[doc] Add read performance doc. #4336
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JingsongLi
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Oct 29, 2024
| There are many ways to improve read performance when reading Paimon data with Flink. | ||
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| ## Acceleration In Flink client | ||
| When use Flink batch job scan Paimon table, if you don't add option `scan.parallelism`, Paimon will infer the parallelism by read manifest files which take lots of time. So you can read Paimon table with the `scan.parallelism` table property. |
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I don't think that for most tables it will cause "take lots of time".
JingsongLi
reviewed
Oct 29, 2024
| When use Flink batch job scan Paimon table, if you don't add option `scan.parallelism`, Paimon will infer the parallelism by read manifest files which take lots of time. So you can read Paimon table with the `scan.parallelism` table property. | ||
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| ## Read Compact Snapshot | ||
| You can read snapshot which commitKind = Compact, Compared to read other commitKind snapshot, reading this snapshot requires fewer merge operations, resulting in higher performance. |
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It may only be faster if there is a configuration full-compact.
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Close this PR. |
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Purpose
Recently, when I read Paimon data through Flink batch job, I found that the job run time is often very long and often OOM.
Lucky, I have solved by adjust some Paimon parameters.
But in this process, I found that the Paimon lacks a doc which describes how to speed up reading.
So I initialized a doc related to reading performance, hoping to help more Paimon users, and also welcome more friends in Paimon community to supplement this doc.
Linked issue: close #xxx
Tests
API and Format
Documentation