Hello Dan Burkert, Todd Lipcon,
I'd like you to do a code review. Please visit
to review the following change.
Change subject: master: add read-write lock to serialize operations around
master: add read-write lock to serialize operations around elections
This rigmarole began with an investigation into a test failure , which
led to a new integration test that hammers VisitTablesAndTablets() while
creating tables. That test revealed other locking issues, which brings us
to where we are now.
This patch introduces a read-write lock to serialize all master operations
so that they fall on one side or the other of a leader election. The idea
is to avoid performing operations concurrently with a reload of the master
metadata; doing so can lead to problems in Shutdown() and (very rarely,
perhaps only conceptually) to inconsistent on-disk state.
Two other things of note here:
- TableInfo's AddTask() and RemoveTask() methods now don't hold the table's
lock when adding and removing refs from the task respectively. This is
the fix for the original test failure.
- When reloading metadata, we now abort all outstanding table tasks to
avoid orphaning them.
6 files changed, 292 insertions(+), 146 deletions(-)
git pull ssh://gerrit.cloudera.org:29418/kudu refs/changes/50/3550/1
To view, visit http://gerrit.cloudera.org:8080/3550
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Gerrit-Owner: Adar Dembo <a...@cloudera.com>
Gerrit-Reviewer: Dan Burkert <d...@cloudera.com>
Gerrit-Reviewer: Todd Lipcon <t...@apache.org>