diff --git a/docs/_graphics/druid-dataflow.svg b/docs/_graphics/druid-dataflow.svg
new file mode 100644
index 00000000000..7e70ac70265
--- /dev/null
+++ b/docs/_graphics/druid-dataflow.svg
@@ -0,0 +1,620 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg
+   xmlns:dc="http://purl.org/dc/elements/1.1/"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   version="1.1"
+   viewBox="40 36 470.92646 255.28501"
+   width="588.65808"
+   height="319.10626"
+   id="svg2"
+   inkscape:version="0.48.2 r9819"
+   sodipodi:docname="druid-dataflow.svg"
+   inkscape:export-filename="/Users/xavier/mmx/druid/docs/_graphics/druid-dataflow@2x.png"
+   inkscape:export-xdpi="244.5267"
+   inkscape:export-ydpi="244.5267">
+  <sodipodi:namedview
+     pagecolor="#ffffff"
+     bordercolor="#666666"
+     borderopacity="1"
+     objecttolerance="10"
+     gridtolerance="10"
+     guidetolerance="10"
+     inkscape:pageopacity="0"
+     inkscape:pageshadow="2"
+     inkscape:window-width="1616"
+     inkscape:window-height="949"
+     id="namedview318"
+     showgrid="false"
+     fit-margin-top="0"
+     fit-margin-left="0"
+     fit-margin-right="0"
+     fit-margin-bottom="0"
+     inkscape:zoom="0.9451452"
+     inkscape:cx="251.09952"
+     inkscape:cy="43.169182"
+     inkscape:window-x="0"
+     inkscape:window-y="0"
+     inkscape:window-maximized="0"
+     inkscape:current-layer="layer1" />
+  <metadata
+     id="metadata4">
+    <dc:date>2013-07-10 16:52Z</dc:date>
+    <!-- Produced by OmniGraffle Professional 5.4.4 -->
+    <rdf:RDF>
+      <cc:Work
+         rdf:about="">
+        <dc:format>image/svg+xml</dc:format>
+        <dc:type
+           rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
+        <dc:title></dc:title>
+      </cc:Work>
+    </rdf:RDF>
+  </metadata>
+  <defs
+     id="defs6">
+    <filter
+       id="Shadow"
+       filterUnits="userSpaceOnUse"
+       color-interpolation-filters="sRGB">
+      <feOffset
+         in="SourceAlpha"
+         result="offset"
+         dx="0"
+         dy="2"
+         id="feOffset9" />
+      <feFlood
+         flood-color="black"
+         flood-opacity=".12"
+         result="flood"
+         id="feFlood11" />
+      <feComposite
+         in="flood"
+         in2="offset"
+         operator="in"
+         id="feComposite13" />
+    </filter>
+    <font-face
+       font-family="Open Sans"
+       font-size="12"
+       panose-1="2 11 7 6 3 8 4 2 2 4"
+       units-per-em="1000"
+       underline-position="-75.195312"
+       underline-thickness="49.804688"
+       slope="0"
+       x-height="549.8047"
+       cap-height="724.1211"
+       ascent="1068.8477"
+       descent="-292.96875"
+       font-weight="bold"
+       id="font-face15"
+       stemv="0"
+       stemh="0"
+       accent-height="0"
+       ideographic="0"
+       alphabetic="0"
+       mathematical="0"
+       hanging="0"
+       v-ideographic="0"
+       v-alphabetic="0"
+       v-mathematical="0"
+       v-hanging="0"
+       strikethrough-position="0"
+       strikethrough-thickness="0"
+       overline-position="0"
+       overline-thickness="0">
+      <font-face-src
+         id="font-face-src17">
+        <font-face-name
+           name="OpenSans-Semibold"
+           id="font-face-name19" />
+      </font-face-src>
+    </font-face>
+    <marker
+       orient="auto"
+       overflow="visible"
+       markerUnits="strokeWidth"
+       id="FilledArrow_Marker"
+       viewBox="-1 -3 5 6"
+       markerWidth="5"
+       markerHeight="6"
