tutorials/013 - Merging Datasets on S3.ipynb

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   "source": [
    "[![AWS SDK for pandas](_static/logo.png \"AWS SDK for pandas\")](https://github.com/aws/aws-sdk-pandas)\n",
    "\n",
    "# 13 - Merging Datasets on S3\n",
    "\n",
    "awswrangler has 3 different copy modes to store Parquet Datasets on Amazon S3.\n",
    "\n",
    "- **append** (Default)\n",
    "\n",
    "    Only adds new files without any delete.\n",
    "    \n",
    "- **overwrite**\n",
    "\n",
    "    Deletes everything in the target directory and then add new files.\n",
    "    \n",
    "- **overwrite_partitions** (Partition Upsert)\n",
    "\n",
    "    Only deletes the paths of partitions that should be updated and then writes the new partitions files. It's like a \"partition Upsert\"."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "outputs": [],
   "source": [
    "from datetime import date\n",
    "\n",
    "import pandas as pd\n",
    "\n",
    "import awswrangler as wr"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Enter your bucket name:"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
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   "outputs": [
    {
     "name": "stdin",
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     "text": [
      " ············\n"
     ]
    }
   ],
   "source": [
    "import getpass\n",
    "\n",
    "bucket = getpass.getpass()\n",
    "path1 = f\"s3://{bucket}/dataset1/\"\n",
    "path2 = f\"s3://{bucket}/dataset2/\""
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Creating Dataset 1"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [
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       "  <thead>\n",
       "    <tr style=\"text-align: right;\">\n",
       "      <th></th>\n",
       "      <th>id</th>\n",
       "      <th>value</th>\n",
       "      <th>date</th>\n",
       "    </tr>\n",
       "  </thead>\n",
       "  <tbody>\n",
       "    <tr>\n",
       "      <th>0</th>\n",
       "      <td>1</td>\n",
       "      <td>foo</td>\n",
       "      <td>2020-01-01</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>1</th>\n",
       "      <td>2</td>\n",
       "      <td>boo</td>\n",
       "      <td>2020-01-02</td>\n",
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      "text/plain": [
       "   id value        date\n",
       "0   1   foo  2020-01-01\n",
       "1   2   boo  2020-01-02"
      ]
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     "execution_count": 3,
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   "source": [
    "df = pd.DataFrame({\"id\": [1, 2], \"value\": [\"foo\", \"boo\"], \"date\": [date(2020, 1, 1), date(2020, 1, 2)]})\n",
    "\n",
    "wr.s3.to_parquet(df=df, path=path1, dataset=True, mode=\"overwrite\", partition_cols=[\"date\"])\n",
    "\n",
    "wr.s3.read_parquet(path1, dataset=True)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Creating Dataset 2"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {},
   "outputs": [
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       "      <th>id</th>\n",
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       "      <th>date</th>\n",
       "    </tr>\n",
       "  </thead>\n",
       "  <tbody>\n",
       "    <tr>\n",
       "      <th>0</th>\n",
       "      <td>2</td>\n",
       "      <td>xoo</td>\n",
       "      <td>2020-01-02</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>1</th>\n",
       "      <td>3</td>\n",
       "      <td>bar</td>\n",
       "      <td>2020-01-03</td>\n",
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       "   id value        date\n",
       "0   2   xoo  2020-01-02\n",
       "1   3   bar  2020-01-03"
      ]
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     "execution_count": 4,
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   "source": [
    "df = pd.DataFrame({\"id\": [2, 3], \"value\": [\"xoo\", \"bar\"], \"date\": [date(2020, 1, 2), date(2020, 1, 3)]})\n",
    "\n",
    "dataset2_files = wr.s3.to_parquet(df=df, path=path2, dataset=True, mode=\"overwrite\", partition_cols=[\"date\"])[\"paths\"]\n",
    "\n",
    "wr.s3.read_parquet(path2, dataset=True)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Merging (Dataset 2 -> Dataset 1) (APPEND)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {},
   "outputs": [
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       "      <th></th>\n",
       "      <th>id</th>\n",
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       "      <th>date</th>\n",
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       "      <td>2020-01-01</td>\n",
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       "    <tr>\n",
       "      <th>1</th>\n",
       "      <td>2</td>\n",
       "      <td>xoo</td>\n",
       "      <td>2020-01-02</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>2</th>\n",
       "      <td>2</td>\n",
       "      <td>boo</td>\n",
       "      <td>2020-01-02</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>3</th>\n",
       "      <td>3</td>\n",
       "      <td>bar</td>\n",
       "      <td>2020-01-03</td>\n",
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      "text/plain": [
       "   id value        date\n",
       "0   1   foo  2020-01-01\n",
       "1   2   xoo  2020-01-02\n",
       "2   2   boo  2020-01-02\n",
       "3   3   bar  2020-01-03"
      ]
     },
     "execution_count": 5,
     "metadata": {},
     "output_type": "execute_result"
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   "source": [
    "wr.s3.merge_datasets(source_path=path2, target_path=path1, mode=\"append\")\n",
    "\n",
    "wr.s3.read_parquet(path1, dataset=True)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Merging (Dataset 2 -> Dataset 1) (OVERWRITE_PARTITIONS)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
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   "outputs": [
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       "      <td>2020-01-01</td>\n",
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       "    <tr>\n",
       "      <th>1</th>\n",
       "      <td>2</td>\n",
       "      <td>xoo</td>\n",
       "      <td>2020-01-02</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>2</th>\n",
       "      <td>3</td>\n",
       "      <td>bar</td>\n",
       "      <td>2020-01-03</td>\n",
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      "text/plain": [
       "   id value        date\n",
       "0   1   foo  2020-01-01\n",
       "1   2   xoo  2020-01-02\n",
       "2   3   bar  2020-01-03"
      ]
     },
     "execution_count": 6,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "wr.s3.merge_datasets(source_path=path2, target_path=path1, mode=\"overwrite_partitions\")\n",
    "\n",
    "wr.s3.read_parquet(path1, dataset=True)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Merging (Dataset 2 -> Dataset 1) (OVERWRITE)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {},
   "outputs": [
    {
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       "      <th></th>\n",
       "      <th>id</th>\n",
       "      <th>value</th>\n",
       "      <th>date</th>\n",
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       "  </thead>\n",
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       "      <th>0</th>\n",
       "      <td>2</td>\n",
       "      <td>xoo</td>\n",
       "      <td>2020-01-02</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>1</th>\n",
       "      <td>3</td>\n",
       "      <td>bar</td>\n",
       "      <td>2020-01-03</td>\n",
       "    </tr>\n",
       "  </tbody>\n",
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      "text/plain": [
       "   id value        date\n",
       "0   2   xoo  2020-01-02\n",
       "1   3   bar  2020-01-03"
      ]
     },
     "execution_count": 7,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "wr.s3.merge_datasets(source_path=path2, target_path=path1, mode=\"overwrite\")\n",
    "\n",
    "wr.s3.read_parquet(path1, dataset=True)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Cleaning Up"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 8,
   "metadata": {},
   "outputs": [],
   "source": [
    "wr.s3.delete_objects(path1)\n",
    "wr.s3.delete_objects(path2)"
   ]
  }
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