Suggestion to note close connection explicitly at exit in HBase book, and
improve MapReduce interface by adding explicit closes
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Key: HBASE-3700
URL: https://issues.apache.org/jira/browse/HBASE-3700
Project: HBase
Issue Type: Improvement
Reporter: Guanpeng Xu
Priority: Minor
I once had an issue of "Too many connections" in ZooKeeper while running a
MapReduce job where tables are used in my own classes instead of the interface
provided by HBase (e.g. TableInputFormat and TableOutputFormat etc).
Investigation suggests this is due to many ZooKeeper's connection slots are
occupied by remaining connections after clients exit, so that the free slots
are not enough.
Discussed with Lars George, I suggest we note the need of explicit close of
connections (to ZooKeepers) in HBase book. Lars also suggests we improve
TableOutputFormat by adding explicit calls to close methods.
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