutputStreamAppender.java:199) at org.apache.logging.log4j.core.config.AppenderControl.tryCallAppender(AppenderControl.java:161) at org.apache.logging.log4j.core.config.AppenderControl.callAppender0(AppenderControl.java:134) at org.apache.logging.log4j.core.config.AppenderControl.callAppenderPreventRecursion(AppenderControl.java:125) at org.apache.logging.log4j.core.config.AppenderControl.callAppender(AppenderControl.java:89) at org.apache.logging.log4j.core.config.LoggerConfig.callAppenders(LoggerConfig.java:683) at org.apache.logging.log4j.core.config.LoggerConfig.processLogEvent(LoggerConfig.java:641) at org.apache.logging.log4j.core.config.LoggerConfig.log(LoggerConfig.java:624) at org.apache.logging.log4j.core.config.LoggerConfig.log(LoggerConfig.java:560) at org.apache.logging.log4j.core.config.DefaultReliabilityStrategy.log(DefaultReliabilityStrategy.java:63) at org.apache.logging.log4j.core.Logger.log(Logger.java:163) at org.apache.logging.log4j.spi.AbstractLogger.tryLogMessage(AbstractLogger.java:2168) at org.apache.logging.log4j.spi.AbstractLogger.logMessageTrackRecursion(AbstractLogger.java:2122) at org.apache.logging.log4j.spi.AbstractLogger.logMessageSafely(AbstractLogger.java:2105) at org.apache.logging.log4j.spi.AbstractLogger.logMessage(AbstractLogger.java:1985) at org.apache.logging.log4j.spi.AbstractLogger.logIfEnabled(AbstractLogger.java:1838) at org.apache.logging.slf4j.Log4jLogger.info(Log4jLogger.java:175) at org.apache.spark.internal.Logging.logInfo(Logging.scala:60) at org.apache.spark.internal.Logging.logInfo$(Logging.scala:59) at org.apache.spark.scheduler.DAGScheduler.logInfo(DAGScheduler.scala:121) at org.apache.spark.scheduler.DAGScheduler.handleMapStageSubmitted(DAGScheduler.scala:1365) at org.apache.spark.scheduler.DAGSchedulerEventProcessLoop.doOnReceive(DAGScheduler.scala:3007) at org.apache.spark.scheduler.DAGSchedulerEventProcessLoop.onReceive(DAGScheduler.scala:2994) at org.apache.spark.scheduler.DAGSchedulerEventProcessLoop.onReceive(DAGScheduler.scala:2983) at org.apache.spark.util.EventLoop$$anon$1.run(EventLoop.scala:49) ```
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It looks like the
Layoutimplementations are supposed to be thread-safe, though I could not find any proof in log4j documentation.