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Posted to common-issues@hadoop.apache.org by "Steve Loughran (Jira)" <ji...@apache.org> on 2022/12/15 17:05:00 UTC

[jira] [Created] (HADOOP-18577) ABFS: add probes of readahead fix

Steve Loughran created HADOOP-18577:
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             Summary: ABFS: add probes of readahead fix
                 Key: HADOOP-18577
                 URL: https://issues.apache.org/jira/browse/HADOOP-18577
             Project: Hadoop Common
          Issue Type: Sub-task
          Components: fs/azure
    Affects Versions: 3.3.5
            Reporter: Steve Loughran
            Assignee: Steve Loughran



Followup patch as to  HADOOP-18456 to
aid in probing for read correctness of
hadoop ABFS client across different releases.

* ReadBufferManager constructor logs the fact it is safe at TRACE
* AbfsInputStream declares it is fixed in toString()
  by including fs.azure.capability.readahead.safe" in the
  result.

The ABFS FileSystem hasPathCapability("fs.azure.capability.readahead.safe")
probe returns true to indicate the client's readahead manager has been fixed
to be safe when prefetching.

All Hadoop releases for which probe this returns false
and for which the probe "fs.capability.etags.available"
returns true at risk of returning invalid data when reading
ADLS Gen2/Azure storage data.




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