+       style="color:#7f95a7;overflow:visible">
+      <g
+         id="g22">
+        <path
+           d="M 2.8800001,0 0,-1.08 0,1.08 z"
+           id="path24"
+           inkscape:connector-curvature="0"
+           style="fill:currentColor;stroke:currentColor;stroke-width:1" />
+      </g>
+    </marker>
+    <marker
+       orient="auto"
+       overflow="visible"
+       markerUnits="strokeWidth"
+       id="FilledArrow_Marker_2"
+       viewBox="-4 -3 5 6"
+       markerWidth="5"
+       markerHeight="6"
+       style="color:#7f95a7;overflow:visible">
+      <g
+         id="g27">
+        <path
+           d="M -2.8800001,0 0,1.08 0,-1.08 z"
+           id="path29"
+           inkscape:connector-curvature="0"
+           style="fill:currentColor;stroke:currentColor;stroke-width:1" />
+      </g>
+    </marker>
+    <font-face
+       font-family="Open Sans"
+       font-size="18"
+       panose-1="2 11 6 6 3 5 4 2 2 4"
+       units-per-em="1000"
+       underline-position="-75.195312"
+       underline-thickness="49.804688"
+       slope="0"
+       x-height="544.92188"
+       cap-height="724.1211"
+       ascent="1068.8477"
+       descent="-292.96875"
+       font-weight="500"
+       id="font-face31"
+       stemv="0"
+       stemh="0"
+       accent-height="0"
+       ideographic="0"
+       alphabetic="0"
+       mathematical="0"
+       hanging="0"
+       v-ideographic="0"
+       v-alphabetic="0"
+       v-mathematical="0"
+       v-hanging="0"
+       strikethrough-position="0"
+       strikethrough-thickness="0"
+       overline-position="0"
+       overline-thickness="0">
+      <font-face-src
+         id="font-face-src33">
+        <font-face-name
+           name="OpenSans"
+           id="font-face-name35" />
+      </font-face-src>
+    </font-face>
+    <font-face
+       font-family="Open Sans"
+       font-size="10"
+       panose-1="2 11 6 6 3 5 4 2 2 4"
+       units-per-em="1000"
+       underline-position="-75.195312"
+       underline-thickness="49.804688"
+       slope="0"
+       x-height="544.92188"
+       cap-height="724.1211"
+       ascent="1068.8477"
+       descent="-292.96875"
+       font-weight="500"
+       id="font-face37"
+       stemv="0"
+       stemh="0"
+       accent-height="0"
+       ideographic="0"
+       alphabetic="0"
+       mathematical="0"
+       hanging="0"
+       v-ideographic="0"
+       v-alphabetic="0"
+       v-mathematical="0"
+       v-hanging="0"
+       strikethrough-position="0"
+       strikethrough-thickness="0"
+       overline-position="0"
+       overline-thickness="0">
+      <font-face-src
+         id="font-face-src39">
+        <font-face-name
+           name="OpenSans"
+           id="font-face-name41" />
+      </font-face-src>
+    </font-face>
+    <filter
+       inkscape:collect="always"
+       id="filter4651"
+       color-interpolation-filters="sRGB">
+      <feGaussianBlur
+         inkscape:collect="always"
+         stdDeviation="0.9"
+         id="feGaussianBlur4653" />
+    </filter>
+    <filter
+       inkscape:collect="always"
+       id="filter4655"
+       color-interpolation-filters="sRGB">
+      <feGaussianBlur
+         inkscape:collect="always"
+         stdDeviation="0.9"
+         id="feGaussianBlur4657" />
+    </filter>
+    <filter
+       inkscape:collect="always"
+       id="filter4675"
+       color-interpolation-filters="sRGB">
+      <feGaussianBlur
+         inkscape:collect="always"
+         stdDeviation="0.90799225"
+         id="feGaussianBlur4677" />
+    </filter>
+    <filter
