# Using Debug.explain kills data nodes. (8.11.1)
**URL:** https://discuss.elastic.co/t/using-debug-explain-kills-data-nodes-8-11-1/348690
**Category:** Elasticsearch
**Tags:** painless, runtime-fields
**Created:** [December 6, 2023, 3:06am UTC](https://discuss.elastic.co/t/using-debug-explain-kills-data-nodes-8-11-1/348690 "2023-12-06T03:06:58Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@ong-ar](https://discuss.elastic.co/u/ong-ar)
#### Post date: [December 6, 2023, 3:06am UTC](https://discuss.elastic.co/t/using-debug-explain-kills-data-nodes-8-11-1/348690/1 "2023-12-06T03:06:58Z")
### Elasticsearch Version
Version: 8.11.1, Build: rpm/6f9ff581fbcde658e6f69d6ce03050f060d1fd0c/2023-11-11T10:05:59.421038163Z, JVM: 21.0.1
### Installed Plugins
### Java Version
openjdk version "21.0.1"
### OS Version
6.1.61-85.141.amzn2023.x86\_64
### Problem Description
I often use map\_script for statistics, but when I use Debug.explain, the data nodes emit the message below and all die.
If removing `Debug.explain`, it works normally.
It wasn't a problem when using version 8.6.2, but since upgrading, I'm seeing that.
I need help.
```auto
[ERROR][o.e.b.ElasticsearchUncaughtExceptionHandler] [data-03] fatal error in thread [elasticsearch[data-03][search_worker][T#14]], exiting
org.elasticsearch.painless.PainlessExplainError: null
at org.elasticsearch.painless.api.Debug.explain(Debug.java:23) ~[?:?]
at org.elasticsearch.painless.PainlessScript$Script.execute( ...:66) ~[?:?]
at org.elasticsearch.search.aggregations.metrics.ScriptedMetricAggregator$1.collect(ScriptedMetricAggregator.java:124) ~[elasticsearch-8.11.1.jar:?]
at org.elasticsearch.search.aggregations.LeafBucketCollector.collect(LeafBucketCollector.java:86) ~[elasticsearch-8.11.1.jar:?]
at org.elasticsearch.search.query.QueryPhaseCollector$CompositeLeafCollector.collect(QueryPhaseCollector.java:306) ~[elasticsearch-8.11.1.jar:?]
at org.apache.lucene.search.Weight$DefaultBulkScorer.scoreRange(Weight.java:277) ~[lucene-core-9.8.0.jar:?]
at org.apache.lucene.search.Weight$DefaultBulkScorer.score(Weight.java:236) ~[lucene-core-9.8.0.jar:?]
at org.elasticsearch.search.internal.CancellableBulkScorer.score(CancellableBulkScorer.java:45) ~[elasticsearch-8.11.1.jar:?]
at org.apache.lucene.search.BulkScorer.score(BulkScorer.java:38) ~[lucene-core-9.8.0.jar:?]
at org.elasticsearch.search.internal.ContextIndexSearcher.searchLeaf(ContextIndexSearcher.java:536) ~[elasticsearch-8.11.1.jar:?]
at org.elasticsearch.search.internal.ContextIndexSearcher.search(ContextIndexSearcher.java:460) ~[elasticsearch-8.11.1.jar:?]
at org.elasticsearch.search.internal.ContextIndexSearcher.lambda$search$4(ContextIndexSearcher.java:375) ~[elasticsearch-8.11.1.jar:?]
at java.util.concurrent.FutureTask.run(FutureTask.java:317) ~[?:?]
at org.elasticsearch.common.util.concurrent.TimedRunnable.doRun(TimedRunnable.java:33) ~[elasticsearch-8.11.1.jar:?]
at org.elasticsearch.common.util.concurrent.ThreadContext$ContextPreservingAbstractRunnable.doRun(ThreadContext.java:983) ~[elasticsearch-8.11.1.jar:?]
at org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:26) ~[elasticsearch-8.11.1.jar:?]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144) ~[?:?]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642) ~[?:?]
at java.lang.Thread.run(Thread.java:1583) ~[?:?]
```
### Steps to Reproduce
1. create index
```auto
PUT /test_index?pretty
{
"settings" : {
"number_of_shards" : 1,
"number_of_replicas" : 0
},
"mappings" : {
"properties" : {
"tags" : { "type" : "keyword" },
"updated_at" : { "type" : "date" }
}
}
}
```
1. index a document
```auto
PUT test_index/_doc/1
{
"tags": [
"opster",
"elasticsearch"
],
"date": "01-01-2020"
}
```
1. search
```auto
GET test_index/_search
{
"aggs": {
"test":{
"scripted_metric":{
"init_script": """
state.funding = new HashMap();
""",
"map_script": """
def source = params._source;
Debug.explain(source);
return;
""",
"combine_script":"""
return state;
""",
"reduce_script": """
def result = new HashMap();
return result;
"""
}
}
},
"size":0
}
```
1. check
```auto
GET test_index/_search
```
If you use `Debug.explain` in map\_script, an error message will appear, but if you search another index afterwards, the search will not work. The reason is that the data nodes are dead with the below message.
