{"id":58,"date":"2024-04-17T22:46:22","date_gmt":"2024-04-17T22:46:22","guid":{"rendered":"https:\/\/www.rajeshkumar.xyz\/blog\/?p=58"},"modified":"2024-04-29T19:21:02","modified_gmt":"2024-04-29T19:21:02","slug":"checklist-for-troubleshooting-performance-issues-in-solr","status":"publish","type":"post","link":"https:\/\/www.rajeshkumar.xyz\/blog\/checklist-for-troubleshooting-performance-issues-in-solr\/","title":{"rendered":"Checklist for troubleshooting performance issues in Solr"},"content":{"rendered":"\n<p><strong>Gather information:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Solr version:<\/strong>\u00a0Different Solr versions may have different performance characteristics.<\/li>\n\n\n\n<li><strong>Hardware specifications:<\/strong>\u00a0CPU, memory, disk type (HDD or SSD), and available resources can impact Solr&#8217;s performance.<\/li>\n\n\n\n<li><strong>Solr configuration:<\/strong>\u00a0Review key configurations like schema, indexing parameters, query result cache size, and buffer sizes.<\/li>\n\n\n\n<li><strong>Queries:<\/strong>\u00a0Analyze the queries being issued to Solr. Complex queries or those with poor selectivity can slow down performance.<\/li>\n\n\n\n<li><strong>Solr logs:<\/strong>\u00a0Check Solr logs for errors, warnings, or slow queries.<\/li>\n<\/ul>\n\n\n\n<p>Troubleshooting performance issues in Apache Solr, a popular open-source search platform, requires a systematic approach to identify and resolve bottlenecks or inefficiencies. Here is a comprehensive checklist to guide you through troubleshooting performance issues in Solr:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1. <strong>System Hardware<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Memory<\/strong>: Ensure there is adequate RAM for Solr and the operating system. Check if swapping is occurring, which can significantly degrade performance.<\/li>\n\n\n\n<li><strong>CPU<\/strong>: Monitor CPU usage to see if it is a bottleneck. Look for high user or system CPU time.<\/li>\n\n\n\n<li><strong>Disk I\/O<\/strong>: Verify that the disk I\/O is not saturated. Use tools like <code>iostat<\/code> to monitor disk performance.<\/li>\n\n\n\n<li><strong>Network<\/strong>: Check network bandwidth and latency to ensure there are no delays in data transmission, especially in a distributed environment.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">2. <strong>Solr Configuration<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>SolrCores and Collections<\/strong>: Review the configuration settings for each core or collection. Ensure that configurations are optimized based on the specific use case.<\/li>\n\n\n\n<li><strong>Shards and Replicas<\/strong>: In a clustered environment, ensure that the number of shards and replicas is appropriate for the data volume and query load.<\/li>\n\n\n\n<li><strong>Caching<\/strong>: Review cache settings (filter cache, query result cache, document cache) to ensure they are properly configured to optimize performance.<\/li>\n\n\n\n<li><strong>Commit Frequency<\/strong>: Adjust the commit settings to balance between indexing speed and data durability.<\/li>\n\n\n\n<li><strong>Garbage Collection (GC)<\/strong>: Monitor GC logs to identify excessive GC pauses that might affect performance.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">3. <strong>Query Performance<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Query Construction<\/strong>: Check if queries are optimally constructed. Avoid overly complex queries that can degrade performance.<\/li>\n\n\n\n<li><strong>Faceting, Highlighting, and More<\/strong>: Analyze the impact of computationally expensive operations like faceting and highlighting.<\/li>\n\n\n\n<li><strong>Filter Queries<\/strong>: Utilize filter queries for common filters that can be cached to improve performance.<\/li>\n\n\n\n<li><strong>Query Parsing<\/strong>: Ensure that the query parser settings are suitable for the use case.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">4. <strong>Indexing Performance<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Document Size and Complexity<\/strong>: Large or complex documents can slow down indexing. Optimize document structure.<\/li>\n\n\n\n<li><strong>Batch Size<\/strong>: Optimize the size of indexing batches. Too large or too small batches can affect performance.<\/li>\n\n\n\n<li><strong>Index Structure<\/strong>: Review and optimize the schema, including the use of appropriate field types and index-time tokenization.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">5. <strong>Logging and Monitoring<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Solr Logs<\/strong>: Regularly review Solr logs for warnings and errors that can indicate potential issues.<\/li>\n\n\n\n<li><strong>Monitoring Tools<\/strong>: Use monitoring tools like Solr&#8217;s built-in admin interface, Prometheus, Grafana, or others to gather performance metrics.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">6. <strong>System Tuning<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Operating System Tuning<\/strong>: Tune the operating system settings such as file descriptors and network settings.