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From tao xiao <xiaotao...@gmail.com>
Subject Got IOException when writing metrics to csv file
Date Wed, 04 Feb 2015 11:15:12 GMT
Hi team,

I was running the mirror maker off the trunk code and got IOException when
configuring the mirror maker to use KafkaCSVMetricsReporter as the metric
reporter

Here is the exception I got

java.io.IOException: Unable to create /tmp/csv1/BytesPerSec.csv

at
com.yammer.metrics.reporting.CsvReporter.createStreamForMetric(CsvReporter.java:141)

at
com.yammer.metrics.reporting.CsvReporter.getPrintStream(CsvReporter.java:257)

at com.yammer.metrics.reporting.CsvReporter.access$000(CsvReporter.java:22)

at
com.yammer.metrics.reporting.CsvReporter$1.getStream(CsvReporter.java:156)

at
com.yammer.metrics.reporting.CsvReporter.processTimer(CsvReporter.java:212)

at
com.yammer.metrics.reporting.CsvReporter.processTimer(CsvReporter.java:22)

at com.yammer.metrics.core.Timer.processWith(Timer.java:214)

at com.yammer.metrics.reporting.CsvReporter.run(CsvReporter.java:163)

at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)

at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:304)

at
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:178)

at
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)

at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)

at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)

at java.lang.Thread.run(Thread.java:745)


Here is the configuration I put in the consumer.properties

zookeeper.connect=127.0.0.1:2181

# timeout in ms for connecting to zookeeper

zookeeper.connection.timeout.ms=1000000

#consumer group id

group.id=kafka-topic

auto.offset.reset=smallest

#consumer timeout

#consumer.timeout.ms=5000

# Metrics

kafka.metrics.polling.interval.secs=5

kafka.metrics.reporters=kafka.metrics.KafkaCSVMetricsReporter

kafka.csv.metrics.dir=/tmp/csv1

kafka.csv.metrics.reporter.enabled=true


I debug the code and discovered that the issue was caused different metrics
sharing the same metric name. I diff the trunk code with 0.8.1
on ConsumerTopicStats.scala

from 0.8.1

val byteRate = newMeter(metricId + "BytesPerSec",  "bytes",
TimeUnit.SECONDS)

from trunk

val byteRate = newMeter("BytesPerSec", "bytes", TimeUnit.SECONDS, tags)


trunk removes the metricId from the name which results in same metric name
BytesPerSec used by multiple metrics.


Is this a bug or by intention?
-- 
Regards,
Tao

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