[jira] [Resolved] (CARBONDATA-1878) JVM crash after off-heap-sort disabled

[Akash R Nilugal (Jira)]

     [ https://issues.apache.org/jira/browse/CARBONDATA-1878?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ravindra Pesala resolved CARBONDATA-1878.
-----------------------------------------
       Resolution: Fixed
    Fix Version/s: 1.3.0

> JVM crash after off-heap-sort disabled
> --------------------------------------
>
>                 Key: CARBONDATA-1878
>                 URL: https://issues.apache.org/jira/browse/CARBONDATA-1878
>             Project: CarbonData
>          Issue Type: Bug
>          Components: core
>    Affects Versions: 1.3.0
>            Reporter: xuchuanyin
>            Assignee: xuchuanyin
>             Fix For: 1.3.0
>
>          Time Spent: 2h 20m
>  Remaining Estimate: 0h
>
> # SCENARIO
> Recently I have fixed some issues in Carbondata. To perform a full test to cover all the code that has been modified by me, I performed some iteration of the whole test case. Each iteration is started with different  key configurations that will affect the flow in the code.
> After I set `enable.offheap.sort=false` (default value is true) in the configuration, running tests will always end up with JVM crash error. The error messages are shown as below:
> ```
> #
> # A fatal error has been detected by the Java Runtime Environment:
> #
> #  SIGSEGV (0xb) at pc=0x00007f346b207ff1, pid=144619, tid=0x00007f346c2fc700
> #
> # JRE version: Java(TM) SE Runtime Environment (8.0_111-b14) (build 1.8.0_111-b14)
> # Java VM: Java HotSpot(TM) 64-Bit Server VM (25.111-b14 mixed mode linux-amd64 compressed oops)
> # Problematic frame:
> # V  [libjvm.so+0xa90ff1]  Unsafe_SetNativeShort+0x51
> #
> # Failed to write core dump. Core dumps have been disabled. To enable core dumping, try "ulimit -c unlimited" before starting Java again
> #
> # An error report file with more information is saved as:
> # /home/xu/ws/carbondata/hs_err_pid144619.log
> #
> # If you would like to submit a bug report, please visit:
> #   http://bugreport.java.com/bugreport/crash.jsp
> #
> Process finished with exit code 134 (interrupted by signal 6: SIGABRT)
> ```
> # STEPS TOREPRODUCE
> The error can be easily reproduced in different ways. Here I will provide a simple way to reproduce it:
> 1. Find the test case `DateDataTypeDirectDictionaryTest`.
> 2. Add the following code in the method `beforeAll`.
> ```
> CarbonProperties.getInstance()
>     .addProperty(CarbonCommonConstants.ENABLE_OFFHEAP_SORT, "false")
> ```
> 3. Run this test case.
> 4. You will find the test failed with the above error.
> 5. Replace the code in Step2 with the following code:
> ```
> CarbonProperties.getInstance()
>     .addProperty(CarbonCommonConstants.ENABLE_OFFHEAP_SORT, "true")
> ```
> 6. Run this test case.
> 7. The test is success without error.
> # ANALYZE & RESOLVE
> I have reproduced this error and analyzed the core dump file. The final stack message in core dump looks like below:
> ```
> Thread 73303: (state = IN_VM)
>  - sun.misc.Unsafe.putShort(long, short) @bci=0 (Interpreted frame)
>  - org.apache.carbondata.core.indexstore.UnsafeMemoryDMStore.addToUnsafe(org.apache.carbondata.core.indexstore.schema.CarbonRowSchema, org.apache.carbondata.core.indexstore.row.DataMapRow, int) @bci=781, line=150 (Interpreted frame)
>  - org.apache.carbondata.core.indexstore.UnsafeMemoryDMStore.addIndexRowToUnsafe(org.apache.carbondata.core.indexstore.row.DataMapRow) @bci=59, line=99 (Interpreted frame)
>  ...
> ```
> After inspecting the code, I found there lies bug in `UnsafeMemoryDMStore line=150` while writing length to unsafe memory -- It writes with wrong base object.

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