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https://issues.apache.org/jira/browse/IMPALA-6361?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tim Armstrong resolved IMPALA-6361.
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Resolution: Duplicate
> File handle cache should be shared across multiple IO threads
> -------------------------------------------------------------
>
> Key: IMPALA-6361
> URL: https://issues.apache.org/jira/browse/IMPALA-6361
> Project: IMPALA
> Issue Type: Improvement
> Components: Backend
> Affects Versions: Impala 2.10.0
> Reporter: Juan Yu
> Priority: Major
>
> A file handle can only be used by one thread at a time, cannot be shared
> across multiple IO threads due to statistics tracking issue. This leads to
> multiple file handle cache been created and added to cache. This still adds
> NN load and reduce the number of files can be cached.
> We should investigate a way to share a file handle across threads while
> maintaining appropriate statistics
> Another thing to improve is to improve the efficiency of the file handle
> cache. For example, reducing the size of the HDFS file handle itself would
> reduce the memory footprint and allow the cache to hold more entries in the
> same memory.
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