feat: add homework

homework/task2.ipynb

@@ -0,0 +1,151 @@
+{
+ "cells": [
+  {
+   "cell_type": "code",
+   "execution_count": 26,
+   "id": "ed083f23-2556-4577-b770-36a087bf4566",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "from pyspark.sql import SparkSession\n",
+    "import pyspark.sql.functions as F\n",
+    "\n",
+    "spark = SparkSession.builder.appName(\"some_name\").getOrCreate()\n"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 27,
+   "id": "a9ae7a2b-7a96-4816-8b2d-8bf6b72aaffd",
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "+---------+----------+--------+----------------------------------+\n",
+      "|log_level|date      |time    |message                           |\n",
+      "+---------+----------+--------+----------------------------------+\n",
+      "|INFO     |2025-07-30|12:00:00|User logged in                    |\n",
+      "|DEBUG    |2025-07-30|12:01:00|Session started                   |\n",
+      "|ERROR    |2025-07-30|12:02:00|Database connection failed        |\n",
+      "|INFO     |2025-07-30|12:03:00|User clicked button               |\n",
+      "|ERROR    |2025-07-30|12:04:00|Timeout while waiting for response|\n",
+      "|DEBUG    |2025-07-30|12:05:00|Memory usage: 75%                 |\n",
+      "|ERROR    |2025-07-30|12:06:00|NullPointerException              |\n",
+      "+---------+----------+--------+----------------------------------+\n",
+      "\n"
+     ]
+    }
+   ],
+   "source": [
+    "parts = F.split(F.col(\"value\"), \" \", 4)\n",
+    "df_logs = spark.read.text(\"logs.txt\").select(\n",
+    "    parts[0].alias(\"log_level\"),\n",
+    "    parts[1].alias(\"date\"),\n",
+    "    parts[2].alias(\"time\"),\n",
+    "    parts[3].alias(\"message\")\n",
+    ")\n",
+    "\n",
+    "df_logs.show(truncate=False)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 28,
+   "id": "31c2f26f-9a47-4a60-9d46-de6c5742b524",
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "+---------+----------+--------+----------------------------------+\n",
+      "|log_level|date      |time    |message                           |\n",
+      "+---------+----------+--------+----------------------------------+\n",
+      "|ERROR    |2025-07-30|12:02:00|Database connection failed        |\n",
+      "|ERROR    |2025-07-30|12:04:00|Timeout while waiting for response|\n",
+      "|ERROR    |2025-07-30|12:06:00|NullPointerException              |\n",
+      "+---------+----------+--------+----------------------------------+\n",
+      "\n"
+     ]
+    }
+   ],
+   "source": [
+    "df_logs_error = df_logs.filter(F.col(\"log_level\") == \"ERROR\")\n",
+    "df_logs_error.show(truncate=False)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 29,
+   "id": "e3d10e1d-3c62-4c98-9404-81c9aa54d5f0",
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "+---------+----------+--------+----------------------------------+----+\n",
+      "|log_level|date      |time    |message                           |hour|\n",
+      "+---------+----------+--------+----------------------------------+----+\n",
+      "|ERROR    |2025-07-30|12:02:00|Database connection failed        |12  |\n",
+      "|ERROR    |2025-07-30|12:04:00|Timeout while waiting for response|12  |\n",
+      "|ERROR    |2025-07-30|12:06:00|NullPointerException              |12  |\n",
+      "+---------+----------+--------+----------------------------------+----+\n",
+      "\n"
+     ]
+    }
+   ],
+   "source": [
+    "df_logs_error = df_logs_error.withColumn(\"hour\", F.substring(\"time\", 1, 2).cast(\"int\"))\n",
+    "df_logs_error.show(truncate=False)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 30,
+   "id": "fd6d5a08-e464-4d62-bd93-7f118db53f6e",
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "+----+-----+\n",
+      "|hour|count|\n",
+      "+----+-----+\n",
+      "|  12|    3|\n",
+      "+----+-----+\n",
+      "\n"
+     ]
+    }
+   ],
+   "source": [
+    "df_count_errors_by_hour = df_logs_error.groupBy(\"hour\").count()\n",
+    "df_count_errors_by_hour.show()"
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 3 (ipykernel)",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.12.3"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 5
+}