# Shard removed from cluster - MergeException java.lang.ArrayIndexOutOfBoundsException
**URL:** https://discuss.elastic.co/t/shard-removed-from-cluster-mergeexception-java-lang-arrayindexoutofboundsexception/77765
**Category:** Elasticsearch
**Created:** [March 8, 2017, 6:32am UTC](https://discuss.elastic.co/t/shard-removed-from-cluster-mergeexception-java-lang-arrayindexoutofboundsexception/77765 "2017-03-08T06:32:47Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@Balamurali](https://discuss.elastic.co/u/Balamurali)
#### Post date: [March 8, 2017, 6:32am UTC](https://discuss.elastic.co/t/shard-removed-from-cluster-mergeexception-java-lang-arrayindexoutofboundsexception/77765/1 "2017-03-08T06:32:47Z")
Hi all,
we are using ES ( 1.3.7 version ) cluster with 4 data only nodes and 3 master only nodes ,
Heap allocated for each node is 4 GB.
The issue was one shard got removed from cluster
while checking in logs , below messages are in logs
[2017-03-07 21:36:43,764][WARN][index.merge.scheduler] [xxxxxxxx] [yyyyyyyy][0] failed to merge
java.lang.ArrayIndexOutOfBoundsException
at org.apache.lucene.codecs.compressing.LZ4.decompress(LZ4.java:132)
at org.apache.lucene.codecs.compressing.CompressionMode$4.decompress(CompressionMode.java:135)
[2017-03-07 21:36:43,788][WARN][index.engine.internal] [xxxxxxxx] [yyyyyyyy][0] failed engine [merge exception]
[2017-03-07 21:36:43,803][DEBUG][index.shard.service] [xxxxxxxx] [yyyyyyyy][0] state: [STARTED]-\>[CLOSED], reason [engine failure, message [merge exception][MergeException[java.lang.ArrayIndexOutOfBoundsException]; nested: ArrayIndexOutOfBoundsException; ]]
[2017-03-07 21:36:44,100][WARN][cluster.action.shard] [xxxxxxxx] [yyyyyyyy][0] sending failed shard for [yyyyyyyy][0], node[1Q0WIbVQQ4CK6Ksqetbp8w], [P], s[STARTED], indexUUID [_na_], **reason [engine failure, message [merge exception][MergeException[java.lang.ArrayIndexOutOfBoundsException]; nested: ArrayIndexOutOfBoundsException**; ]]
Due to this merge exception , shards got removed.
**what is reason for this merge exception ?** how to overcome these issues?
FYI: we are planning to ES upgrade to 2.x
can anyone please help us!!!!
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### Author:  [@Balamurali](https://discuss.elastic.co/u/Balamurali)
#### Post date: [March 13, 2017, 7:02am UTC](https://discuss.elastic.co/t/shard-removed-from-cluster-mergeexception-java-lang-arrayindexoutofboundsexception/77765/2 "2017-03-13T07:02:35Z")
Hi all,
any update on this?
again getting shard removal and getting same message .
[2017-03-12 23:47:52,111][WARN][cluster.action.shard] [XXXXXX] [YYYYYYYYY][0] received shard failed for [YYYYY][0], node[xxxx], s[STARTED], indexUUID [_na_], **reason [engine failure, message [merge exception][MergeException[java.lang.ArrayIndexOutOfBoundsException]; nested: ArrayIndexOutOfBoundsException; ]]**
can any one help us !
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### Author:  [@spinscale](https://discuss.elastic.co/u/spinscale)
#### Post date: [March 13, 2017, 9:20pm UTC](https://discuss.elastic.co/t/shard-removed-from-cluster-mergeexception-java-lang-arrayindexoutofboundsexception/77765/3 "2017-03-13T21:20:33Z")
Hey,
this is such an old version of Elasticsearch, that has its fair share of issues (for example checksums did not exist back then to detect corruption) - you might have hit [https://github.com/elastic/elasticsearch/issues/7238](https://github.com/elastic/elasticsearch/issues/7238) - which contains links to a few issues, that fixed potential index corruptions.
Please upgrade as soon as possible - it will save you a lot of pain in the future.
--Alex
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### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [April 10, 2017, 9:20pm UTC](https://discuss.elastic.co/t/shard-removed-from-cluster-mergeexception-java-lang-arrayindexoutofboundsexception/77765/4 "2017-04-10T21:20:54Z")
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