Revisit deletion policy after release the last snapshot #28627
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A follow-up of elastic#28140 We currently revisit the index deletion policy whenever the global checkpoint has advanced enough. However, we won't be able to clean up the old commit points if they are being snapshotted. Here we prefer a simple solution over an optimal solution as we should revisit if only the last commit is being snapshotted.
bleskes
reviewed
Feb 12, 2018
| @@ -235,7 +239,7 @@ private static int indexOfKeptCommits(List<? extends IndexCommit> commits, long | |||
| */ | |||
| boolean hasUnreferencedCommits() throws IOException { | |||
| final IndexCommit lastCommit = this.lastCommit; | |||
| if (safeCommit != lastCommit) { // Race condition can happen but harmless | |||
| if (safeCommit != lastCommit && pendingSnapshots == 0) { // Race condition can happen but harmless | |||
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I don't really follow this logic? safe commit is maintained outside of the real of snapshots? shouldn't these be two different things? also, we now call this method when the translog is synced and thus potentially something changed for the safe commit. That doesn't have much todo with snapshots and the chance of them being released. Maybe we should make release commit return a boolean and use that an indication that there are commits that can be cleaned up?
dnhatn
changed the title
|
@bleskes I've updated the PR according to our discussion. Can please have another look? Thank you! |
bleskes
suggested changes
Feb 13, 2018
| @@ -178,6 +180,8 @@ synchronized void releaseCommit(final IndexCommit snapshotCommit) { | |||
| if (refCount == 0) { | |||
| snapshottedCommits.remove(releasingCommit); | |||
| } | |||
| // The commit can be clean up only if no pending snapshot and it is not the last commit. | |||
| return refCount == 0 && releasingCommit.equals(lastCommit) == false; | |||
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don't we need a similar check for the safe commit?
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Yes, it should return false if the releasing snapshot is the safe commit.
| assertThat(DirectoryReader.listCommits(store.directory()), contains(safeCommit, lastCommit)); | ||
| for (int i = 0; i < numSnapshots - 1; i++) { | ||
| snapshots.get(i).close(); | ||
| assertThat(DirectoryReader.listCommits(store.directory()), contains(safeCommit, lastCommit)); |
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I think we need to check nothing is cleaned just yet?
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I've updated the assertion.
clintongormley
added
:Distributed Indexing/Distributed
# Conflicts: # server/src/main/java/org/elasticsearch/index/engine/InternalEngine.java
dnhatn
added a commit
that referenced
this pull request
Feb 19, 2018
We currently revisit the index deletion policy whenever the global checkpoint has advanced enough. We should also revisit the deletion policy after releasing the last snapshot of a snapshotting commit. With this change, the old index commits will be cleaned up as soon as possible. Follow-up of #28140 #28140 (comment)
jasontedor
added a commit
to jasontedor/elasticsearch
that referenced
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Feb 19, 2018
* master: Enable selecting adaptive selection stats Remove leftover mention of file-based scripts Fix threading issue on listener notification (elastic#28730) Revisit deletion policy after release the last snapshot (elastic#28627) Remove unused method Track deletes only in the tombstone map instead of maintaining as copy (elastic#27868) [Docs] Correct typo in README.textile (elastic#28716) Fix AdaptiveSelectionStats serialization bug (elastic#28718) TEST: Fix InternalEngine#testAcquireIndexCommit Add note on temporary directory for Windows service Added coming annotation and breaking changes link to release notes script Remove leftover PR link for previously disabled bwc tests Separate acquiring safe commit and last commit (elastic#28271) Fix BWC issue of the translog last modified age stats
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A follow-up of #28140 (see #28140 (comment))
We currently revisit the index deletion policy whenever the global checkpoint has advanced enough. We should also revisit the deletion policy after releasing the last snapshot of a snapshotting commit. With this change, the old index commits will be cleaned up as soon as possible.