Apache Hadoop YARN: Moving beyond MapReduce and Batch by Arun C. Murthy, Vinod Kumar Vavilapalli, Doug Eadline,

By Arun C. Murthy, Vinod Kumar Vavilapalli, Doug Eadline, Joseph Niemiec, Jeff Markham

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Finally, we covered the ability to cloak files within HFS+ by partially deleting the files we want to hide. Assigning our targets an inode identifier of zero, but never scheduling them for deletion at the base level, we can hide the data from the system and the users, but still have it handy if we’ve been smart enough to note the actual allocation block addresses when we created the files. Hacking the file system within Mac OS X isn’t all that difficult. Hopefully this chapter has provided enough of a foundation that you’ll be able to expand your own knowledge through your own research.

The file size for the journal is never changed, nor is the file ever moved. The journal log functions similarly to some types of audit logs. Transactions are written to the log, starting at the beginning, and continuing until the log is filled up. When the log has been filled, new transactions are written to the beginning of the file, replacing the oldest transactions in the log. In this way, the journal log contents are volatile, and only the most recent transactions are stored. MetaData Mac OS X, just like many other popular operating systems, stores a lot of metadata on the files in the file system.

The easiest method for viewing the metadata associated with a particular file is to use the mdls command from the CLI. 7. 7 Using mdls to List the Metadata 37 38 CHAPTER 3: The Filesystem we’ve used the mdls command to list out the metadata associated with this chapter, as it’s being written. Understanding Forks Files contain data, and that data is typically stored in a fork. For most hackers with UNIX knowledge, the data fork is known as the primary fork containing the data we use in a file. But this isn’t always the case.

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