semihsezer opened a new issue #13755:
URL: https://github.com/apache/airflow/issues/13755
**Apache Airflow version**: 2.0.0
**Kubernetes version:** 1.17.16
**Environment**:
- **OS** (e.g. from /etc/os-release): Ubuntu 18.4
**What happened**:
Webserver gets exception when reading logs from Elasticsearch when "host"
field in the log is not a string. Recent Filebeat template mapping creates host
as an object with "host.name", "host.os" etc.
```
[2021-01-18 23:53:27,923] {app.py:1891} ERROR - Exception on
/get_logs_with_metadata [GET]
Traceback (most recent call last):
File "/usr/local/lib/python3.7/site-packages/flask/app.py", line 2446, in
wsgi_app
response = self.full_dispatch_request()
File "/usr/local/lib/python3.7/site-packages/flask/app.py", line 1951, in
full_dispatch_request
rv = self.handle_user_exception(e)
File "/usr/local/lib/python3.7/site-packages/flask/app.py", line 1820, in
handle_user_exception
reraise(exc_type, exc_value, tb)
File "/usr/local/lib/python3.7/site-packages/flask/_compat.py", line 39,
in reraise
raise value
File "/usr/local/lib/python3.7/site-packages/flask/app.py", line 1949, in
full_dispatch_request
rv = self.dispatch_request()
File "/usr/local/lib/python3.7/site-packages/flask/app.py", line 1935, in
dispatch_request
return self.view_functions[rule.endpoint](**req.view_args)
File "/usr/local/lib/python3.7/site-packages/airflow/www/auth.py", line
34, in decorated
return func(*args, **kwargs)
File "/usr/local/lib/python3.7/site-packages/airflow/www/decorators.py",
line 60, in wrapper
return f(*args, **kwargs)
File "/usr/local/lib/python3.7/site-packages/airflow/utils/session.py",
line 65, in wrapper
return func(*args, session=session, **kwargs)
File "/usr/local/lib/python3.7/site-packages/airflow/www/views.py", line
1054, in get_logs_with_metadata
logs, metadata = task_log_reader.read_log_chunks(ti, try_number,
metadata)
File
"/usr/local/lib/python3.7/site-packages/airflow/utils/log/log_reader.py", line
58, in read_log_chunks
logs, metadatas = self.log_handler.read(ti, try_number,
metadata=metadata)
File
"/usr/local/lib/python3.7/site-packages/airflow/utils/log/file_task_handler.py",
line 217, in read
log, metadata = self._read(task_instance, try_number_element, metadata)
File
"/usr/local/lib/python3.7/site-packages/airflow/providers/elasticsearch/log/es_task_handler.py",
line 161, in _read
logs_by_host = self._group_logs_by_host(logs)
File
"/usr/local/lib/python3.7/site-packages/airflow/providers/elasticsearch/log/es_task_handler.py",
line 130, in _group_logs_by_host
grouped_logs[key].append(log)
TypeError: unhashable type: 'AttrDict'
```
**What you expected to happen**:
Airflow Webserver successfully pulls the logs, replacing host value with
default if needed.
<!-- What do you think went wrong? -->
The issue comes from this line. When "host" is a dictionary, it tries to
insert it as a key to the `grouped_logs` dictionary, which throws `unhashable
type: 'AttrDict'`.
```
def _group_logs_by_host(logs):
grouped_logs = defaultdict(list)
for log in logs:
key = getattr(log, 'host', 'default_host')
grouped_logs[key].append(log) # ---> fails when key is a dict
```
**How to reproduce it**:
I don't know how to concisely write this and make it easy to read at the
same time.
1- Configure Airflow to read logs from Elasticsearch
```
[elasticsearch]
host = http://elasticsearch_de:9200
write_stdout = True
json_format = True
```
2 - Load index template where host is an object [May need to add other
fields to this template as well].
Filebeat adds this by default (and many more fields).
```
PUT _template/filebeat-airflow
{
"order": 1,
"index_patterns": [
"filebeat-airflow-*"
],
"mappings": {
"doc": {
"properties": {
"host": {
"properties": {
"name": {
"type": "keyword",
"ignore_above": 1024
},
"id": {
"type": "keyword",
"ignore_above": 1024
},
"architecture": {
"type": "keyword",
"ignore_above": 1024
},
"ip": {
"type": "ip"
},
"mac": {
"type": "keyword",
"ignore_above": 1024
}
}
}
}
}
}
}
```
3 - Post sample log and fill in `log_id` field for a valid dag run.
```
curl -X POST -H 'Content-Type: application/json' -i
'http://localhost:9200/filebeat-airflow/_doc' --data '{"message": "test log
message", "log_id": "<fill-in-with-valid-example>", "offset": "1"}'
```
4 - Go to WebUI and try to view logs for dag_run.
**Workaround:** Remove host field completely with filebeat.
**Solution:** Do a type check if the extracted `host` field is a string, if
not use the default value.
**Solution2:** Make host field name configurable so that we can set it to be
`host.name` instead of hardcoded `'host'`.
If I have time I will submit the fix. I never submitted a commit before so I
don't know how long it will take me to prepare a proper commit for this.
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