+       inkscape:collect="always"
+       id="filter4679"
+       color-interpolation-filters="sRGB">
+      <feGaussianBlur
+         inkscape:collect="always"
+         stdDeviation="0.90799225"
+         id="feGaussianBlur4681" />
+    </filter>
+    <filter
+       inkscape:collect="always"
+       id="filter4683"
+       color-interpolation-filters="sRGB">
+      <feGaussianBlur
+         inkscape:collect="always"
+         stdDeviation="0.90799225"
+         id="feGaussianBlur4685" />
+    </filter>
+    <filter
+       inkscape:collect="always"
+       id="filter4687"
+       color-interpolation-filters="sRGB">
+      <feGaussianBlur
+         inkscape:collect="always"
+         stdDeviation="0.90799225"
+         id="feGaussianBlur4689" />
+    </filter>
+  </defs>
+  <g
+     inkscape:groupmode="layer"
+     id="layer1"
+     inkscape:label="Layer2"
+     style="display:inline">
+    <g
+       id="g4821"
+       transform="translate(-2.6747754e-6,-3.30513e-8)">
+      <text
+         style="font-size:12px;font-style:normal;font-variant:normal;font-weight:600;font-stretch:normal;text-align:center;line-height:125%;writing-mode:lr-tb;text-anchor:middle;fill:#33424f;stroke:none;font-family:Open Sans;-inkscape-font-specification:Open Sans Semi-Bold"
+         id="text109"
+         x="68.675781"
+         y="53.362823"
+         sodipodi:linespacing="125%">
+        <tspan
+           sodipodi:role="line"
+           id="tspan4550"
+           x="68.675781"
+           y="53.362823">streaming</tspan>
+        <tspan
+           sodipodi:role="line"
+           id="tspan4552"
+           x="68.675781"
+           y="68.362823">data</tspan>
+      </text>
+      <text
+         style="line-height:125%;fill:#33424f;stroke:none"
+         id="text115"
+         x="474.12738"
+         y="145.23154"
+         sodipodi:linespacing="125%">
+        <tspan
+           style="font-size:12px;font-style:normal;font-variant:normal;font-weight:600;font-stretch:normal;text-align:start;line-height:125%;writing-mode:lr-tb;text-anchor:start;fill:#33424f;font-family:Open Sans;-inkscape-font-specification:Open Sans Semi-Bold"
+           id="tspan117"
+           textLength="43.283203"
+           y="158.23154"
+           x="479.33273"
+           font-weight="bold"
+           font-size="12">client</tspan>
+      </text>
+      <line
+         style="fill:none;stroke:#7f95a7;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;marker-end:url(#FilledArrow_Marker)"
+         id="line119"
+         y2="56.438995"
+         x2="132.23264"
+         y1="56.438995"
+         x1="106.93243" />
+      <text
+         style="font-size:12px;font-style:normal;font-variant:normal;font-weight:600;font-stretch:normal;text-align:start;line-height:125%;writing-mode:lr-tb;text-anchor:start;fill:#33424f;stroke:none;font-family:Open Sans;-inkscape-font-specification:Open Sans Semi-Bold"
+         id="text121"
+         x="61.175785"
+         y="253.6384"
+         sodipodi:linespacing="125%">
+        <tspan
+           style="font-size:12px;font-style:normal;font-variant:normal;font-weight:600;font-stretch:normal;text-align:start;line-height:125%;writing-mode:lr-tb;text-anchor:start;fill:#33424f;font-family:Open Sans;-inkscape-font-specification:Open Sans Semi-Bold"
+           id="tspan123"
+           textLength="32.71289"
+           y="266.6384"
+           x="65.447662"
+           font-weight="bold"
+           font-size="12">batch</tspan>
+        <tspan
