sam liu created HDFS-4527:
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Summary: For shortening the time of TaskTracker heartbeat,
decouple the statics collection operations
Key: HDFS-4527
URL: https://issues.apache.org/jira/browse/HDFS-4527
Project: Hadoop HDFS
Issue Type: Improvement
Components: performance
Affects Versions: 1.1.1
Reporter: sam liu
In each heartbeat of TaskTracker, it will calculate some system statics, like
the free disk space, available virtual/physical memory, cpu usage, etc.
However, it's not necessary to calculate all the statics in every heartbeat,
and this will consume many system resource and impace the performance of
TaskTracker heartbeat. Furthermore, the characteristics of system
properties(disk, memory, cpu) are different and it's better to collect their
statics in different intervals.
To reduce the latency of TaskTracker heartbeat, one solution is to decouple all
the system statics collection operations from it, and issue separate threads to
do the statics collection works when the TaskTracker starts. The threads could
be three: the first one is to collect cpu related statics in a short interval;
the second one is to collect memory related statics in a normal interval; the
third one is to collect disk related statics in a long interval. And all the
interval could be customized by the parameter
"mapred.stats.collection.interval" in the mapred-site.xml. At last, the
heartbeat could get values of system statics from the memory directly.
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