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Deleting table could cause dangling transaction #3828

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spolitov opened this issue Mar 4, 2020 · 0 comments
Closed

Deleting table could cause dangling transaction #3828

spolitov opened this issue Mar 4, 2020 · 0 comments
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area/docdb YugabyteDB core features

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spolitov commented Mar 4, 2020

Table deletion during the transaction is writing data to it could cause the transaction to hang in memory.
Because the transaction coordinator is unable to apply intents at the tablet of this table.
@spolitov spolitov added the area/docdb YugabyteDB core features label Mar 4, 2020
@spolitov spolitov self-assigned this Mar 4, 2020
spolitov added a commit that referenced this issue Mar 8, 2020
@spolitov
[#3828] Fix apply of transaction with deleted tablets
61ae8ce 
Summary:
When a tablet involved in a transaction is deleted, we could get into a
situation when the transaction cannot be fully applied.  This
transaction will stay in its transaction coordinator and prevent status
tablet Raft logs from being cleaned.

Fixed by handling such cases by pretending that the transaction was
applied to the deleted tablet.

Also improved log anchor tracking in the tablet server WebUI, and fixed
potential issues of unsafe modification of a multi-index container
by using the `modify` function with an iterator and a lambda.

Test Plan: ybd --gtest_filter QLTransactionTest.DeleteTableDuringWrite

Reviewers: bogdan, mikhail

Reviewed By: mikhail

Subscribers: ybase

Differential Revision: https://phabricator.dev.yugabyte.com/D8084
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