John Omernik created DRILL-4284:
-----------------------------------
Summary: Complex Data Causing Index Out of Bounds with UNION Type
Key: DRILL-4284
URL: https://issues.apache.org/jira/browse/DRILL-4284
Project: Apache Drill
Issue Type: Bug
Components: Storage - JSON
Affects Versions: 1.4.0
Reporter: John Omernik
Working with complex json data and the UNION type, has shown a Index out of
Bounds error when trying to read data. Here are the posts from the Drill User
Group:
After getting some pointers on the new experimental Union type with json, I
started getting a different error related to index out of bounds, I thought I'd
post here to determine what it could be, and if a bug, I can then open a JIRA.
So first, I did:
ALTER SESSION SET `exec.errors.verbose` = true; -- So I could get full errors
ALTER SESSION SET `exec.enable_union_type` = true; -- So I could use the
experimental UNION type
Now, my first query, select * from `/data/prod/src/` gave me the errors below.
The files change, and ironically, if I select directly from any specific file
(even the ones in the error) often times the query works fine. It's going
through a directory of files that cause the error. Sometimes I Can do multiple
files, but often times, but I come to one file, and it seems to break it. The
file that breaks things doesn't look different from others, but at the same
time, I can select directly from the file, and it works... weird. Let know if
I can do anything to help troubleshoot more.
Data Notes (see example below):
- The ... represents LOTs of other fields, some simple, some complex/nested.
This data is NOT Pretty.
- The files are goofy in that each file has one top level field of "count" then
a huge array of events
- The field that is ALWAYS (as far as I've seen) is the "features" field
- This field will sometimes be an array and sometimes be an empty object. {}.
- The size of the array for the features field (when not an empty object) does
change from event to event. (My hunch is an issue there)
- This occurs even if I don't reference the features field, say I am trying to
flatten a different field at the same level as features.
Error:
Error: DATA_READ ERROR: index: 0, length: 4 (expected: range(0, 0))
File /data/prod/src/file1.json
Record 1
Line 193
Column 34
Field feature
Fragment 0:0
[Error Id: 25a2c963-86db-40e9-b5cc-2674887de2fe on node7:31010]
(java.lang.IndexOutOfBoundsException) index: 0, length: 4 (expected: range(0,
0))
io.netty.buffer.DrillBuf.checkIndexD():175
io.netty.buffer.DrillBuf.chk():197
io.netty.buffer.DrillBuf.getInt():477
org.apache.drill.exec.vector.UInt4Vector$Accessor.get():356
org.apache.drill.exec.vector.complex.ListVector$Mutator.startNewValue():305
org.apache.drill.exec.vector.complex.impl.UnionListWriter.startList():563
org.apache.drill.exec.vector.complex.impl.AbstractPromotableFieldWriter.startList():126
org.apache.drill.exec.vector.complex.impl.PromotableWriter.startList():42
org.apache.drill.exec.vector.complex.fn.JsonReader.writeData():461
org.apache.drill.exec.vector.complex.fn.JsonReader.writeData():305
org.apache.drill.exec.vector.complex.fn.JsonReader.writeData():470
org.apache.drill.exec.vector.complex.fn.JsonReader.writeData():305
org.apache.drill.exec.vector.complex.fn.JsonReader.writeDataSwitch():240
org.apache.drill.exec.vector.complex.fn.JsonReader.writeToVector():178
org.apache.drill.exec.vector.complex.fn.JsonReader.write():144
org.apache.drill.exec.store.easy.json.JSONRecordReader.next():191
org.apache.drill.exec.physical.impl.ScanBatch.next():191
org.apache.drill.exec.record.AbstractRecordBatch.next():119
org.apache.drill.exec.record.AbstractRecordBatch.next():109
org.apache.drill.exec.record.AbstractSingleRecordBatch.innerNext():51
org.apache.drill.exec.physical.impl.project.ProjectRecordBatch.innerNext():132
org.apache.drill.exec.record.AbstractRecordBatch.next():162
org.apache.drill.exec.physical.impl.BaseRootExec.next():104
org.apache.drill.exec.physical.impl.ScreenCreator$ScreenRoot.innerNext():81
org.apache.drill.exec.physical.impl.BaseRootExec.next():94
org.apache.drill.exec.work.fragment.FragmentExecutor$1.run():256
org.apache.drill.exec.work.fragment.FragmentExecutor$1.run():250
java.security.AccessController.doPrivileged():-2
javax.security.auth.Subject.doAs():422
org.apache.hadoop.security.UserGroupInformation.doAs():1595
org.apache.drill.exec.work.fragment.FragmentExecutor.run():250
org.apache.drill.common.SelfCleaningRunnable.run():38
java.util.concurrent.ThreadPoolExecutor.runWorker():1142
java.util.concurrent.ThreadPoolExecutor$Worker.run():617
java.lang.Thread.run():745 (state=,code=0)
Example Data:
{
"count": 241,
"events": [
{
...
...
...
"features": [
{
"count": 3,
"name": "feature1"
},
{
"count": 30,
"name": "feature2"
},
{
"count": 2,
"name": "feature3"
},
{
"count": 3,
"name": "feature4"
}
],
...
...
},
{
...
...
...
"features": {},
...
},
{
...
...
...
"features": [
{
"count": 3,
"name": "feature1"
},
{
"count": 30,
"name": "feature2"
},
{
"count": 2,
"name": "feature3"
}
],
...
...
}
]
}
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