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  1. HBase
  2. HBASE-27229

BucketCache statistics should not count evictions by hfile

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Details

    • Improvement
    • Status: Resolved
    • Major
    • Resolution: Fixed
    • None
    • 2.5.0, 3.0.0-alpha-4
    • None
    • None
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      The eviction metric for the BucketCache has been updated to only count evictions triggered by the eviction process (i.e responding to cache pressure). This brings it in-line with the other cache implementations, with the goal of this metric being to give operators insight into cache pressure. Other evictions by hfile or drain to storage engine failure, etc, no longer count towards the eviction rate.
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      The eviction metric for the BucketCache has been updated to only count evictions triggered by the eviction process (i.e responding to cache pressure). This brings it in-line with the other cache implementations, with the goal of this metric being to give operators insight into cache pressure. Other evictions by hfile or drain to storage engine failure, etc, no longer count towards the eviction rate.

    Description

      The eviction metrics are helpful for determining how much access-related churn there is in your block cache. The LruBlockCache properly ignores evictions by invalidation of HFile, but the BucketCache tracks them. 

      We should make the BucketCache work similarly so that one can get an accurate view of the evictions occurring through too much random access or too large working set.

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          Web Link GitHub Pull Request #4639

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              bbeaudreault Bryan Beaudreault
              bbeaudreault Bryan Beaudreault
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