MapOutputBuffer allocates 4x as much space to record capacity as intended
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Key: HADOOP-3475
URL: https://issues.apache.org/jira/browse/HADOOP-3475
Project: Hadoop Core
Issue Type: Bug
Affects Versions: 0.17.0
Reporter: Chris Douglas
Assignee: Chris Douglas
Fix For: 0.18.0
When setting up its accounting tables, MapTask.MapOutputBuffer calculates the
size of each of its buffers as:
{noformat}
Where #total_bytes is $io.sort.mb * 2^20 and #accounting_bytes is
$io.sort.record.percent * #total_bytes
kvbuffer: #total_bytes - #accounting_bytes
kvoffsets: 1/4 of #accounting_bytes
kvindices: 3/4 of #accounting_bytes
{noformat}
kvoffsets and kvindices are ints, not bytes; the size of both arrays is
incorrectly calculated.
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