# Raw reflection creation failed

**URL:** <https://community.dremio.com/t/raw-reflection-creation-failed/1863>\
**Category:** Uncategorized\
**Created:** [September 18, 2018, 3:14pm UTC](https://community.dremio.com/t/raw-reflection-creation-failed/1863 "2018-09-18T15:14:40Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Monika\_Goel](https://avatars.discourse-cdn.com/v4/letter/m/258eb7/32.png) [@Monika\_Goel](https://community.dremio.com/u/Monika_Goel)\
**Post date:** [September 18, 2018, 3:14pm UTC](https://community.dremio.com/t/raw-reflection-creation-failed/1863/1 "2018-09-18T15:14:40Z")

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Hi Team,

I am creating a raw reflection on a dataset by specifying partition & sort field. When I check reflection history, I see job is completed but Footprint says **“Reflection can not accelerate. 1 refresh jobs attempts failed, will reattempt”**. Can see below logs in server.log:

com.dremio.common.exceptions.UserException: **Failure while attempting to read metadata for table “\_\_accelerator”**.“5bee1764-f97a-456d-9d2a-ed4de8f1b9e4”.“9fa75a23-21c2-4291-8b12-3631618cbfea” from source.  
at com.dremio.common.exceptions.UserException$Builder.build(UserException.java:746) ~[dremio-common-2.0.5-201806021755080191-767cfb5.jar:2.0.5-201806021755080191-767cfb5]  
at com.dremio.exec.catalog.DatasetManager.createDataset(DatasetManager.java:403) [dremio-sabot-kernel-2.0.5-201806021755080191-767cfb5.jar:2.0.5-201806021755080191-767cfb5]  
at com.dremio.exec.catalog.CatalogImpl.createDataset(CatalogImpl.java:474) [dremio-sabot-kernel-2.0.5-201806021755080191-767cfb5.jar:2.0.5-201806021755080191-767cfb5]  
at com.dremio.exec.catalog.DelegatingCatalog.createDataset(DelegatingCatalog.java:152) [dremio-sabot-kernel-2.0.5-201806021755080191-767cfb5.jar:2.0.5-201806021755080191-767cfb5]  
at com.dremio.service.reflection.LoadMaterializationHandler.refreshMetadata(LoadMaterializationHandler.java:120) [dremio-services-accelerator-2.0.5-201806021755080191-767cfb5.jar:2.0.5-201806021755080191-767cfb5]  
at com.dremio.service.reflection.LoadMaterializationHandler.toResult(LoadMaterializationHandler.java:84) [dremio-services-accelerator-2.0.5-201806021755080191-767cfb5.jar:2.0.5-201806021755080191-767cfb5]  
at com.dremio.exec.planner.sql.handlers.commands.DirectWriterCommand.plan(DirectWriterCommand.java:87) [dremio-sabot-kernel-2.0.5-201806021755080191-767cfb5.jar:2.0.5-201806021755080191-767cfb5]  
at com.dremio.exec.work.foreman.AttemptManager.run(AttemptManager.java:305) [dremio-sabot-kernel-2.0.5-201806021755080191-767cfb5.jar:2.0.5-201806021755080191-767cfb5]  
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [na:1.8.0\_181]  
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0\_181]  
at java.lang.Thread.run(Thread.java:748) [na:1.8.0\_181]  
Caused by: java.lang.RuntimeException: java.io.IOException: Timeout occured during I/O request for sabot:\<\>

 ![reflection_error](https://us1.discourse-cdn.com/flex020/uploads/dremio/original/1X/15ead2e74b35f4d757991da76f8e86ef61b54ce4.png)

Tried by removing all reflections and re-creating after restarting dremio service but error still persist. Sufficient space available at ‘/var/lib/dremio/pdfs/accelerator’ (20G).

Please suggest. Thank you in advance.

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**Author:** ![anthony](https://sea2.discourse-cdn.com/flex020/user_avatar/community.dremio.com/anthony/32/670_2.png) [@anthony](https://community.dremio.com/u/anthony)\
**Post date:** [September 19, 2018, 12:17pm UTC](https://community.dremio.com/t/raw-reflection-creation-failed/1863/3 "2018-09-19T12:17:13Z")

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According to your screenshot, the raw reflection actually completed successfully. Also, the job profile you attached is for a query, not reflection. If the raw reflection creation actually did fail, can you attach that profile please?

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**Author:** ![Monika\_Goel](https://avatars.discourse-cdn.com/v4/letter/m/258eb7/32.png) [@Monika\_Goel](https://community.dremio.com/u/Monika_Goel)\
**Post date:** [September 19, 2018, 3:44pm UTC](https://community.dremio.com/t/raw-reflection-creation-failed/1863/4 "2018-09-19T15:44:18Z")

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@anthony  
Upgraded to 2.6 Community edition and able to successfully create Raw reflection.