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From olegz <...@git.apache.org>
Subject [GitHub] nifi pull request: NIFI-1028 initial commit of NiFi In Depth docum...
Date Mon, 18 Apr 2016 17:53:45 GMT
Github user olegz commented on a diff in the pull request:

    https://github.com/apache/nifi/pull/339#discussion_r60103526
  
    --- Diff: nifi-docs/src/main/asciidoc/nifi-in-depth.adoc ---
    @@ -0,0 +1,209 @@
    +//
    +// Licensed to the Apache Software Foundation (ASF) under one or more
    +// contributor license agreements.  See the NOTICE file distributed with
    +// this work for additional information regarding copyright ownership.
    +// The ASF licenses this file to You under the Apache License, Version 2.0
    +// (the "License"); you may not use this file except in compliance with
    +// the License.  You may obtain a copy of the License at
    +//
    +//     http://www.apache.org/licenses/LICENSE-2.0
    +//
    +// Unless required by applicable law or agreed to in writing, software
    +// distributed under the License is distributed on an "AS IS" BASIS,
    +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    +// See the License for the specific language governing permissions and
    +// limitations under the License.
    +//
    +Apache NiFi In Depth
    +====================
    +Apache NiFi Team <dev@nifi.apache.org>
    +:homepage: http://nifi.apache.org
    +
    +Intro
    +-----
    +This advanced level document is aimed at providing an in-depth look at the implementation
and design decisions of NiFi. It assumes the reader has read enough of the other documentation
to know the basics of NiFi.
    +
    +FlowFiles are at the heart of NiFi and its flow-based design. A FlowFile is just a collection
of attributes and a pointer to content, which is associated with one or more provenance events.
The attributes are key/value pairs that act as the metadata for the FlowFile, such as the
FlowFile filename. The content is the actual data or the payload of the file. Provenance is
a record of what’s happened to the FlowFile. Each one of these parts has its own repository
(repo) for storage.
    --- End diff --
    
    May be instead of "FlowFile is just a collection of attributes and a pointer to content"
use "FlowFile is a data record which consists of pointer to the content (payload) and attributes
to support such content". The ordering of _content_ then _attributes_ is also important, otherwise
what I am reading is that "FlowFile is just attributes. . ."


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