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Do not keep 5.x commits once having 6.x commits (#28188) 

Currently we keep a 5.x index commit as a safe commit until we have a
6.x safe commit. During that time, if peer-recovery happens, a primary
will send a 5.x commit in file-based sync and the recovery will even
fail as the snapshotted commit does not have sequence number tags.

This commit updates the combined deletion policy to delete legacy
commits if there are 6.x commits.

Relates #27606
Relates #28038
This commit is contained in:
Nhat Nguyen 2018-01-11 18:34:17 -05:00 committed by GitHub
parent 99f88f15c5
commit 55a14230a7
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2 changed files with 5 additions and 5 deletions
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4
server/src/main/java/org/elasticsearch/index/engine/CombinedDeletionPolicy.java
View File

@ -160,9 +160,9 @@ public final class CombinedDeletionPolicy extends IndexDeletionPolicy {
if (expectedTranslogUUID.equals(commitUserData.get(Translog.TRANSLOG_UUID_KEY)) == false) {
return i + 1;
}
// 5.x commits do not contain MAX_SEQ_NO.
// 5.x commits do not contain MAX_SEQ_NO, we should not keep it and the older commits.
if (commitUserData.containsKey(SequenceNumbers.MAX_SEQ_NO) == false) {
return i;
return Math.min(commits.size() - 1, i + 1);
}
final long maxSeqNoFromCommit = Long.parseLong(commitUserData.get(SequenceNumbers.MAX_SEQ_NO));
if (maxSeqNoFromCommit <= globalCheckpoint) {

6
server/src/test/java/org/elasticsearch/index/engine/CombinedDeletionPolicyTests.java
View File

@ -171,15 +171,15 @@ public class CombinedDeletionPolicyTests extends ESTestCase {
globalCheckpoint.set(randomLongBetween(0, maxSeqNo - 1));
indexPolicy.onCommit(Arrays.asList(legacyCommit, freshCommit));
verify(legacyCommit, times(0)).delete();
verify(legacyCommit, times(1)).delete(); // Do not keep the legacy commit once we have a new commit.
verify(freshCommit, times(0)).delete();
assertThat(translogPolicy.getMinTranslogGenerationForRecovery(), equalTo(legacyTranslogGen));
assertThat(translogPolicy.getMinTranslogGenerationForRecovery(), equalTo(safeTranslogGen));
assertThat(translogPolicy.getTranslogGenerationOfLastCommit(), equalTo(safeTranslogGen));
// Make the fresh commit safe.
globalCheckpoint.set(randomLongBetween(maxSeqNo, Long.MAX_VALUE));
indexPolicy.onCommit(Arrays.asList(legacyCommit, freshCommit));
verify(legacyCommit, times(1)).delete();
verify(legacyCommit, times(2)).delete();
verify(freshCommit, times(0)).delete();
assertThat(translogPolicy.getMinTranslogGenerationForRecovery(), equalTo(safeTranslogGen));
assertThat(translogPolicy.getTranslogGenerationOfLastCommit(), equalTo(safeTranslogGen));