[GitHub] carbondata pull request #2945: [CARBONDATA-3123] Fixed JVM crash issue with ...

[xubo245]

Github user xubo245 commented on a diff in the pull request:

https://github.com/apache/carbondata/pull/2945#discussion_r236539095
  
--- Diff: 
store/sdk/src/main/java/org/apache/carbondata/sdk/file/CarbonReader.java ---
@@ -66,9 +63,6 @@
 this.readers = readers;
 this.index = 0;
 this.currentReader = readers.get(0);
-CarbonTaskInfo carbonTaskInfo = new CarbonTaskInfo();
--- End diff --

I tried the JIRA code in my laptop， JVM don‘'t crash...



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[GitHub] carbondata pull request #2945: [CARBONDATA-3123] Fixed JVM crash issue with ...

[ravipesala]

Github user ravipesala commented on a diff in the pull request:

https://github.com/apache/carbondata/pull/2945#discussion_r236538593
  
--- Diff: 
store/sdk/src/main/java/org/apache/carbondata/sdk/file/CarbonReader.java ---
@@ -66,9 +63,6 @@
 this.readers = readers;
 this.index = 0;
 this.currentReader = readers.get(0);
-CarbonTaskInfo carbonTaskInfo = new CarbonTaskInfo();
--- End diff --

@xubo245 Please continue conversation on Jira.


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[GitHub] carbondata pull request #2945: [CARBONDATA-3123] Fixed JVM crash issue with ...

[xubo245]

Github user xubo245 commented on a diff in the pull request:

https://github.com/apache/carbondata/pull/2945#discussion_r236538137
  
--- Diff: 
store/sdk/src/main/java/org/apache/carbondata/sdk/file/CarbonReader.java ---
@@ -66,9 +63,6 @@
 this.readers = readers;
 this.index = 0;
 this.currentReader = readers.get(0);
-CarbonTaskInfo carbonTaskInfo = new CarbonTaskInfo();
--- End diff --

so how to reproduce it？


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[GitHub] carbondata pull request #2945: [CARBONDATA-3123] Fixed JVM crash issue with ...

[asfgit]

Github user asfgit closed the pull request at:

https://github.com/apache/carbondata/pull/2945


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[GitHub] carbondata pull request #2945: [CARBONDATA-3123] Fixed JVM crash issue with ...

[kunal642]

Github user kunal642 commented on a diff in the pull request:

https://github.com/apache/carbondata/pull/2945#discussion_r236531750
  
--- Diff: 
store/sdk/src/main/java/org/apache/carbondata/sdk/file/CarbonReader.java ---
@@ -66,9 +63,6 @@
 this.readers = readers;
 this.index = 0;
 this.currentReader = readers.get(0);
-CarbonTaskInfo carbonTaskInfo = new CarbonTaskInfo();
--- End diff --

@xubo245 i have update the JIRA. Please check


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[GitHub] carbondata pull request #2945: [CARBONDATA-3123] Fixed JVM crash issue with ...

[xubo245]

Github user xubo245 commented on a diff in the pull request:

https://github.com/apache/carbondata/pull/2945#discussion_r236182445
  
--- Diff: 
store/sdk/src/main/java/org/apache/carbondata/sdk/file/CarbonReader.java ---
@@ -66,9 +63,6 @@
 this.readers = readers;
 this.index = 0;
 this.currentReader = readers.get(0);
-CarbonTaskInfo carbonTaskInfo = new CarbonTaskInfo();
--- End diff --

