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Posted to commits@druid.apache.org by "cryptoe (via GitHub)" <gi...@apache.org> on 2023/10/11 10:10:27 UTC
Re: [PR] Limit pages size to a configurable limit (druid)
cryptoe commented on code in PR #14994:
URL: https://github.com/apache/druid/pull/14994#discussion_r1354616728
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docs/multi-stage-query/reference.md:
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@@ -246,6 +246,7 @@ The following table lists the context parameters for the MSQ task engine:
| `durableShuffleStorage` | SELECT, INSERT, REPLACE <br /><br />Whether to use durable storage for shuffle mesh. To use this feature, configure the durable storage at the server level using `druid.msq.intermediate.storage.enable=true`). If these properties are not configured, any query with the context variable `durableShuffleStorage=true` fails with a configuration error. <br /><br /> | `false` |
| `faultTolerance` | SELECT, INSERT, REPLACE<br /><br /> Whether to turn on fault tolerance mode or not. Failed workers are retried based on [Limits](#limits). Cannot be used when `durableShuffleStorage` is explicitly set to false. | `false` |
| `selectDestination` | SELECT<br /><br /> Controls where the final result of the select query is written. <br />Use `taskReport`(the default) to write select results to the task report. <b> This is not scalable since task reports size explodes for large results </b> <br/>Use `durableStorage` to write results to durable storage location. <b>For large results sets, its recommended to use `durableStorage` </b>. To configure durable storage see [`this`](#durable-storage) section. | `taskRep
ort` |
+| `rowsPerPage` | SELECT<br /><br />The number of rows per page to target. The actual number of rows per page may be somewhat higher or lower than this number. In most cases, use the default.<br /> This property comes into effect only when `selectDestination` is set to `durableStorage` | 100000 |
Review Comment:
page is a concept explained here : https://druid.apache.org/docs/latest/querying/query-deep-storage/#get-query-status
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