+           style="font-size:12px;font-style:normal;font-variant:normal;font-weight:600;font-stretch:normal;text-align:start;line-height:125%;writing-mode:lr-tb;text-anchor:start;fill:#33424f;font-family:Open Sans;-inkscape-font-specification:Open Sans Semi-Bold"
+           id="tspan125"
+           textLength="26.115234"
+           y="283.6384"
+           x="68.74649"
+           font-weight="bold"
+           font-size="12">data</tspan>
+      </text>
+      <line
+         style="fill:none;stroke:#7f95a7;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;marker-end:url(#FilledArrow_Marker)"
+         id="line127"
+         y2="270.6384"
+         x2="132.73264"
+         y1="270.6384"
+         x1="107.43243" />
+      <line
+         style="fill:none;stroke:#7f95a7;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;marker-end:url(#FilledArrow_Marker)"
+         id="line129"
+         y2="243.0784"
+         x2="159.79263"
+         y1="74.938965"
+         x1="159.79263" />
+      <path
+         style="fill:none;stroke:#7f95a7;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;marker-start:url(#FilledArrow_Marker_2);marker-end:url(#FilledArrow_Marker)"
+         d="m 185.06378,57.75783 214.03664,87.3856"
+         id="line131"
+         inkscape:connector-curvature="0"
+         sodipodi:nodetypes="cc" />
+      <path
+         style="fill:none;stroke:#7f95a7;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;marker-end:url(#FilledArrow_Marker)"
+         d="m 178.29264,270.63837 121.01422,0"
+         id="line133"
+         inkscape:connector-curvature="0"
+         sodipodi:nodetypes="cc" />
+      <line
+         style="fill:none;stroke:#7f95a7;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;marker-start:url(#FilledArrow_Marker_2);marker-end:url(#FilledArrow_Marker)"
+         id="line135"
+         y2="180.64258"
+         x2="405.93555"
+         y1="245.13406"
+         x1="355.03683" />
+      <line
+         style="fill:none;stroke:#7f95a7;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;marker-end:url(#FilledArrow_Marker)"
+         id="line137"
+         y2="155.13821"
+         x2="398.50443"
+         y1="155.13821"
+         x1="353.40796" />
+      <line
+         style="fill:none;stroke:#7f95a7;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;marker-end:url(#FilledArrow_Marker)"
+         id="line139"
+         y2="167.45596"
+         x2="243.0354"
+         y1="155.9173"
+         x1="243.03348" />
+      <path
+         style="fill:none;stroke:#7f95a7;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;marker-start:url(#FilledArrow_Marker_2);marker-end:url(#FilledArrow_Marker)"
+         d="m 277.8411,176.62586 30.29726,-9.86829"
+         id="line141"
+         inkscape:connector-curvature="0"
+         sodipodi:nodetypes="cc" />
+      <path
+         style="fill:none;stroke:#7f95a7;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;marker-start:url(#FilledArrow_Marker_2);marker-end:url(#FilledArrow_Marker)"
+         d="M 184.42804,68.73894 308.5797,140.29898"
+         id="line143"
+         inkscape:connector-curvature="0"
+         sodipodi:nodetypes="cc" />
+      <line
+         style="fill:none;stroke:#7f95a7;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;marker-end:url(#FilledArrow_Marker)"
+         id="line145"
+         y2="113.87802"
+         x2="218.83446"
+         y1="73.660522"
+         x1="177.49472" />
+      <line
+         style="fill:none;stroke:#7f95a7;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;marker-start:url(#FilledArrow_Marker_2);marker-end:url(#FilledArrow_Marker)"
