[3/3] kudu git commit: Don't perform compactions when clean time has not been advanced

[dr...@apache.org]

Don't perform compactions when clean time has not been advanced

Due to KUDU-2233 we might not advance safe time, and thus clean
time, at bootstrap causing possible corruption or crashes.

This patch adds a check to make sure that clean time has been
advanced at all before performing a compaction.

This is temporary fix until we have a more strict check like the
one proposed in https://gerrit.cloudera.org/#/c/8887/.

Change-Id: Ia74abdf7d806efc4239dc9cff4a5da28621d331a
Reviewed-on: http://gerrit.cloudera.org:8080/9436
Reviewed-by: Todd Lipcon <to...@apache.org>
Tested-by: David Ribeiro Alves <da...@gmail.com>


Project: http://git-wip-us.apache.org/repos/asf/kudu/repo
Commit: http://git-wip-us.apache.org/repos/asf/kudu/commit/00815045
Tree: http://git-wip-us.apache.org/repos/asf/kudu/tree/00815045
Diff: http://git-wip-us.apache.org/repos/asf/kudu/diff/00815045

Branch: refs/heads/master
Commit: 00815045fc3295c12023fd7ae7ad220645a10c3a
Parents: 09298f3
Author: David Alves <dr...@apache.org>
Authored: Thu Feb 22 09:38:29 2018 -0800
Committer: David Ribeiro Alves <da...@gmail.com>
Committed: Fri Feb 23 23:06:45 2018 +0000

----------------------------------------------------------------------
 src/kudu/tablet/tablet.cc | 7 +++++++
 1 file changed, 7 insertions(+)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/kudu/blob/00815045/src/kudu/tablet/tablet.cc
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diff --git a/src/kudu/tablet/tablet.cc b/src/kudu/tablet/tablet.cc
index 431de32..86182ab 100644
--- a/src/kudu/tablet/tablet.cc
+++ b/src/kudu/tablet/tablet.cc
@@ -1675,6 +1675,13 @@ Status Tablet::Compact(CompactFlags flags) {
 
 void Tablet::UpdateCompactionStats(MaintenanceOpStats* stats) {
 
+  if (mvcc_.GetCleanTimestamp() == Timestamp::kInitialTimestamp) {
+    KLOG_EVERY_N_SECS(WARNING, 30) << LogPrefix() <<  "Can't schedule compaction. Clean time has "
+                                   << "not been advanced past its initial value.";
+    stats->set_runnable(false);
+    return;
+  }
+
   // TODO: use workload statistics here to find out how "hot" the tablet has
   // been in the last 5 minutes, and somehow scale the compaction quality
   // based on that, so we favor hot tablets.