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From "Josh Elser (JIRA)" <>
Subject [jira] [Commented] (ACCUMULO-3633) Please provide information on implementing custom iterators in the documentation
Date Wed, 18 Mar 2015 14:36:39 GMT


Josh Elser commented on ACCUMULO-3633:

bq. in addition to combiner and filter, could mention transforming iterator

As a note, I looked at TransformingIterator to potentially include as a base-class for users
to build on, but I ultimately didn't feel like it was general/simple/easy enough to be worth
mentioning to a user who was writing their first (few) iterator(s). I know the class is well
written/tested, but I just couldn't find justification to recommend that a developer try to
use it themselves. If there's a simple case that I overlooked that isn't about rewriting large
amounts of data in a very tricky manner, it should definitely be added.

> Please provide information on implementing custom iterators in the documentation
> --------------------------------------------------------------------------------
>                 Key: ACCUMULO-3633
>                 URL:
>             Project: Accumulo
>          Issue Type: Wish
>          Components: docs
>    Affects Versions: 1.6.0
>         Environment: Centos 6.5, Accumulo 1.6.0, CDH 5. 
>            Reporter: Vaibhav Thapliyal
>            Assignee: Josh Elser
>              Labels: documentation
>             Fix For: 1.7.0
>         Attachments: 0001-ACCUMULO-3633-User-manual-chapter-on-custom-iterator.patch,
Apache Accumulo User Manual Version 1.7.pdf
>          Time Spent: 0.5h
>  Remaining Estimate: 0h
> Dear all,
> Can you please provide a documentation regarding creating custom Iterators. For example,
explain the functionality  of the functions inside SortedKeyValueIterator and how to override
those functions.
> Please explain how these functions are executed (which class calls these functions when
the iterator executes).
> I would appreciate if these changes are made in your future documentations as this would
help developers who are new to accumulo to quickly get started on writing their own custom
iterators which is an essential part of accumulo. 

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