+         id="line147"
+         y2="182.69818"
+         x2="334.90796"
+         y1="243.0784"
+         x1="334.90796" />
+      <path
+         d="m 142.63817,36.49612 30,0 c 1.65685,0 3,1.34314 3,3 l 0,30 c 0,1.65686 -1.34315,3 -3,3 l -30,0 c -1.65685,0 -3,-1.34314 -3,-3 l 0,-30 c 0,-1.65686 1.34315,-3 3,-3 z"
+         id="path177"
+         inkscape:connector-curvature="0"
+         style="fill:#9dde57;stroke:none" />
+      <path
+         d="m 142.63817,36.49611 30,0 c 1.65685,0 3,1.34315 3,3 l 0,30 c 0,1.65686 -1.34315,3 -3,3 l -30,0 c -1.65685,0 -3,-1.34314 -3,-3 l 0,-30 c 0,-1.65685 1.34315,-3 3,-3 z"
+         id="path179"
+         inkscape:connector-curvature="0"
+         style="fill:none;stroke:#75b035;stroke-width:1;stroke-linecap:round;stroke-linejoin:round" />
+      <text
+         y="59.447937"
+         x="142.0069"
+         id="text3436"
+         sodipodi:linespacing="125%"
+         style="font-size:8px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-align:start;line-height:125%;writing-mode:lr-tb;text-anchor:start;fill:#ffffff;stroke:none;font-family:Open Sans;-inkscape-font-specification:Open Sans">
+        <tspan
+           sodipodi:role="line"
+           id="tspan4273"
+           x="142.0069"
+           y="59.447937">realtime</tspan>
+        <tspan
+           sodipodi:role="line"
+           id="tspan4275"
+           x="142.0069"
+           y="69.447937">nodes</tspan>
+      </text>
+      <path
+         d="m 311.90795,252.6384 46.0002,0 c 1.65685,0 3,1.34315 3,3 l 0,30 c 0,1.65685 -1.34315,3 -3,3 l -46.0002,0 c -1.65686,0 -3,-1.34315 -3,-3 l 0,-30 c 0,-1.65685 1.34314,-3 3,-3 z"
+         id="path186"
+         inkscape:connector-curvature="0"
+         style="fill:#687de9;stroke:none"
+         sodipodi:nodetypes="sssssssss" />
+      <path
+         d="m 311.90795,252.6384 46.0002,0 c 1.65685,0 3,1.34315 3,3 l 0,30 c 0,1.65685 -1.34315,3 -3,3 l -46.0002,0 c -1.65686,0 -3,-1.34315 -3,-3 l 0,-30 c 0,-1.65685 1.34314,-3 3,-3 z"
+         id="path188"
+         inkscape:connector-curvature="0"
+         style="fill:none;stroke:#3446b0;stroke-width:1;stroke-linecap:round;stroke-linejoin:round"
+         sodipodi:nodetypes="sssssssss" />
+      <text
+         id="text190"
+         style="font-size:8px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-align:start;line-height:125%;writing-mode:lr-tb;text-anchor:start;fill:#ffffff;stroke:none;font-family:Sans;-inkscape-font-specification:Sans"
+         x="311.92163"
+         y="274.90717"
+         sodipodi:linespacing="125%">
+        <tspan
+           sodipodi:role="line"
+           id="tspan4477"
+           x="311.92163"
+           y="274.90717">historical</tspan>
+        <tspan
+           sodipodi:role="line"
+           id="tspan4479"
+           x="311.92163"
+           y="284.90717">nodes</tspan>
+      </text>
+      <path
+         d="m 228.0304,119.4173 30,0 c 1.65685,0 3,1.34315 3,3 l 0,30 c 0,1.65685 -1.34315,3 -3,3 l -30,0 c -1.65685,0 -3,-1.34315 -3,-3 l 0,-30 c 0,-1.65685 1.34315,-3 3,-3 z"
+         id="path195"
+         inkscape:connector-curvature="0"
+         style="opacity:0.5;fill:#fd664a;stroke:none;filter:url(#filter4687)" />
+      <path
+         d="m 228.0304,119.4173 30,0 c 1.65685,0 3,1.34315 3,3 l 0,30 c 0,1.65685 -1.34315,3 -3,3 l -30,0 c -1.65685,0 -3,-1.34315 -3,-3 l 0,-30 c 0,-1.65685 1.34315,-3 3,-3 z"
+         id="path197"
+         inkscape:connector-curvature="0"
