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Test modsnap txns running during truncate #4740

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The changes in this PR expose the following bug:

  1. a snapshot transaction latches its start LSN
  2. truncate runs
  3. the snapshot transaction sees new updates in its selects since these updates have commit LSNs lower than the latched snapshot start LSN

This is a draft. Finished PR will include fix

Signed-off-by: Morgan Douglas <[email protected]>
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/silent

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Coding style check: Success ✓.
Smoke testing: Success ✓.
Cbuild submission: Success ✓.
Regression testing: 276/581 tests failed ⚠.

The first 10 failing tests are:
unionpar_maxqueue [setup failure]
pglogs_seqnum [setup failure]
autoanalyze [setup failure]
comdb2sys_queueodh_generated
comdb2sys_pagesize_generated
comdb2sys
commit_lsn_map_delete_generated
auth_twofiles_generated
auth_queueodh_generated
auth

Signed-off-by: Morgan Douglas <[email protected]>
@morgando morgando closed this Oct 8, 2024
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