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ASF subversion and git services commented on IMPALA-8691: --------------------------------------------------------- Commit 9874ce37a989240571e2473dce3153357a0e417f in impala's branch refs/heads/master from Michael Ho [ https://gitbox.apache.org/repos/asf?p=impala.git;h=9874ce3 ] IMPALA-8691: Query option to disable data cache This change adds a query option to disable the data cache for a given session. By default, this option is set to false. When it's set to true, all queries will by-pass the data cache. This allows users to avoid polluting the cache for accesses to tables which they don't want to cache. A follow-up change will add a per-table query hint to allow caching disabled for a given table only. There is some small refactoring in the code to make it clearer the type of caching being referred to in the code. As the code stands now, we have both HDFS caching (for local reads) and the data cache (for remote reads). BufferOpts has been extended to allow users to explicitly state intention for using either/both of the caches. Change-Id: I39122ac38435cedf94b2b39145863764d0b5b6c8 Reviewed-on: http://gerrit.cloudera.org:8080/14015 Reviewed-by: Tim Armstrong <tarmstr...@cloudera.com> Tested-by: Impala Public Jenkins <impala-public-jenk...@cloudera.com> > Query hint for disabling data caching > ------------------------------------- > > Key: IMPALA-8691 > URL: https://issues.apache.org/jira/browse/IMPALA-8691 > Project: IMPALA > Issue Type: Improvement > Components: Backend > Affects Versions: Impala 3.3.0 > Reporter: Michael Ho > Assignee: Michael Ho > Priority: Major > > IMPALA-8690 tracks the effort for a better eviction algorithm for the > Impala's data cache. As a short term workaround, it would be nice to allow > users to explicitly set certain tables as not cacheable via query hints or > simply disable caching for a query via query options. -- This message was sent by Atlassian Jira (v8.3.2#803003) --------------------------------------------------------------------- To unsubscribe, e-mail: issues-all-unsubscr...@impala.apache.org For additional commands, e-mail: issues-all-h...@impala.apache.org