[jira] [Created] (IMPALA-11883) erasure-coded-bytes-read metric doesn't work for Ozone

["Michael Smith (Jira)" <ji...@apache.org>]

Michael Smith created IMPALA-11883:
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             Summary: erasure-coded-bytes-read metric doesn't work for Ozone
                 Key: IMPALA-11883
                 URL: https://issues.apache.org/jira/browse/IMPALA-11883
             Project: IMPALA
          Issue Type: Bug
          Components: Backend
    Affects Versions: Impala 4.3.0
            Reporter: Michael Smith


The {{erasure-coded-bytes-read}} metric only works for HDFS because it relies on the HDFS-specific function {{hdfsFileGetReadStatistics}}. We have other ways to track bytes read: by looking at the actual read operations. {{hdfsFileGetReadStatistics}} is only needed for tracking things we don't have visibility into such as locality and short-circuit reads.

Update {{erasure-coded-bytes-read}} to gather metrics from actual reads similar to what we do for {{bytes-read}}. Note that the semantics are different: {{bytes-read}} includes reads from memory, local buffer, and cached files; we should omit those as they're not erasure-coded reads.



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