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From "ASF GitHub Bot (Jira)" <>
Subject [jira] [Work logged] (HIVE-21052) Make sure transactions get cleaned if they are aborted before addPartitions is called
Date Fri, 02 Oct 2020 13:46:00 GMT


ASF GitHub Bot logged work on HIVE-21052:

                Author: ASF GitHub Bot
            Created on: 02/Oct/20 13:45
            Start Date: 02/Oct/20 13:45
    Worklog Time Spent: 10m 
      Work Description: deniskuzZ opened a new pull request #1548:

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     7. If possible, provide a concise example to reproduce the issue for a faster review.
   ### What changes were proposed in this pull request?
   Below changes are only with respect to branch-3.1.
   Design: taken from
   1. add a dummy row to TXN_COMPONENTS with operation type 'p' in enqueueLockWithRetry, which
will be removed in addDynamicPartition
   2. If anytime txn is aborted, this dummy entry will be block initiator to remove this txnId
from TXNS
   3. Initiator will add a row in COMPACTION_QUEUE (with type 'p') for the above aborted txn
with the state as READY_FOR_CLEANING, at a time there will be a single entry of this type
for a table in COMPACTION_QUEUE.
   4. Cleaner will directly pickup above request, and process it via new cleanAborted code
path(scan all partitions and remove aborted dirs), once successful cleaner will remove dummy
   **Cleaner Design:**
   - We are keeping cleaner single thread, and this new type of cleanup will be handled similar
to any regular cleanup
   **Aborted dirs cleanup:**
   - In p-type cleanup, cleaner will iterate over all the partitions and remove all delta/base
dirs with given aborted writeId list
   - added cleanup of aborted base/delta in the worker also
   **TXN_COMPONENTS cleanup:**
   - If successful, p-type entry will be removed from TXN_COMPONENTS during addDynamicPartitions
   - If aborted, cleaner will clean in markCleaned after successful processing of p-type cleanup
   **TXNS cleanup:**
   - No change, will be cleaned up by the initiator 
   Please clarify what changes you are proposing. The purpose of this section is to outline
the changes and how this PR fixes the issue. 
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PR. See the examples below.
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   ### Why are the changes needed?
   To fix above mentioned issue.
   Please clarify why the changes are needed. For instance,
     1. If you propose a new API, clarify the use case for a new API.
     2. If you fix a bug, you can clarify why it is a bug.
   ### Does this PR introduce _any_ user-facing change?
   Note that it means *any* user-facing change including all aspects such as the documentation
   If yes, please clarify the previous behavior and the change this PR proposes - provide
the console output, description, screenshot and/or a reproducable example to show the behavior
difference if possible.
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Hive versions or within the unreleased branches such as master.
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   ### How was this patch tested?
   unit-tests added
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descendants can verify in the future.
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to add.

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Issue Time Tracking

    Worklog Id:     (was: 493954)
    Time Spent: 0.5h  (was: 20m)

> Make sure transactions get cleaned if they are aborted before addPartitions is called
> -------------------------------------------------------------------------------------
>                 Key: HIVE-21052
>                 URL:
>             Project: Hive
>          Issue Type: Bug
>          Components: Transactions
>    Affects Versions: 3.0.0, 3.1.1
>            Reporter: Jaume M
>            Assignee: Jaume M
>            Priority: Critical
>              Labels: pull-request-available
>         Attachments: Aborted Txn w_Direct Write.pdf, HIVE-21052.1.patch, HIVE-21052.10.patch,
HIVE-21052.11.patch, HIVE-21052.12.patch, HIVE-21052.2.patch, HIVE-21052.3.patch, HIVE-21052.4.patch,
HIVE-21052.5.patch, HIVE-21052.6.patch, HIVE-21052.7.patch, HIVE-21052.8.patch, HIVE-21052.9.patch
>          Time Spent: 0.5h
>  Remaining Estimate: 0h
> If the transaction is aborted between openTxn and addPartitions and data has been written
on the table the transaction manager will think it's an empty transaction and no cleaning
will be done.
> This is currently an issue in the streaming API and in micromanaged tables. As proposed
by [~ekoifman] this can be solved by:
> * Writing an entry with a special marker to TXN_COMPONENTS at openTxn and when addPartitions
is called remove this entry from TXN_COMPONENTS and add the corresponding partition entry
> * If the cleaner finds and entry with a special marker in TXN_COMPONENTS that specifies
that a transaction was opened and it was aborted it must generate jobs for the worker for
every possible partition available.
> cc [~ewohlstadter]

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