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From "Aleksey Yeschenko (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CASSANDRA-9975) Flatten RowIterator call hierarchy with a shared RowTransformer
Date Thu, 03 Sep 2015 16:54:47 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-9975?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Aleksey Yeschenko updated CASSANDRA-9975:
-----------------------------------------
    Fix Version/s:     (was: 3.0 beta 2)
                   3.0.0 rc1

> Flatten RowIterator call hierarchy with a shared RowTransformer
> ---------------------------------------------------------------
>
>                 Key: CASSANDRA-9975
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-9975
>             Project: Cassandra
>          Issue Type: Sub-task
>          Components: Core
>            Reporter: Benedict
>            Assignee: Benedict
>             Fix For: 3.0.0 rc1
>
>
> Stepping through a read response is made exceedingly difficult by the sheer depth of
the call hierarchy, and how rapidly your context jumps around. This ticket intend to partially
address that, by flattening one of the main causes of this: iterator transformations.
> I have a patch that attempts to mitigate (but not entirely eliminate) this, through the
introduction of a {{RowTransformer}} class that all transformations are applied through. If
a transformation has already been applied, the {{RowTransformer}} class does not wrap a new
iterator, but instead returns a new {{RowTransformer}} that wraps the original underlying
(untransformed) iterator and both transformations. This can accumulate an arbitrary number
of transformations and, quite importantly, can apply the filtration step {{Unfiltered ->
Row}}  in the same instance as well. The intention being that a majority of control flow happens
inside this {{RowTransformer}}, so there is far less context jumping to cope with.



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