Errata

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The errata list is a list of errors and their corrections that were found after the product was released.

The following errata were submitted by our customers and have not yet been approved or disproved by the author or editor. They solely represent the opinion of the customer.

Color Key: Serious Technical Mistake Minor Technical Mistake Language or formatting error Typo Question



Version Location Description Submitted By
Printed Page 146
Table 5-3, row 1, col 2, 1st sentence

"How long are you mappers running for?"
Should be:
"How long are your mappers running for?"

 KS Chow 
Printed Page 202
1st paragraph under heading "Text Output"

Heading "Text Output", paragraph 1, line 5, word 3 -> TextOuputFormat

 kchow8 
Printed Page 239
Warning paragraph about Streaming

The warning about streaming says, in its second paragraph:

"Streaming also accepts the -files and -archives options for copying files into the distributed cache for use by your Streaming scripts.

Consulting the built-in help for streaming, I note that there are neither "-files" nor "-archives" options. There are however:

-cacheFile fileNameURI
-cacheArchive fileNameURI

 Erik Forsberg 
Printed Page 255
2nd paragraph after Table 9-2

Excerpt: "...wanted to run 2 processes on each processor, then you should set mapred.tasktracker.map.tasks.maximum and mapred.tasktracker.map.tasks.maximum to both be 7..."

The second reference to mapred.tasktracker.map.tasks.maximum is incorrect, it should be mapred.tasktracker.reduce.tasks.maximum.

 kchow8 
Printed Page 355
Loading Data - Example

I'm not entirely sure whether this is a serious technical mistake, but it may be an API issue.

The example for Loading Data into HBase example uses the old API for importing data I believe. Shouldn't it extend Mapper<Text, Text, Text, IntWritable> and use the method:

public void map(LongWritable key, Text value, Context context) throws IOException, InterruptedException {
}

Many thanks,
Jon.

 Jonathan Holloway