NUTCH-3141 Cache Hadoop Counter References in Hot Paths #878
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This is a patch for NUTCH-3141. The cache pattern is already implemented in FetcherThread so this PR introduces more consistency across the codebase.
Additionally, I discovered some classes (SitemapProcessor.java, CrawlDb.java and DeduplicationJob.java) still used hardcoded strings to lookup counters, so I replaced these instances with NutchMetrics constants for a cleaner consistent implementation.