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https://issues.apache.org/jira/browse/CASSANDRA-21700?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael Semb Wever updated CASSANDRA-21700:
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Fix Version/s: 7.0
> Index hints serialization rejects a count that the validation accepts
> ---------------------------------------------------------------------
>
> Key: CASSANDRA-21700
> URL: https://issues.apache.org/jira/browse/CASSANDRA-21700
> Project: Apache Cassandra
> Issue Type: Bug
> Components: Feature/2i Index
> Reporter: Michael Semb Wever
> Assignee: Michael Semb Wever
> Priority: Normal
> Fix For: 6.0, 6.0-alpha3, 7.0
>
> Attachments:
> ci_summary_thelastpickle_mck-CASSANDRA-21700-6.0_72.html,
> ci_summary_thelastpickle_mck-CASSANDRA-21700-trunk_37.html,
> results_details_thelastpickle_mck-CASSANDRA-21700-6.0_72.tar.xz,
> results_details_thelastpickle_mck-CASSANDRA-21700-trunk_37.tar.xz
>
>
> {{IndexHints.fromCQLNames}} rejects a count above the maximum:
> {code:java}
> if (included != null && included.size() > maxIncludedOrExcludedIndexCount())
> throw new InvalidRequestException(TOO_MANY_INDEXES_ERROR +
> included.size());
> {code}
> so a {{SELECT}} may name exactly {{maxIncludedOrExcludedIndexCount()}}
> included or excluded indexes. The serializer then asserted a count strictly
> below the same maximum:
> {code:java}
> assert n < maxIncludedOrExcludedIndexCount() : TOO_MANY_INDEXES_ERROR + n;
> {code}
> The two disagree at the boundary. A query that names the maximum passes
> validation on the coordinator and then throws an {{AssertionError}} when the
> read command is serialized for a replica, and the daemon runs with assertions
> enabled. An operator meets this by setting
> {{secondary_indexes_per_table_fail_threshold}} to N and naming N indexes, or
> by naming 128 indexes when that guardrail is unset.
> The patch relaxes the assertion to {{<=}}, and makes
> {{maxIncludedOrExcludedIndexCount()}} package-private so the test can read
> the same limit. The count is written with {{writeVInt32}}, so the boundary
> carries no on-the-wire risk.
> Patch:
> [mck/CASSANDRA-21700/trunk|https://github.com/thelastpickle/cassandra/tree/mck/CASSANDRA-21700/trunk]
> Provenance:
> [d29e4a67f7|https://github.com/datastax/cassandra/commit/d29e4a67f76d2c812f2a3a283910876797ff2f9c]
> by [~brandon.williams]. That commit makes the same one-character change, and
> also ignores an {{UnknownIndexException}} during deserialization so a hint
> for an index that has not yet propagated is dropped rather than failing the
> read. This patch leaves that part out, because silently dropping a hint
> changes what the query does and needs its own discussion. That commit carries
> no test; this patch adds one.
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