Joe McDonnell created IMPALA-6232:
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Summary: Short circuit reads disabled when using Impala HDFS file
handle cache
Key: IMPALA-6232
URL: https://issues.apache.org/jira/browse/IMPALA-6232
Project: IMPALA
Issue Type: Bug
Components: Backend
Affects Versions: Impala 2.10.0
Reporter: Joe McDonnell
Assignee: Joe McDonnell
Priority: Blocker
In Impala 2.10, the HDFS file handle cache was enabled by default. However,
testing has revealed that in cases where files are overwritten or appended, the
file handle can encounter an error that causes HDFS to disable short circuit
reads for 10 minutes. See
[HDFS-12528|https://issues.apache.org/jira/browse/HDFS-12528].
Due to this performance impact and the associated unpredictability, Impala
should disable the file handle cache by default until this issue is resolved.
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