By Aaron Cordova, Billie Rinaldi, Michael Wall
Wake up to hurry on Apache Accumulo, the versatile, high-performance key/value shop created via the nationwide safeguard enterprise (NSA) and according to Google’s BigTable facts garage method. Written by means of former NSA group individuals, this entire instructional and reference covers Accumulo structure, software improvement, desk layout, and cell-level security.
With transparent details on method management, functionality tuning, and most sensible practices, this ebook is perfect for builders looking to write Accumulo functions, directors charged with fitting and conserving Accumulo, and different execs attracted to what Accumulo has to provide. you can find every little thing you can use the program fully.
Get a high-level advent to Accumulo’s structure and knowledge model
Take a fast journey via unmarried- and multiple-node installations, info ingest, and query
write Accumulo purposes for a number of use situations, in line with examples
Dive into Accumulo internals, together with info now not to be had within the documentation
Get distinct info for fitting, administering, tuning, and measuring performance
research top practices in keeping with winning implementations within the field
locate solutions to universal questions that each new Accumulo person asks
Read or Download Accumulo: Application Development, Table Design, and Best Practices PDF
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Extra info for Accumulo: Application Development, Table Design, and Best Practices
This gives Accumulo more of a columnar-style storage that is amenable to many analytical access patterns. Applying locality groups to our earlier example, we can choose to put the content col‐ umn family in one locality group and the metadata column family in another locality group. Before we assigned column families to locality groups, a scan configured to read only the metadata columns would still end up reading the content columns off of disk (Figure 1-12), and tablet servers would filter them out, returning only the data requested.
These types of custom compression are not implemented in Accumulo. Robust Timestamps When Accumulo tablet servers are assigning timestamps to key-value pairs, Accu‐ mulo ensures that the timestamps are internally consistent. Accumulo only assigns new timestamps that are later than the most recent timestamp for a given tablet. In other words, timestamps assigned by a tablet server are guaranteed to increase.
Once data is writ‐ ten to a table and it reaches a certain size threshold, the tablet server hosting it finds a good point in the middle of the tablet and splits it into two tablets. When a tablet server does this it always splits a tablet on a row boundary, guarantee‐ ing that the data for each row is fully contained within one tablet and therefore resides on exactly one server. This is important to allowing consistent updates to be applied atomically to the data in an individual row. For example, as our Wikipedia table grows, it will eventually be split along a row boundary into two tablets (Figure 1-20).