Fixed LeafReaders casting errors to SegmentReaders when segment repli… #1808
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The BWC test will be fixed by this PR: #1811 |
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…cation is enabled during search Signed-off-by: Navneet Verma <[email protected]>
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…cation is enabled during search (#1808) Signed-off-by: Navneet Verma <[email protected]> (cherry picked from commit 62cdbb6)
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…cation is enabled during search (#1808) Signed-off-by: Navneet Verma <[email protected]>
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…cation is enabled during search (opensearch-project#1808) Signed-off-by: Navneet Verma <[email protected]>
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…cation is enabled during search (#1808) (#1836) Signed-off-by: Navneet Verma <[email protected]> Co-authored-by: Navneet Verma <[email protected]>
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…cation is enabled during search (opensearch-project#1808) (opensearch-project#1836) Signed-off-by: Navneet Verma <[email protected]> Co-authored-by: Navneet Verma <[email protected]>
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Description
Fixed LeafReaders casting errors to SegmentReaders when segment replication is enabled during search
Root Cause
When Segment replication is enabled, then for replicas IndexReaders are opened via passing directory path, rather than using IndexWriters to Open the IndexReaders. This happens because replicas don't take write for Segment Replication. To ensure that soft deletes are applied on replicas too, seg-rep engine uses SoftDeletesDirectoryReaderWrapper(which extends the FilterDirectoryReader) to open the directory with soft deletes field. During search when the LeafReader for this directory is provided the SegmentReader gets wrapped into different readers like SoftDeletesFilterCodecReader or SoftDeletesFilterLeafReader. So in order to get SegmentReader we need unwrap the reader properly. Here, the idea is first we unwrap the Reader via FilterLeafReader and if the instance is of FilterCodecReader(base class for SoftDeletesFilterCodecReader), we need another round of unwrapping via FilterCodecReader to get SegmentReader. If we don't do this kind of unwrapping then during query we get cast exceptions on query on replicas with deletes in segment replication cases. We are using a helper function from OpenSearch Core to do the same.
Future Improvement:
Issues Resolved
#1807
Check List
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