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DistCp</title>
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<div class="section">
<h2>Overview<a name="Overview"></a></h2>
<p>
DistCp (distributed copy) is a tool used for large inter/intra-cluster
copying. It uses Map/Reduce to effect its distribution, error
handling and recovery, and reporting. It expands a list of files and
directories into input to map tasks, each of which will copy a partition
of the files specified in the source list.
</p>
<p>
The erstwhile implementation of DistCp has its share of quirks and
drawbacks, both in its usage, as well as its extensibility and
performance. The purpose of the DistCp refactor was to fix these shortcomings,
enabling it to be used and extended programmatically. New paradigms have
been introduced to improve runtime and setup performance, while simultaneously
retaining the legacy behaviour as default.
</p>
<p>
This document aims to describe the design of the new DistCp, its spanking
new features, their optimal use, and any deviance from the legacy
implementation.
</p>
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