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Large Scale and Big Data
book

Large Scale and Big Data

by Sherif Sakr, Mohamed Gaber
June 2014
Intermediate to advanced content levelIntermediate to advanced
636 pages
23h 13m
English
Auerbach Publications
Content preview from Large Scale and Big Data
265PEGASUS
is
rowcol rowcol mval
blockblock elem elem elem
,, ,, ,
11 1
,, ,,rowcol mval
elem elem elem
kk k
()
. Similarly,
the format of a vector block with k nonzero elements is
id id vval
blockelemelem
,, ,,
11
(
id vval
elem elem
kk
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)
. Only blocks with at least one nonzero elements are saved to disk.
This block encoding forces nearby edges in the adjacency matrix to be closely located;
it is different from Hadoop’ default behavior, which does not guarantee co-locating
them. After grouping, GIM-V is performed on blocks, not on individual elements.
GIM-V BL is illustrated in Figure 8.2.
In Section 8.5, we observe that GIM-V BL is at least 5 times faster ...
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Publisher Resources

ISBN: 9781466581500