Hadoop mapreduce task metrics, unable to send metrics data.
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Key: HADOOP-3521
URL: https://issues.apache.org/jira/browse/HADOOP-3521
Project: Hadoop Core
Issue Type: Bug
Components: mapred
Affects Versions: 0.18.0
Reporter: Eric Yang
Found the following new metrics in tasktracker:
mapTaskSlots (short)
reduceTaskSlots (short)
tasks_failed_timeout (int)
tasks_failed_ping (int)
After configuring Simon to match the new metrics, this error was thrown in the
task tracker log:
Exception in thread "Timer thread for monitoring mapred"
java.lang.ClassCastException: java.lang.Long
at com.yahoo.simon.hadoop.metrics.Client.sendBlurb(Client.java:266)
at
com.yahoo.simon.hadoop.metrics.SimonContext.emitRecord(SimonContext.java:160)
at
org.apache.hadoop.metrics.spi.AbstractMetricsContext.emitRecords(AbstractMetricsContext.java:304)
at
org.apache.hadoop.metrics.spi.AbstractMetricsContext.timerEvent(AbstractMetricsContext.java:290)
at
org.apache.hadoop.metrics.spi.AbstractMetricsContext.access$000(AbstractMetricsContext.java:50)
at
org.apache.hadoop.metrics.spi.AbstractMetricsContext$1.run(AbstractMetricsContext.java:249)
at java.util.TimerThread.mainLoop(Timer.java:512)
at java.util.TimerThread.run(Timer.java:462)
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