# Upgrade from 1.2.1 to 1.4.2 and indices/shards corrupted
**URL:** https://discuss.elastic.co/t/upgrade-from-1-2-1-to-1-4-2-and-indices-shards-corrupted/21890
**Category:** Elasticsearch
**Created:** [January 29, 2015, 12:56am UTC](https://discuss.elastic.co/t/upgrade-from-1-2-1-to-1-4-2-and-indices-shards-corrupted/21890 "2015-01-29T00:56:11Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@Greg\_5](https://discuss.elastic.co/u/Greg_5)
#### Post date: [January 29, 2015, 12:56am UTC](https://discuss.elastic.co/t/upgrade-from-1-2-1-to-1-4-2-and-indices-shards-corrupted/21890/1 "2015-01-29T00:56:11Z")
Hello,
We upgraded from 1.2.1 to 1.4.2 and after the restart, some shards were in
UNASSIGNED state because they was corrupted.
Here is a log: [https://gist.github.com/anonymous/63a0e3f70a72bab37052](https://gist.github.com/anonymous/63a0e3f70a72bab37052) and
"Failed to start shard, message
[IndexShardGatewayRecoveryException[[events\_xxxxx][2] failed to fetch index
version after copying it over]"
To solve this, we deleted \_checksums and corrupted\* files from the data
directory.
After various node restart... some shard which were perfectly loaded
previously became suddenly "Corrupted"... The problem occured also when i
tried to increase the number of replica on an index with no replica. The
primary and the replica became UNASSIGNED for the same reason.
I tried the command to force allocation but without success: trying to
allocate a primary shard [events\_xxxx][2], which is disabled
And i can't consider to set allow\_primary="true" if i lose my data. cf doc
"might result in data loss". In which case there is no data loss ?
The cluster is now green but.. i'm afraid to restart it or to add replica
to others indices.
Any idea about this issue ?
Thank you for you help
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### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [July 6, 2017, 12:36am UTC](https://discuss.elastic.co/t/upgrade-from-1-2-1-to-1-4-2-and-indices-shards-corrupted/21890/2 "2017-07-06T00:36:02Z")