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https://issues.apache.org/jira/browse/NUTCH-3134?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Work on NUTCH-3134 started by Lewis John McGibbney.
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> Add latency metrics with percentile support to Fetcher, Parser, and Indexer
> ---------------------------------------------------------------------------
>
> Key: NUTCH-3134
> URL: https://issues.apache.org/jira/browse/NUTCH-3134
> Project: Nutch
> Issue Type: Sub-task
> Components: fetcher, indexer, parser
> Reporter: Lewis John McGibbney
> Assignee: Lewis John McGibbney
> Priority: Major
> Fix For: 1.22
>
>
> This task involves adding timing metrics to the fetching, parsing and
> indexing jobs. We could likely expand this to other jobs in the future but
> this is a good start. The timing metrics should come with percentile support
> using TDigest ([https://github.com/tdunning/t-digest)] which Nutch already
> depends on. This would enable tracking fetch latency, parse latency, and
> indexing latency with p50/p95/p99 insights exposed via Hadoop counters.
> Latency distributions will be useful for:
> * Identifying performance bottlenecks in crawl jobs
> * Tuning fetch/parse/index configurations
> * Detecting anomalies in processing times
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