+         style="opacity:0.5;fill:none;stroke:#f3472c;stroke-width:1;stroke-linecap:round;stroke-linejoin:round;filter:url(#filter4683)" />
+      <text
+         y="151.71964"
+         x="227.10298"
+         id="text199"
+         style="font-size:8px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-align:start;line-height:125%;writing-mode:lr-tb;text-anchor:start;fill:#ffffff;stroke:none;font-family:Sans;-inkscape-font-specification:Sans"
+         sodipodi:linespacing="125%">
+        <tspan
+           sodipodi:role="line"
+           id="tspan4291"
+           x="227.10298"
+           y="151.71964">MySQL</tspan>
+      </text>
+      <path
+         d="m 220.03055,177.01595 45.99985,0 c 1.65685,0 3,1.34314 3,3 l 0,30 c 0,1.65685 -1.34315,3 -3,3 l -45.99985,0 c -1.65685,0 -3,-1.34315 -3,-3 l 0,-30 c 0,-1.65686 1.34315,-3 3,-3 z"
+         id="path204"
+         inkscape:connector-curvature="0"
+         style="fill:#3fbab2;stroke:none"
+         sodipodi:nodetypes="sssssssss" />
+      <path
+         d="m 220.03055,177.01595 45.99985,0 c 1.65685,0 3,1.34314 3,3 l 0,30 c 0,1.65685 -1.34315,3 -3,3 l -45.99985,0 c -0.82843,0 -1.57843,-0.33579 -2.12132,-0.87868 -0.54289,-0.54289 -0.87868,-1.29289 -0.87868,-2.12132 l 0,-15 0,-15 c 0,-0.82843 0.33579,-1.57843 0.87868,-2.12132 0.54289,-0.5429 1.29289,-0.87868 2.12132,-0.87868 z"
+         id="path206"
+         inkscape:connector-curvature="0"
+         style="fill:none;stroke:#1e9189;stroke-width:1;stroke-linecap:round;stroke-linejoin:round"
+         sodipodi:nodetypes="sssssssscsss" />
+      <text
+         sodipodi:linespacing="125%"
+         id="text208"
+         style="font-size:8px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-align:start;line-height:125%;writing-mode:lr-tb;text-anchor:start;fill:#ffffff;stroke:none;font-family:Sans;-inkscape-font-specification:Sans"
+         x="218.88231"
+         y="200.61603">
+        <tspan
+           sodipodi:role="line"
+           id="tspan4489"
+           x="218.88231"
+           y="200.61603">coordinator</tspan>
+        <tspan
+           sodipodi:role="line"
+           id="tspan4491"
+           x="218.88231"
+           y="210.61603">nodes</tspan>
+      </text>
+      <path
+         d="m 144.79263,252.63839 30,0 c 1.65685,0 3,1.34315 3,3 l 0,30 c 0,1.65686 -1.34315,3 -3,3 l -30,0 c -1.65685,0 -3,-1.34314 -3,-3 l 0,-30 c 0,-1.65685 1.34315,-3 3,-3 z"
+         id="path213"
+         inkscape:connector-curvature="0"
+         style="opacity:0.5;fill:#5ec2f2;stroke:none;filter:url(#filter4655)" />
+      <path
+         d="m 144.79263,252.63839 30,0 c 1.65685,0 3,1.34315 3,3 l 0,30 c 0,1.65686 -1.34315,3 -3,3 l -30,0 c -1.65685,0 -3,-1.34314 -3,-3 l 0,-30 c 0,-1.65685 1.34315,-3 3,-3 z"
+         id="path215"
+         inkscape:connector-curvature="0"
+         style="opacity:0.5;fill:none;stroke:#44a8d9;stroke-width:1;stroke-linecap:round;stroke-linejoin:round;filter:url(#filter4651)" />
+      <text
+         id="text217"
+         style="font-size:8px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-align:start;line-height:125%;writing-mode:lr-tb;text-anchor:start;fill:#ffffff;stroke:none;font-family:Sans;-inkscape-font-specification:Sans"
+         x="144.0856"
+         y="274.63846"
+         sodipodi:linespacing="125%">
+        <tspan
+           sodipodi:role="line"
+           id="tspan4485"
+           x="144.0856"
+           y="274.63846">deep</tspan>
+        <tspan
+           sodipodi:role="line"
+           id="tspan4487"
+           x="144.0856"
+           y="284.63846">storage</tspan>