<\/li>\n\n\n\n<li><strong>JVM Options<\/strong>: Adjust Java Virtual Machine (JVM) settings for Solr, focusing on memory allocation, stack sizes, and GC options.<\/li>\n\n\n\n<li><strong>Solr JVM Dashboard<\/strong>: Utilize the Solr JVM dashboard to monitor memory usage, thread counts, and more.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">7. <strong>External Factors<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Third-party Applications<\/strong>: Check for other applications on the same hardware that might be consuming resources.<\/li>\n\n\n\n<li><strong>Load Balancers<\/strong>: Ensure that load balancers are correctly configured to distribute traffic effectively across Solr nodes.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">8. <strong>Testing and Benchmarks<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Stress Testing<\/strong>: Perform stress testing to understand the limits of the Solr setup and identify potential failure points.<\/li>\n\n\n\n<li><strong>Benchmarking<\/strong>: Use tools like Apache JMeter or Solr&#8217;s built-in benchmarking tools to measure performance under different conditions.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">List of commands for Ctroubleshooting performance issues in Solr<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Solr Info Commands<\/h3>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-1\" data-shcb-language-name=\"PHP\" data-shcb-language-slug=\"php\"><span><code class=\"hljs language-php\"><span class=\"hljs-comment\"># Solr core status<\/span>\nsolr status &#91;core_name]\n\n<span class=\"hljs-comment\"># Check query processing times<\/span>\nsolr stats\n\n<span class=\"hljs-comment\"># Analyze slow queries<\/span>\nsolr query -stats <span class=\"hljs-keyword\">true<\/span> &#91;query]\n\n<span class=\"hljs-comment\"># View Solr logs<\/span>\nsolr logs &#91;core_name]\n\n<span class=\"hljs-comment\"># Get Solr schema information<\/span>\nsolr get schema &#91;core_name]<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-1\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PHP<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">php<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<h3 class=\"wp-block-heading\"><strong>Checking System Metrics<\/strong><\/h3>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-2\" data-shcb-language-name=\"PHP\" data-shcb-language-slug=\"php\"><span><code class=\"hljs language-php\"><span class=\"hljs-comment\"># Memory Usage<\/span>\nfree -m   <span class=\"hljs-comment\"># Linux<\/span>\nvm_stat   <span class=\"hljs-comment\"># macOS<\/span>\n\n<span class=\"hljs-comment\"># CPU Load<\/span>\ntop\nhtop\nmpstat\n\n<span class=\"hljs-comment\"># Disk I\/O<\/span>\niostat\n\n<span class=\"hljs-comment\"># Network Performance<\/span>\nnetstat\niftop\n<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-2\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PHP<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">php<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<h3 class=\"wp-block-heading\"><strong>Solr Specific Commands<\/strong><\/h3>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-3\" data-shcb-language-name=\"PHP\" data-shcb-language-slug=\"php\"><span><code class=\"hljs language-php\"><span class=\"hljs-comment\"># Check Solr Status<\/span>\nbin\/solr status\n\n<span class=\"hljs-comment\"># Adjust Logging Levels via API<\/span>\ncurl <span class=\"hljs-string\">\"http:\/\/localhost:8983\/solr\/admin\/logging?wt=json&amp;set=root:WARN\"<\/span>\n<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-3\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PHP<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">php<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<h3 class=\"wp-block-heading\"><strong>Query Performance Analysis<\/strong><\/h3>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-4\" data-shcb-language-name=\"PHP\" data-shcb-language-slug=\"php\"><span><code class=\"hljs language-php\"><span class=\"hljs-comment\"># Execute Queries with Debug Information<\/span>\ncurl <span class=\"hljs-string\">\"http:\/\/localhost:8983\/solr\/collection_name\/select?q=*:*&amp;debugQuery=true\"<\/span>\n<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-4\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PHP<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">php<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<h3 class=\"wp-block-heading\"><strong>Index Inspection<\/strong><\/h3>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-5\" data-shcb-language-name=\"PHP\" data-shcb-language-slug=\"php\"><span><code class=\"hljs language-php\"><span class=\"hljs-comment\"># Index Statistics<\/span>\ncurl <span class=\"hljs-string\">\"http:\/\/localhost:8983\/solr\/collection_name\/admin\/luke?numTerms=0\"<\/span>\n\n<span class=\"hljs-comment\"># Schema Information<\/span>\ncurl <span class=\"hljs-string\">\"http:\/\/localhost:8983\/solr\/collection_name\/schema?wt=json\"<\/span>\n<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-5\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PHP<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">php<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<h3 class=\"wp-block-heading\">Caching