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https://issues.apache.org/jira/browse/FLINK-25559?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Zongwen Li updated FLINK-25559:
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Attachment: image-2022-01-07-11-27-01-010.png
> SQL JOIN causes data loss
> -------------------------
>
> Key: FLINK-25559
> URL: https://issues.apache.org/jira/browse/FLINK-25559
> Project: Flink
> Issue Type: Bug
> Components: Table SQL / API
> Affects Versions: 1.14.0, 1.13.2, 1.13.3, 1.13.5, 1.14.2
> Reporter: Zongwen Li
> Priority: Major
> Attachments: image-2022-01-07-11-27-01-010.png
>
>
> {code:java}
> // sql omits some selected fields
> INSERT INTO kd_product_info
> SELECT
> ps.product AS productId,
> ps.productsaleid AS productSaleId,
> CAST(p.complex AS INT) AS complex,
> p.createtime AS createTime,
> p.updatetime AS updateTime,
> p.ean AS ean,
> ts.availablequantity AS totalAvailableStock,
> IF
> (
> ts.availablequantity - ts.lockoccupy - ts.lock_available_quantity > 0,
> ts.availablequantity - ts.lockoccupy - ts.lock_available_quantity,
> 0
> ) AS sharedStock
> ,rps.purchase AS purchase
> ,v.`name` AS vendorName
> FROM
> product_sale ps
> JOIN product p ON ps.product = p.id
> LEFT JOIN rate_product_sale rps ON ps.productsaleid = rps.id
> LEFT JOIN pss_total_stock ts ON ps.productsaleid = ts.productsale
> LEFT JOIN vendor v ON ps.merchant_id = v.merchant_id AND ps.vendor = v.vendor
> LEFT JOIN mccategory mc ON ps.merchant_id = mc.merchant_id AND p.mccategory
> = mc.id
> LEFT JOIN new_mccategory nmc ON p.mccategory = nmc.mc
> LEFT JOIN product_sale_grade_plus psgp ON ps.productsaleid = psgp.productsale
> LEFT JOIN product_sale_extend pse359 ON ps.productsaleid =
> pse359.product_sale AND pse359.meta = 359
> LEFT JOIN product_image_url piu ON ps.product = piu.product {code}
> All table sources are upsert-kafka，I have ensured that the associated columns
> are of the same type:
> {code:java}
> // No computed columns
> // Just plain physical columns
> PRIMARY KEY (xx) NOT ENFORCED
> ) WITH (
> 'connector' = 'upsert-kafka',
> 'topic' = 'XXX',
> 'sink.parallelism' = '%s',
> 'properties.bootstrap.servers' = 's',
> 'key.format' = 'json',
> 'value.format' = 'json'
> ) {code}
> the data in each table is between 5 million and 10 million, parallelism: 24;
> Not set ttl; In fact, we can notice data loss as soon as 30 minutes.
>
> We tested sinking to kudu, Kafka and ES;
> Also tested multiple versions: 1.13.2, 1.13.3, 1.13.5, 1.14.0, 1.14.2;
>
> After many tests, we found that when the left join table is more or the
> parallelism of the operator is greater, the data will be more easily lost.
>
> In addition, we also found that a job(1.14.0) lost some data after running
> for half a month with parallelism of 1, and the data is normal after
> rerunning. Guess it's the same problem;
>
>
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