I also can't reproduce in local, my laptop has 8 cores and add 
```

CarbonProperties.getInstance().addProperty("enable.unsafe.in.query.processing","true");```

 But SDK is run in single machine, so how to reproduce it？ 

Can you write the error in JIRA or this PR?


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[GitHub] carbondata pull request #2945: [CARBONDATA-3123] Fixed JVM crash issue with ...

[kunal642]

Github user kunal642 commented on a diff in the pull request:

https://github.com/apache/carbondata/pull/2945#discussion_r235892400
  
--- Diff: 
store/sdk/src/main/java/org/apache/carbondata/sdk/file/CarbonReader.java ---
@@ -66,9 +63,6 @@
 this.readers = readers;
 this.index = 0;
 this.currentReader = readers.get(0);
-CarbonTaskInfo carbonTaskInfo = new CarbonTaskInfo();
--- End diff --

ok


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[GitHub] carbondata pull request #2945: [CARBONDATA-3123] Fixed JVM crash issue with ...

[kunal642]

Github user kunal642 commented on a diff in the pull request:

https://github.com/apache/carbondata/pull/2945#discussion_r235891858
  
--- Diff: 
store/sdk/src/main/java/org/apache/carbondata/sdk/file/CarbonReader.java ---
@@ -66,9 +63,6 @@
 this.readers = readers;
 this.index = 0;
 this.currentReader = readers.get(0);
-CarbonTaskInfo carbonTaskInfo = new CarbonTaskInfo();
--- End diff --

The same issue would be there in CSDK as well as this would be called 
internally.


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[GitHub] carbondata pull request #2945: [CARBONDATA-3123] Fixed JVM crash issue with ...

[xubo245]

Github user xubo245 commented on a diff in the pull request:

https://github.com/apache/carbondata/pull/2945#discussion_r235892016
  
--- Diff: 
store/sdk/src/main/java/org/apache/carbondata/sdk/file/CarbonReader.java ---
@@ -66,9 +63,6 @@
 this.readers = readers;
 this.index = 0;
 this.currentReader = readers.get(0);
-CarbonTaskInfo carbonTaskInfo = new CarbonTaskInfo();
--- End diff --

I am testing.


---

[GitHub] carbondata pull request #2945: [CARBONDATA-3123] Fixed JVM crash issue with ...

[xubo245]

Github user xubo245 commented on a diff in the pull request:

https://github.com/apache/carbondata/pull/2945#discussion_r235890834
  
--- Diff: 
store/sdk/src/main/java/org/apache/carbondata/sdk/file/CarbonReader.java ---
@@ -66,9 +63,6 @@
 this.readers = readers;
 this.index = 0;
 this.currentReader = readers.get(0);
-CarbonTaskInfo carbonTaskInfo = new CarbonTaskInfo();
--- End diff --

Whether will it affect CSDK?


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[GitHub] carbondata pull request #2945: [CARBONDATA-3123] Fixed JVM crash issue with ...

[kunal642]

GitHub user kunal642 opened a pull request:

https://github.com/apache/carbondata/pull/2945

[CARBONDATA-3123] Fixed JVM crash issue with CarbonRecordReader(SDK Reader).

**Problem:**
As CarbonReaderBuilder is executed on the main thread therefore while 
Reader creation we are setting TaskId to threadlocal. When multiple readers are 
created using the split API then the TaskID for the last initialized reader 
would be overridden and all the readers will use the same TaskID.
Due to this when one reader is reading and the other reader is freeing 
memory after its task completion the same memory block would be cleared and 
read at the same time causing SIGSEGV error.

**Solution:**
Do not set TaskID to thread local while Reader Initialization. 
ThreadLocalTaskInfo.getCarbonTaskInfo will take care of assigning new TaskID if 
not already present.

Be sure to do all of the following checklist to help us incorporate 
your contribution quickly and easily:

 - [ ] Any interfaces changed?
 
 - [ ] Any backward compatibility impacted?
 
 - [ ] Document update required?

 - [ ] Testing done
Please provide details on 
- Whether new unit test cases have been added or why no new tests 
are required?
- How it is tested? Please attach test report.
- Is it a performance related change? Please attach the performance 
test report.
- Any additional information to help reviewers in testing this 
change.
   
 - [ ] For large changes, please consider breaking it into sub-tasks under 
an umbrella JIRA. 



You can merge this pull request into a Git repository by running:

$ git pull https://github.com/kunal642/carbondata bug/CARBONDATA-3123

Alternatively you can review and apply these changes as the patch at:

https://github.com/apache/carbondata/pull/2945.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

This closes #2945


commit cce1811fa518545b6b31246efd5668048e7d24ea
Author: kunal642 
Date:   2018-11-23T05:41:44Z

[CARBONDATA-3123] Fixed JVM crash issue with CarbonRecordReader(SDK Reader).

**Problem:**
As CarbonReaderBuilder is executed on the main thread therefore while 
Reader creation we are setting TaskId to threadlocal. When multiple readers are 
created using the split API then the TaskID for the last initialized reader 
would be overridden and all the readers will use the same TaskID.
Due to this when one reader is reading and the other reader is freeing 
memory after its task completion the same memory block would be cleared and 
read at the same time causing SIGSEGV error.

**Solution:**
Do not set TaskID to thread local while Reader Initialization. 
ThreadLocalTaskInfo.getCarbonTaskInfo will take care of assigning new TaskID if 
not already present.




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