Errata
The errata list is a list of errors and their corrections that were found after the product was released. If the error was corrected in a later version or reprint the date of the correction will be displayed in the column titled "Date Corrected".
The following errata were submitted by our customers and approved as valid errors by the author or editor.
Color key: Serious technical mistake Minor technical mistake Language or formatting error Typo Question Note Update
| Version | Location | Description | Submitted By | Date submitted | Date corrected |
|---|---|---|---|---|---|
Page 24 1st paragraph |
"but if the count is output from the reducer with the count" should change the second count to average? Note from the Author or Editor: |
cxl | Jul 16, 2014 | Jul 22, 2015 | |
| Printed, PDF, ePub, Mobi, Safari Books Online, Other Digital Version | Page 28 First paragrpah, line 3 |
Typo 'aa' in place of the word 'a': "However the next example describes aa more complex" should be: "However the next example describes a more complex" |
Elliot West | Feb 07, 2013 | Jul 22, 2015 |
| Printed | Page 31 source code paragraph, i.e., MedianStdDevCombiner#reduce(...) |
In source code (MedianStdDevCombiner#reduce) at 15th line: count.set(count.get() ...); To get correct 'outValue', that code will change like this: outValue.put(entry.getKey(), count.set(count.get() ...); Thanks. :) Note from the Author or Editor: |
Justin Lee | May 23, 2013 | Jul 22, 2015 |
| ePub | Page 43 Figure 2-1 |
I think the reducer output for one of the reducers should read "(group A, summary) (group C, summary)", since the partitioner should make sure that identical keys would all go to the same reducer, hence partition the key identifying group A to reducer 1, the key for group B to reducer 2, and so on (see also Page 27 (Chapter 1 > Map Reduce and Hadoop Refresher > partitioner) ). Note from the Author or Editor: |
Rupert Huelsey | Nov 29, 2012 | Jul 22, 2015 |
| Printed, PDF | Page 59 pseudocode, cleanup() |
In the cleanup() method, it states "for record in top sorted ten list" - the word 'ten' is in the wrong position. This text should read instead "for record in top ten sorted list" Note from the Author or Editor: |
Robert Dyer | Feb 22, 2015 | Jul 22, 2015 |
| Printed | Page 60 1st paragraph, 3rd line |
The original sentence : "These are the lowest K for this particular map task" But in the context (i.e. top ten pattern), 'lowest ' is errata. so, 'highest' is correct. I think :) Note from the Author or Editor: |
Justin Lee | May 23, 2013 | Jul 22, 2015 |
| Printed | Page 71 Fourth bullet |
The fourth bullet states "The generating data pattern" is part of this chapter -- which was true once upon a time. It was moved to the Input/Output chapter when this chapter was created. This bullet should be removed. |
Adam Shook |
Jan 09, 2013 | Jul 22, 2015 |
| Printed | Page 164, 165 164p: last paragraph, 165p: source code 36 line |
At the paragraph that describe the 'Replicated join mapper code' "The map is used in the calls to map to enrich the output value with the user's reputation." should be "The map is used in the calls to map to enrich the output key with the user's reputation." i.e., change 'output value' to 'output key' also in 165 page's source code "outkey.set(value.get() + ... );" should be "outkey.set(key.toString() + ...);" Is it right? thanks. Note from the Author or Editor: |
Justin Lee | May 23, 2013 | Jul 22, 2015 |
| Printed | Page 193 2nd paragraph (after the code sample) |
"RecordReader code" should actually be "RecordWriter code" Note from the Author or Editor: |
Yury | Dec 24, 2013 | Jul 22, 2015 |
| Printed | Page 207 1st paragraph |
"The main thing to focus on is the templated arguments when extending the InputFormat class" - class name here should be OutputFormat, not InputFormat. Note from the Author or Editor: |
Yury | Jan 04, 2014 | Jul 22, 2015 |