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From jdcry...@apache.org
Subject [1/5] kudu git commit: TODO cleanup in TransactionManager
Date Thu, 27 Oct 2016 23:09:06 GMT
Repository: kudu
Updated Branches:
  refs/heads/master 5a46e6076 -> b333a36f1


TODO cleanup in TransactionManager

This removes a couple of TODOs that were now wrong because we now
have exactly-once retry semantics.

The first was about not having to perform the actual waiting for commit
wait on followers. With the new retry semantics this could easily mean
that upon retrying a request on a follower a client would observe the
result of the operation before it safe to do so.

The second was about not peforming the waiting for commit wait if the
RPCs deadline was expired. A client can now have a total deadline that
is higher than a specific RPC's deadline and has exactly once semantics
meaning even if the specific RPC's deadline is expired the client might
still retry within the context of the global deadline. In that case
we wouldn't want to have the client observe the operation before it
was supposed to.

Change-Id: Ib41a5a65dee29d26f0e7c72b4f2d30f1267c8cf2
Reviewed-on: http://gerrit.cloudera.org:8080/4826
Tested-by: Kudu Jenkins
Reviewed-by: Todd Lipcon <todd@apache.org>


Project: http://git-wip-us.apache.org/repos/asf/kudu/repo
Commit: http://git-wip-us.apache.org/repos/asf/kudu/commit/f2a39c62
Tree: http://git-wip-us.apache.org/repos/asf/kudu/tree/f2a39c62
Diff: http://git-wip-us.apache.org/repos/asf/kudu/diff/f2a39c62

Branch: refs/heads/master
Commit: f2a39c624abcd605d64d6301c3d5e307557c4127
Parents: 5a46e60
Author: David Alves <dralves@apache.org>
Authored: Wed Oct 12 16:15:02 2016 -0700
Committer: David Ribeiro Alves <dralves@apache.org>
Committed: Wed Oct 26 02:32:40 2016 +0000

----------------------------------------------------------------------
 src/kudu/tablet/transactions/transaction_driver.cc | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/kudu/blob/f2a39c62/src/kudu/tablet/transactions/transaction_driver.cc
----------------------------------------------------------------------
diff --git a/src/kudu/tablet/transactions/transaction_driver.cc b/src/kudu/tablet/transactions/transaction_driver.cc
index 60af908..3a10c16 100644
--- a/src/kudu/tablet/transactions/transaction_driver.cc
+++ b/src/kudu/tablet/transactions/transaction_driver.cc
@@ -479,7 +479,6 @@ void TransactionDriver::ApplyTask() {
     // until now.earliest > prepare_latest. Only after this are the locks
     // released.
     if (mutable_state()->external_consistency_mode() == COMMIT_WAIT) {
-      // TODO: only do this on the leader side
       TRACE("APPLY: Commit Wait.");
       // If we can't commit wait and have already applied we might have consistency
       // issues if we still reply to the client that the operation was a success.
@@ -505,11 +504,8 @@ void TransactionDriver::SetResponseTimestamp(TransactionState* transaction_state
 Status TransactionDriver::CommitWait() {
   MonoTime before = MonoTime::Now();
   DCHECK(mutable_state()->external_consistency_mode() == COMMIT_WAIT);
-  // TODO: we could plumb the RPC deadline in here, and not bother commit-waiting
-  // if the deadline is already expired.
-  RETURN_NOT_OK(
-      mutable_state()->tablet_peer()->clock()->WaitUntilAfter(mutable_state()->timestamp(),
-                                                              MonoTime::Max()));
+  RETURN_NOT_OK(mutable_state()->tablet_peer()->clock()->WaitUntilAfter(
+      mutable_state()->timestamp(), MonoTime::Max()));
   mutable_state()->mutable_metrics()->commit_wait_duration_usec =
       (MonoTime::Now() - before).ToMicroseconds();
   return Status::OK();


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