Will Berkeley has posted comments on this change. ( http://gerrit.cloudera.org:8080/11420 )
Change subject: [docs] Add basic advice on setting block cache size ...................................................................... Patch Set 2: (5 comments) http://gerrit.cloudera.org:8080/#/c/11420/1//COMMIT_MSG Commit Message: http://gerrit.cloudera.org:8080/#/c/11420/1//COMMIT_MSG@11 PS1, Line 11: are so : workload dependent (e.g. consider a workload doing full table scans vs. : one mostly re-scanning a small rang > I was just letting you know. To the extent that it affects this patch...you (thumbsup) http://gerrit.cloudera.org:8080/#/c/11420/2//COMMIT_MSG Commit Message: http://gerrit.cloudera.org:8080/#/c/11420/2//COMMIT_MSG@10 PS2, Line 10: the performance of the block cache size > This still doesn't make sense; what is the "performance of the block cache Oops. http://gerrit.cloudera.org:8080/#/c/11420/1/docs/troubleshooting.adoc File docs/troubleshooting.adoc: http://gerrit.cloudera.org:8080/#/c/11420/1/docs/troubleshooting.adoc@557 PS1, Line 557: metrics > I was confused about whether there was some other endpoint I didn't know ab (thumbsup) http://gerrit.cloudera.org:8080/#/c/11420/1/docs/troubleshooting.adoc@602 PS1, Line 602: Kudu expected to read from cache but which weren't found in the cache. If a > Ah, I misinterpreted the above definition of `block_cache_misses_caching` a :/ That's the correct interpretation...we just expect to find every block in the cache always unless the cache is off, I think :). Maybe that would change, but phrased this way the docs are relatively future-proofed, even if the part about checking eviction vs insertion numbers becomes redundant. http://gerrit.cloudera.org:8080/#/c/11420/2/docs/troubleshooting.adoc File docs/troubleshooting.adoc: http://gerrit.cloudera.org:8080/#/c/11420/2/docs/troubleshooting.adoc@596 PS2, Line 596: on a tablet server > Doesn't the same guidance apply to the masters as well? Though I guess it's It sure does, but if you are struggling with cache performance on your masters you are in a realm of Kudu scalability where we don't know how to help you. -- To view, visit http://gerrit.cloudera.org:8080/11420 To unsubscribe, visit http://gerrit.cloudera.org:8080/settings Gerrit-Project: kudu Gerrit-Branch: master Gerrit-MessageType: comment Gerrit-Change-Id: Idc7411c38b6fcc8694509ec89c32e2fe74e6c0db Gerrit-Change-Number: 11420 Gerrit-PatchSet: 2 Gerrit-Owner: Will Berkeley <wdberke...@gmail.com> Gerrit-Reviewer: Adar Dembo <a...@cloudera.com> Gerrit-Reviewer: Alexey Serbin <aser...@cloudera.com> Gerrit-Reviewer: Andrew Wong <aw...@cloudera.com> Gerrit-Reviewer: Attila Bukor <abu...@apache.org> Gerrit-Reviewer: Kudu Jenkins Gerrit-Reviewer: Will Berkeley <wdberke...@gmail.com> Gerrit-Comment-Date: Thu, 13 Sep 2018 18:56:35 +0000 Gerrit-HasComments: Yes
