Pal Konyves created FLUME-2517:
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Summary: Performance issue: SimpleDateFormat constructor takes 30%
of HDFSEventSink.process()
Key: FLUME-2517
URL: https://issues.apache.org/jira/browse/FLUME-2517
Project: Flume
Issue Type: Bug
Components: Sinks+Sources
Affects Versions: v1.5.0.1
Environment: linux i686
java version "1.7.0_45"
Reporter: Pal Konyves
I started investigating why HDFS sink has so bad throughput in v 1.5.0.0. It
seems to be better in 1.6.0.0 (current trunk).
PseudoTx channel was filling up, because HDFS Sink could not write as fast as
data coming from sink.
Profiling from jconsole revealed that 30% of the time spent in
HDFSEventSink.process() method is taken by constructing SimpleDateFormat
objects. SimpleDateFormat object is notoriously a heavy and time consuming
object to create. It is also not thread-safe.
It is used in HDFS Sink to calculate the path that contains date-time
wildcards. I will provide a patch to cache SimpleDateFormat objects for thread.
With this patch, the PseudoTx channel I used for testing was not constantly
filling up, and throughput was much better.
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