James Taylor created PHOENIX-4052:
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Summary: Create the correct index row mutations for out-of-order
data mutations
Key: PHOENIX-4052
URL: https://issues.apache.org/jira/browse/PHOENIX-4052
Project: Phoenix
Issue Type: Bug
Reporter: James Taylor
Out-of-order processing of data rows during index maintenance causes mutable
indexes to become out of sync with regard to the data table. Here's a simple
example to illustrate the issue:
# Assume table T(K,V) and index X(V,K).
# Upsert T(A, 1) at t10. Index updates: Put X(1,A) at t10.
# Upsert T(A, 3) at t30. Index updates: Delete X(1,A) at t29, Put X(3,A) at t30.
# Upsert T(A,2) at t20. Index updates: Delete X(1,A) at t19, Put X(2,A) at t20,
Delete X(2,A) at t29
Ideally, we'd want to remove the Delete X(1,A) at t29 since this isn't correct
in terms of timeline consistency, but we can't do that with HBase without
support for deleting/undoing Delete markers.
The above is not what is occurring. Instead, when T(A,2) comes in, the Put
X(2,A) will occur at t20, but the Delete won't occur. This causes more index
rows than data rows, essentially making it invalid.
See PHOENIX-4051 as a workaround for fixing this issue.
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