Performance<\/h3>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-6\" data-shcb-language-name=\"PHP\" data-shcb-language-slug=\"php\"><span><code class=\"hljs language-php\"><span class=\"hljs-comment\"># Cache Statistics<\/span>\ncurl <span class=\"hljs-string\">\"http:\/\/localhost:8983\/solr\/collection_name\/cache.jsp\"<\/span>\n<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-6\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PHP<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">php<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<h3 class=\"wp-block-heading\">System and Configuration<\/h3>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-7\" data-shcb-language-name=\"PHP\" data-shcb-language-slug=\"php\"><span><code class=\"hljs language-php\"><span class=\"hljs-comment\"># Get a Thread Dump<\/span>\njstack -l &lt;PID&gt; &gt; threadDump.txt  <span class=\"hljs-comment\"># Replace &lt;PID&gt; with the process ID of the Solr server.<\/span>\n<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-7\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PHP<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">php<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<h3 class=\"wp-block-heading\">Performance Monitoring<\/h3>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-8\" data-shcb-language-name=\"PHP\" data-shcb-language-slug=\"php\"><span><code class=\"hljs language-php\"><span class=\"hljs-comment\"># JVM Monitoring with jconsole or VisualVM<\/span>\njconsole\nVisualVM\n<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-8\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PHP<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">php<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<h3 class=\"wp-block-heading\">Server Logs<\/h3>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-9\" data-shcb-language-name=\"PHP\" data-shcb-language-slug=\"php\"><span><code class=\"hljs language-php\"><span class=\"hljs-comment\"># View Solr Logs<\/span>\ntail -f \/path\/to\/solr\/server\/logs\/solr.log\n<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-9\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PHP<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">php<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<h3 class=\"wp-block-heading\"><strong>Load Testing<\/strong><\/h3>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-10\" data-shcb-language-name=\"CSS\" data-shcb-language-slug=\"css\"><span><code class=\"hljs language-css\"># <span class=\"hljs-selector-tag\">Using<\/span> <span class=\"hljs-selector-tag\">Apache<\/span> <span class=\"hljs-selector-tag\">JMeter<\/span> <span class=\"hljs-selector-tag\">for<\/span> <span class=\"hljs-selector-tag\">Load<\/span> <span class=\"hljs-selector-tag\">Testing<\/span>\n# <span class=\"hljs-selector-tag\">Note<\/span>: <span class=\"hljs-selector-tag\">This<\/span> <span class=\"hljs-selector-tag\">assumes<\/span> <span class=\"hljs-selector-tag\">JMeter<\/span> <span class=\"hljs-selector-tag\">is<\/span> <span class=\"hljs-selector-tag\">installed<\/span> <span class=\"hljs-selector-tag\">and<\/span> <span class=\"hljs-selector-tag\">set<\/span> <span class=\"hljs-selector-tag\">up<\/span>\n<span class=\"hljs-selector-tag\">jmeter<\/span> <span class=\"hljs-selector-tag\">-n<\/span> <span class=\"hljs-selector-tag\">-t<\/span> <span class=\"hljs-selector-tag\">test_plan<\/span><span class=\"hljs-selector-class\">.jmx<\/span> <span class=\"hljs-selector-tag\">-l<\/span> <span class=\"hljs-selector-tag\">test_results<\/span><span class=\"hljs-selector-class\">.jtl<\/span>\n<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-10\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">CSS<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">css<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>","protected":false},"excerpt":{"rendered":"<p>Gather information: Troubleshooting performance issues in Apache Solr, a popular open-source search platform, requires a systematic approach to identify and [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[],"class_list":["post-58","post","type-post","status-publish","format-standard","hentry","category-apache-solr"],"_links":{"self":[{"href":"https:\/\/www.rajeshkumar.xyz\/blog\/wp-json\/wp\/v2\/posts\/58","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.rajeshkumar.xyz\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.rajeshkumar.xyz\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.rajeshkumar.xyz\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.rajeshkumar.xyz\/blog\/wp-json\/wp\/v2\/comments?post=58"}],"version-history":[{"count":1,"href":"https:\/\/www.rajeshkumar.xyz\/blog\/wp-json\/wp\/v2\/posts\/58\/revisions"}],"predecessor-version":[{"id":59,"href":"https:\/\/www.rajeshkumar.xyz\/blog\/wp-json\/wp\/v2\/posts\/58\/revisions\/59"}],"wp:attachment":[{"href":"https:\/\/www.rajeshkumar.xyz\/blog\/wp-json\/wp\/v2\/media?parent=58"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.rajeshkumar.xyz\/blog\/wp-json\/wp\/v2\/categories?post=58"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.rajeshkumar.xyz\/blog\/wp-json\/wp\/v2\/tags?post=58"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}