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https://issues.apache.org/jira/browse/SOLR-11661?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16344487#comment-16344487
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ASF subversion and git services commented on SOLR-11661:
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Commit 3527fa5979f6d4fded58767d84ffb0988734acd2 in lucene-solr's branch
refs/heads/branch_7x from [~caomanhdat]
[ https://git-wip-us.apache.org/repos/asf?p=lucene-solr.git;h=3527fa5 ]
SOLR-11661: New HDFS collection reuses unremoved data from a deleted HDFS
collection with same name causes inconsistent view of documents
> New HDFS collection reuses unremoved data from a deleted HDFS collection with
> same name causes inconsistent view of documents
> -----------------------------------------------------------------------------------------------------------------------------
>
> Key: SOLR-11661
> URL: https://issues.apache.org/jira/browse/SOLR-11661
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Components: SolrCloud
> Reporter: Shalin Shekhar Mangar
> Priority: Major
> Fix For: master (8.0), 7.3
>
> Attachments: 11458-2-MoveReplicaHDFSTest-log.txt, SOLR-11661.patch,
> SOLR-11661.patch
>
>
> While testing SOLR-11458, [~ab] ran into an interesting failure which
> resulted in different document counts between leader and replica. The test is
> MoveReplicaHDFSTest on jira/solr-11458-2 branch.
> The failure is rare but reproducible on beasting:
> {code}
> reproduce with: ant test -Dtestcase=MoveReplicaHDFSTest
> -Dtests.method=testNormalFailedMove -Dtests.seed=161856CB543CD71C
> -Dtests.slow=true -Dtests.locale=ar-SA -Dtests.timezone=US/Michigan
> -Dtests.asserts=true -Dtests.file.encoding=ISO-8859-1
> [junit4] FAILURE 14.2s | MoveReplicaHDFSTest.testNormalFailedMove <<<
> [junit4] > Throwable #1: java.lang.AssertionError: expected:<100> but
> was:<56>
> [junit4] > at
> __randomizedtesting.SeedInfo.seed([161856CB543CD71C:31134983787E4905]:0)
> [junit4] > at
> org.apache.solr.cloud.MoveReplicaTest.testFailedMove(MoveReplicaTest.java:305)
> [junit4] > at
> org.apache.solr.cloud.MoveReplicaHDFSTest.testNormalFailedMove(MoveReplicaHDFSTest.java:69)
> {code}
> The root problem here is when the old replica is not live during deletion of
> a collection, the correspond HDFS data of that replica is not removed
> therefore when a new collection with the same name as the deleted collection
> is created, new replicas will reuse the old HDFS data. This leads to many
> problems in leader election and recovery
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