tzhang-fetch opened a new issue, #6750:
URL: https://github.com/apache/hudi/issues/6750
**Describe the problem you faced**
With a DeltaStreamer job that runs fine before, adding a
SqlQueryBasedTransformer that only SELECTs 1 column runs into memory issues.
`"--transformer-class",
"org.apache.hudi.utilities.transform.SqlQueryBasedTransformer",
"--hoodie-conf",
"hoodie.deltastreamer.transformer.sql=SELECT a.ATTRIBUTES FROM
<SRC> a"`
**To Reproduce**
Steps to reproduce the behavior:
1. Add SqlQueryBasedTransformer with simple SELECT statement to a
DeltaStreamer job
2. Run job
3.
4.
**Expected behavior**
Getting back one column from the job, without memory issues
**Environment Description**
* Hudi version : 0.10.1
* Spark version : 3.1.2
* Hive version : -
* Hadoop version : 3.1.2
* Storage (HDFS/S3/GCS..) : Reading from Kafka, storing in S3
* Running on Docker? (yes/no) : no
**Additional context**
Some additional screenshots and messages in this slack thread:
https://apache-hudi.slack.com/archives/C4D716NPQ/p1663698444989499
**Stacktrace**
```2022-09-19T21:45:44.212+0000: [GC (Allocation Failure) [PSYoungGen:
546303K->25113K(2446848K)] 598196K->77023K(8039424K), 0.0236729 secs] [Times:
user=0.05 sys=0.00, real=0.02 secs] │
│ 2022-09-19T21:45:44.236+0000: [GC (Allocation Failure) [PSYoungGen:
25113K->25029K(2758656K)] 77023K->76946K(8351232K), 0.0177561 secs] [Times:
user=0.02 sys=0.02, real=0.02 secs] │
│ 2022-09-19T21:45:44.254+0000: [Full GC (Allocation Failure) [PSYoungGen:
25029K->0K(2758656K)] [ParOldGen: 51917K->54295K(5592576K)]
76946K->54295K(8351232K), [Metaspace: 112463K->112463K(1155072K)], 0. │
│ 2022-09-19T21:45:44.378+0000: [GC (Allocation Failure) [PSYoungGen:
0K->0K(2720768K)] 54295K->54295K(8313344K), 0.0035697 secs] [Times: user=0.00
sys=0.00, real=0.01 secs] │
│ 2022-09-19T21:45:44.381+0000: [Full GC (Allocation Failure) [PSYoungGen:
0K->0K(2720768K)] [ParOldGen: 54295K->45261K(5592576K)]
54295K->45261K(8313344K), [Metaspace: 112463K->109953K(1155072K)], 0.1912 │
│ #
│
│ # java.lang.OutOfMemoryError: Java heap space
│
│ # -XX:OnOutOfMemoryError="kill -9 %p"
│
│ # Executing /bin/sh -c "kill -9 22"..```
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