Todd Lipcon has uploaded a new change for review. http://gerrit.cloudera.org:8080/3071
Change subject: WIP: dont rewrite log on bootstrap ...................................................................... WIP: dont rewrite log on bootstrap I've been working on speeding up tablet bootstrap, and it dawned on me that I couldn't really remember why we fully rewrite the logs on every startup. The logic was something around the idea that a COMMIT message on replay may be different than the original commit message, but my intuition now is that, although this is true, it would never actually affect whether or not the message should be replayed. I'm not 100% sure of this, but on a quick test run, it seemed to be the case. This should substantially speed up log replay: we still need to read the logs, but at least we don't need to rewrite them all. It would be better gains to somehow avoid reading segments entirely, but not 100% sure how to do that in a way that doesn't introduce weird cyclic dependencies and potential races. WIP: should still rebuild log index also need to think very carefully about mutations/inserts that are into rowsets being flushed Change-Id: Ieb904afa085a668861f8bd62bb1e2526617311aa --- M src/kudu/tablet/metadata.proto M src/kudu/tablet/tablet_bootstrap.cc 2 files changed, 23 insertions(+), 144 deletions(-) git pull ssh://gerrit.cloudera.org:29418/kudu refs/changes/71/3071/1 -- To view, visit http://gerrit.cloudera.org:8080/3071 To unsubscribe, visit http://gerrit.cloudera.org:8080/settings Gerrit-MessageType: newchange Gerrit-Change-Id: Ieb904afa085a668861f8bd62bb1e2526617311aa Gerrit-PatchSet: 1 Gerrit-Project: kudu Gerrit-Branch: master Gerrit-Owner: Todd Lipcon <[email protected]>
