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https://issues.apache.org/jira/browse/SOLR-13813?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17040279#comment-17040279
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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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