Joe McDonnell has posted comments on this change. ( http://gerrit.cloudera.org:8080/12362 )
Change subject: IMPALA-8105: [DOCS] Document cache_remote_file_handles flag ...................................................................... Patch Set 4: (1 comment) One small comment, then I think this is good to go. http://gerrit.cloudera.org:8080/#/c/12362/4/docs/topics/impala_scalability.xml File docs/topics/impala_scalability.xml: http://gerrit.cloudera.org:8080/#/c/12362/4/docs/topics/impala_scalability.xml@924 PS4, Line 924: In Impala 3.2 and higher, you can also cache remote HDFS files handles. : To prevent your NameNode from overloaded when your cluster has many : remote reads, use the default setting of remote file handle caching to : be <codeph>true</codeph>. You can disable remote file handle caching : with the <codeph>cache_remote_file_handles</codeph> flag for an : <codeph>impalad</codeph>. Small rearrangement: In Impala 3.2 and higher, file handle caching also applies to remote HDFS file handles. This is controlled by the <codeph>cache_remote_file_handles</codeph> flag for an <codeph>impalad</codeph>. It is recommend to use the default value of true, as this caching prevents your NameNode from overloading when your cluster has many remote HDFS reads. -- To view, visit http://gerrit.cloudera.org:8080/12362 To unsubscribe, visit http://gerrit.cloudera.org:8080/settings Gerrit-Project: Impala-ASF Gerrit-Branch: master Gerrit-MessageType: comment Gerrit-Change-Id: Id649e733324f55a80a0199302dfa3b627ad183cf Gerrit-Change-Number: 12362 Gerrit-PatchSet: 4 Gerrit-Owner: Alex Rodoni <arod...@cloudera.com> Gerrit-Reviewer: Alex Rodoni <arod...@cloudera.com> Gerrit-Reviewer: Impala Public Jenkins <impala-public-jenk...@cloudera.com> Gerrit-Reviewer: Joe McDonnell <joemcdonn...@cloudera.com> Gerrit-Reviewer: Philip Zeyliger <phi...@cloudera.com> Gerrit-Comment-Date: Fri, 08 Feb 2019 01:57:00 +0000 Gerrit-HasComments: Yes