+      </text>
+      <path
+         d="m 319.90796,137.13819 30,0 c 1.65686,0 3,1.34315 3,3 l 0,30 c 0,1.65686 -1.34314,3 -3,3 l -30,0 c -1.65685,0 -3,-1.34314 -3,-3 l 0,-30 c 0,-1.65685 1.34315,-3 3,-3 z"
+         id="path222"
+         inkscape:connector-curvature="0"
+         style="opacity:0.5;fill:#d443a4;stroke:none;filter:url(#filter4679)" />
+      <path
+         d="m 319.90796,137.13819 30,0 c 1.65686,0 3,1.34315 3,3 l 0,30 c 0,1.65686 -1.34314,3 -3,3 l -30,0 c -1.65685,0 -3,-1.34314 -3,-3 l 0,-30 c 0,-1.65685 1.34315,-3 3,-3 z"
+         id="path224"
+         inkscape:connector-curvature="0"
+         style="opacity:0.5;fill:none;stroke:#ad3184;stroke-width:1;stroke-linecap:round;stroke-linejoin:round;filter:url(#filter4675)" />
+      <text
+         sodipodi:linespacing="125%"
+         id="text226"
+         style="font-size:8px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-align:start;line-height:125%;writing-mode:lr-tb;text-anchor:start;fill:#ffffff;stroke:none;font-family:Sans;-inkscape-font-specification:Sans"
+         x="318.52225"
+         y="159.69537">
+        <tspan
+           sodipodi:role="line"
+           id="tspan4309"
+           x="318.52225"
+           y="159.69537">Zoo</tspan>
+        <tspan
+           sodipodi:role="line"
+           id="tspan4311"
+           x="318.52225"
+           y="169.69537">Keeper</tspan>
+      </text>
+      <line
+         style="fill:none;stroke:#7f95a7;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;marker-start:url(#FilledArrow_Marker_2);marker-end:url(#FilledArrow_Marker)"
+         id="line293"
+         y2="154.63828"
+         x2="467.89215"
+         y1="154.63824"
+         x1="453.12442" />
+      <path
+         d="m 411.06442,137.13821 30,0 c 1.65685,0 3,1.34314 3,3 l 0,30 c 0,1.65685 -1.34315,3 -3,3 l -30,0 c -1.65687,0 -3,-1.34315 -3,-3 l 0,-30 c 0,-1.65686 1.34313,-3 3,-3 z"
+         id="path296"
+         inkscape:connector-curvature="0"
+         style="fill:#fbae4e;stroke:none" />
+      <path
+         d="m 411.06442,137.13821 30,0 c 1.65685,0 3,1.34314 3,3 l 0,30 c 0,1.65685 -1.34315,3 -3,3 l -30,0 c -1.65687,0 -3,-1.34315 -3,-3 l 0,-30 c 0,-1.65686 1.34313,-3 3,-3 z"
+         id="path298"
+         inkscape:connector-curvature="0"
+         style="fill:none;stroke:#e48819;stroke-width:1;stroke-linecap:round;stroke-linejoin:round" />
+      <text
+         id="text300"
+         style="font-size:8px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-align:start;line-height:125%;writing-mode:lr-tb;text-anchor:start;fill:#ffffff;stroke:none;font-family:Sans;-inkscape-font-specification:Sans"
+         x="409.95114"
+         y="159.77753"
+         sodipodi:linespacing="125%">
+        <tspan
+           sodipodi:role="line"
+           id="tspan4481"
+           x="409.95114"
+           y="159.77753">broker</tspan>
+        <tspan
+           sodipodi:role="line"
+           id="tspan4483"
+           x="409.95114"
+           y="169.77753">nodes</tspan>
+      </text>
+    </g>
+  </g>
+</svg>
diff --git a/docs/content/Data-Flow.md b/docs/content/Data-Flow.md
new file mode 100644
index 00000000000..5d2dbf6503a
--- /dev/null
+++ b/docs/content/Data-Flow.md
@@ -0,0 +1,8 @@
+---
+layout: doc_page
+---
+
+# Data Flow
+
+<img src="../img/druid-dataflow-2x.png" width="800" height="434">
+
diff --git a/docs/img/druid-dataflow-2x.png b/docs/img/druid-dataflow-2x.png
new file mode 100644
index 00000000000..746b91e13b4
Binary files /dev/null and b/docs/img/druid-dataflow-2x.png differ