### Logs (if relevant)
- map\_script result
```auto
{
"error": {
"root_cause": [
{
"type": "script_exception",
"reason": "runtime error",
"painless_class": "java.util.LinkedHashMap",
"to_string": "{tags=[opster, elasticsearch], date=01-01-2020}",
"java_class": "java.util.LinkedHashMap",
"script_stack": [
"""Debug.explain(source);
""",
" ^---- HERE"
],
"script": " ...",
"lang": "painless",
"position": {
"offset": 65,
"start": 51,
"end": 84
}
}
],
"type": "search_phase_execution_exception",
"reason": "all shards failed",
"phase": "query",
"grouped": true,
"failed_shards": [
{
"shard": 0,
"index": "test_index",
"node": "o39edlW3TC6VvO9Iu0bH8w",
"reason": {
"type": "script_exception",
"reason": "runtime error",
"painless_class": "java.util.LinkedHashMap",
"to_string": "{tags=[opster, elasticsearch], date=01-01-2020}",
"java_class": "java.util.LinkedHashMap",
"script_stack": [
"""Debug.explain(source);
""",
" ^---- HERE"
],
"script": " ...",
"lang": "painless",
"position": {
"offset": 65,
"start": 51,
"end": 84
},
"caused_by": {
"type": "painless_explain_error",
"reason": null
}
}
}
]
},
"status": 400
}
```
- elasticsearch log
```auto
[ERROR][o.e.b.ElasticsearchUncaughtExceptionHandler] [master-1] fatal error in thread [elasticsearch[master-1][search_worker][T#5]], exiting
org.elasticsearch.painless.PainlessExplainError: null
at org.elasticsearch.painless.api.Debug.explain(Debug.java:23) ~[?:?]
at org.elasticsearch.painless.PainlessScript$Script.execute( ...:66) ~[?:?]
at org.elasticsearch.search.aggregations.metrics.ScriptedMetricAggregator$1.collect(ScriptedMetricAggregator.java:124) ~[elasticsearch-8.11.1.jar:?]
at org.elasticsearch.search.aggregations.LeafBucketCollector.collect(LeafBucketCollector.java:86) ~[elasticsearch-8.11.1.jar:?]
at org.apache.lucene.search.MatchAllDocsQuery$1$1.score(MatchAllDocsQuery.java:63) ~[lucene-core-9.8.0.jar:?]
at org.elasticsearch.search.internal.CancellableBulkScorer.score(CancellableBulkScorer.java:45) ~[elasticsearch-8.11.1.jar:?]
at org.apache.lucene.search.BulkScorer.score(BulkScorer.java:38) ~[lucene-core-9.8.0.jar:?]
at org.elasticsearch.search.internal.ContextIndexSearcher.searchLeaf(ContextIndexSearcher.java:536) ~[elasticsearch-8.11.1.jar:?]
at org.elasticsearch.search.internal.ContextIndexSearcher.search(ContextIndexSearcher.java:460) ~[elasticsearch-8.11.1.jar:?]
at org.elasticsearch.search.internal.ContextIndexSearcher.lambda$search$4(ContextIndexSearcher.java:375) ~[elasticsearch-8.11.1.jar:?]
at java.util.concurrent.FutureTask.run(FutureTask.java:317) ~[?:?]
at org.elasticsearch.common.util.concurrent.TimedRunnable.doRun(TimedRunnable.java:33) ~[elasticsearch-8.11.1.jar:?]
at org.elasticsearch.common.util.concurrent.ThreadContext$ContextPreservingAbstractRunnable.doRun(ThreadContext.java:983) ~[elasticsearch-8.11.1.jar:?]
at org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:26) ~[elasticsearch-8.11.1.jar:?]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144) ~[?:?]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642) ~[?:?]
at java.lang.Thread.run(Thread.java:1583) ~[?:?]
```
- system log
```auto
systemd-entrypoint: ERROR: Elasticsearch exited unexpectedly, with exit code 1
```
---
### Author:  [@ong-ar](https://discuss.elastic.co/u/ong-ar)
#### Post date: [December 6, 2023, 3:35am UTC](https://discuss.elastic.co/t/using-debug-explain-kills-data-nodes-8-11-1/348690/2 "2023-12-06T03:35:44Z")
I also tested it on Centos 7 and it was the same.
enviroment: 1 node (master + data)
---
### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [January 3, 2024, 3:36am UTC](https://discuss.elastic.co/t/using-debug-explain-kills-data-nodes-8-11-1/348690/3 "2024-01-03T03:36:17Z")
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