Reuse 'subcountersArray' in Counters#Group.makeEscapedCompactString()
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Key: MAPREDUCE-2087
URL: https://issues.apache.org/jira/browse/MAPREDUCE-2087
Project: Hadoop Map/Reduce
Issue Type: Improvement
Reporter: Amar Kamat
While optimizing {{Counters#Group.makeEscapedCompactString()}}, MAPREDUCE-1533
pre-converted the sub-counters into their escaped form for computing the
overall size required for holding the escaped sub-counters in a
{{StringBuffer}}. As a result of this pre-conversion, escaped sub-counters are
stored/cached in an array called _subcountersArray_. Later, while the final
escaped string is constructed, all the sub-counters are again converted into
their escaped form. Here the _subcountersArray_, which is created during the
pre-conversion stage, can be reused.
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