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bharath v resolved IMPALA-7424. ------------------------------- 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. -- This message was sent by Atlassian JIRA (v7.6.3#76005)