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https://issues.apache.org/jira/browse/IMPALA-7424?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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bharath v resolved IMPALA-7424.
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Resolution: Fixed
Fix Version/s: Impala 3.1.0
> Improve in-memory representation of incremental stats
> -----------------------------------------------------
>
> Key: IMPALA-7424
> URL: https://issues.apache.org/jira/browse/IMPALA-7424
> Project: IMPALA
> Issue Type: Sub-task
> Components: Catalog
> Affects Versions: Impala 2.13.0, Impala 3.1.0
> Reporter: bharath v
> Assignee: bharath v
> Priority: Major
> Fix For: Impala 3.1.0
>
>
> Incremental stats are stored in the HMS' parameters map as plain Java
> Strings. This is suboptimal since Java String class internally uses UTF-16
> encoding for the underlying bytes. The idea here is to switch to a byte array
> representation so that we can reduce the memory usage by half (8 bytes). We
> can also compress the byte array using gzip compression and lazily decompress
> them when needed (typically during the incremental stats computation's
> finalization phase).
> A prototype of this patch on a real-world Catalog dump showed ~54% JVM heap
> usage reduction (end-to-end) and ~79% reduction in the heap footprint for the
> incremental stats.
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