IMPALA-4029: [DOCS] Include known issue for 'flat buffers' change Change-Id: I65495748984268763b2690c193488a338409e13e Reviewed-on: http://gerrit.cloudera.org:8080/7236 Reviewed-by: John Russell <[email protected]> Tested-by: Impala Public Jenkins
Project: http://git-wip-us.apache.org/repos/asf/incubator-impala/repo Commit: http://git-wip-us.apache.org/repos/asf/incubator-impala/commit/91dbeb3c Tree: http://git-wip-us.apache.org/repos/asf/incubator-impala/tree/91dbeb3c Diff: http://git-wip-us.apache.org/repos/asf/incubator-impala/diff/91dbeb3c Branch: refs/heads/master Commit: 91dbeb3c061292c832b069bdf07fb76533332f23 Parents: 384e864 Author: John Russell <[email protected]> Authored: Tue Jun 20 14:27:19 2017 -0700 Committer: Impala Public Jenkins <[email protected]> Committed: Tue Jun 27 00:17:03 2017 +0000 ---------------------------------------------------------------------- docs/topics/impala_known_issues.xml | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) ---------------------------------------------------------------------- http://git-wip-us.apache.org/repos/asf/incubator-impala/blob/91dbeb3c/docs/topics/impala_known_issues.xml ---------------------------------------------------------------------- diff --git a/docs/topics/impala_known_issues.xml b/docs/topics/impala_known_issues.xml index 75c9d2d..c3f1e51 100644 --- a/docs/topics/impala_known_issues.xml +++ b/docs/topics/impala_known_issues.xml @@ -564,6 +564,32 @@ https://issues.apache.org/jira/browse/IMPALA-2144 - Don't have </conbody> + <concept id="flatbuffers_mem_usage"> + <title>Memory usage when compact_catalog_topic flag enabled</title> + <conbody> + <p> + The efficiency improvement from <xref keyref="IMPALA-4029">IMPALA-4029</xref> + can cause an increase in size of the updates to Impala catalog metadata + that are broadcast to the <cmdname>impalad</cmdname> daemons + by the <cmdname>statestored</cmdname> daemon. + The increase in catalog update topic size results in higher CPU and network + utilization. By default, the increase in topic size is about 5-7%. If the + <codeph>compact_catalog_topic</codeph> flag is used, the + size increase is more substantial, with a topic size approximately twice as + large as in previous versions. + </p> + <p><b>Bug:</b> <xref keyref="IMPALA-5500">IMPALA-5500</xref></p> + <p><b>Severity:</b> Medium</p> + <p> + <b>Workaround:</b> Consider leaving the <codeph>compact_catalog_topic</codeph> + configuration setting at its default value of <codeph>false</codeph> until + this issue is resolved. + </p> + <p><b>Resolution:</b> A fix is in the pipeline. Check the status of + <xref keyref="IMPALA-5500">IMPALA-5500</xref> for the release where the fix is available.</p> + </conbody> + </concept> + <concept id="drop_table_purge_s3a"> <title>DROP TABLE PURGE on S3A table may not delete externally written files</title> <conbody>
