# Backups fail with exception concerning "Compressor detection" after upgrade

**URL:** <https://discuss.elastic.co/t/backups-fail-with-exception-concerning-compressor-detection-after-upgrade/68700>\
**Category:** Elasticsearch\
**Created:** [December 12, 2016, 11:05am UTC](https://discuss.elastic.co/t/backups-fail-with-exception-concerning-compressor-detection-after-upgrade/68700 "2016-12-12T11:05:01Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![edi](https://avatars.discourse-cdn.com/v4/letter/e/9de0a6/32.png) [@edi](https://discuss.elastic.co/u/edi)\
**Post date:** [December 12, 2016, 11:05am UTC](https://discuss.elastic.co/t/backups-fail-with-exception-concerning-compressor-detection-after-upgrade/68700/1 "2016-12-12T11:05:02Z")

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Hi,

I upgraded my Cluster from 1.7.5 to 2.4.2 last week.

Now my backups fail with "state" : "PARTIAL" and some indices failing to backup with

"reason" : "IndexShardSnapshotFailedException[Compressor detection can onl  
y be called on some xcontent bytes or compressed xcontent bytes]; nested: NotXCo  
ntentException[Compressor detection can only be called on some xcontent bytes or  
compressed xcontent bytes]; "

I did not find any helpful discussions on this concerning backups...

I get the same error when i delete old snapshots, though they are deleted from the snapshot list.

Any ideas?

Regards,  
edi

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<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [January 9, 2017, 11:05am UTC](https://discuss.elastic.co/t/backups-fail-with-exception-concerning-compressor-detection-after-upgrade/68700/2 "2017-01-09T11:05:05Z")

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