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Posted to issues@lucene.apache.org by "Yonik Seeley (Jira)" <ji...@apache.org> on 2020/02/19 17:56:00 UTC
[jira] [Commented] (SOLR-13813) Shared storage online split support
[ https://issues.apache.org/jira/browse/SOLR-13813?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17040279#comment-17040279 ]
Yonik Seeley commented on SOLR-13813:
-------------------------------------
Attaching test in progress for live shard splitting with a failure on the leader node during the split.
It currently fails for both NRT replicas and shared storage replicas. I'm still investigating and haven't opened a new issue yet because it could be a test issue.
When it fails for NRT, it can often be a single missing document.
{code}
24745 ERROR (TEST-SharedStorageSplitTest.testLiveSplitFail-seed#[2D0A18F897BF536C]) [ ] o.a.s.s.b.SharedStorageSplitTest MISSING DOCUMENTS: {doc_5137=1}
24748 INFO (TEST-SharedStorageSplitTest.testLiveSplitFail-seed#[2D0A18F897BF536C]) [ ] o.a.s.SolrTestCaseJ4 ###Ending testLiveSplitFail
NOTE: reproduce with: ant test -Dtestcase=SharedStorageSplitTest -Dtests.method=testLiveSplitFail -Dtests.seed=2D0A18F897BF536C -Dtests.slow=true -Dtests.badapples=true -Dtests.locale=en-DM -Dtests.timezone=America/Barbados -Dtests.asserts=true -Dtests.file.encoding=UTF-8
java.lang.AssertionError: Documents are missing!
Expected :5106
Actual :5107
{code}
> Shared storage online split support
> -----------------------------------
>
> Key: SOLR-13813
> URL: https://issues.apache.org/jira/browse/SOLR-13813
> Project: Solr
> Issue Type: Sub-task
> Reporter: Yonik Seeley
> Priority: Major
> Attachments: SOLR-13813.patch
>
> Time Spent: 1h
> Remaining Estimate: 0h
>
> The strategy for online shard splitting is the same as that for normal (non SHARED shards.)
> During a split, the leader will forward updates to sub-shard leaders, those updates will be buffered by the transaction log while the split is in progress, and then the buffered updates are replayed.
> One change that was added was to push the local index to blob store after buffered updates are applied (but before it is marked as ACTIVE):
> See https://github.com/apache/lucene-solr/commit/fe17c813f5fe6773c0527f639b9e5c598b98c7d4#diff-081b7c2242d674bb175b41b6afc21663
> This issue is about adding tests and ensuring that online shard splitting (while updates are flowing) works reliably.
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