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https://issues.apache.org/jira/browse/ARROW-14581?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17438291#comment-17438291
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David Li commented on ARROW-14581:
----------------------------------

It appears to boil down to the footer being 8 bytes longer than expected on 
s390x (which is a big-endian system): 
https://github.com/apache/arrow/commit/09b79a10acc4cbd792996276c6bed7bd7ed3765b#diff-900c46995b5706697d6e4b010f610f1a1cf27d4d865afe48de0a800830ac676bR2569-R2570

> [C++] FIne-grained IPC reader tests are flaky
> ---------------------------------------------
>
>                 Key: ARROW-14581
>                 URL: https://issues.apache.org/jira/browse/ARROW-14581
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: C++
>            Reporter: David Li
>            Priority: Major
>
>  Noticed this on 
> [Travis|https://app.travis-ci.com/github/apache/arrow/jobs/546478312]:
> {noformat}
> [----------] 7 tests from TestRecordBatchFileReaderIo
> [ RUN      ] TestRecordBatchFileReaderIo.LoadAllFieldsShouldReadTheEntireBody
> /arrow/cpp/src/arrow/ipc/read_write_test.cc:2570: Failure
> Expected equality of these values:
>   read_ranges[1].length
>     Which is: 264
>   256
> [  FAILED  ] TestRecordBatchFileReaderIo.LoadAllFieldsShouldReadTheEntireBody 
> (0 ms)
> [ RUN      ] TestRecordBatchFileReaderIo.ReadSingleFieldAtTheStart
> /arrow/cpp/src/arrow/ipc/read_write_test.cc:2570: Failure
> Expected equality of these values:
>   read_ranges[1].length
>     Which is: 264
>   256
> [  FAILED  ] TestRecordBatchFileReaderIo.ReadSingleFieldAtTheStart (0 ms)
> [ RUN      ] TestRecordBatchFileReaderIo.ReadSingleFieldInTheMiddle
> /arrow/cpp/src/arrow/ipc/read_write_test.cc:2570: Failure
> Expected equality of these values:
>   read_ranges[1].length
>     Which is: 264
>   256
> [  FAILED  ] TestRecordBatchFileReaderIo.ReadSingleFieldInTheMiddle (0 ms)
> [ RUN      ] TestRecordBatchFileReaderIo.ReadSingleFieldInTheEnd
> /arrow/cpp/src/arrow/ipc/read_write_test.cc:2570: Failure
> Expected equality of these values:
>   read_ranges[1].length
>     Which is: 264
>   256
> [  FAILED  ] TestRecordBatchFileReaderIo.ReadSingleFieldInTheEnd (0 ms)
> [ RUN      ] TestRecordBatchFileReaderIo.SkipTheFieldInTheMiddle
> /arrow/cpp/src/arrow/ipc/read_write_test.cc:2570: Failure                     
>                                                                               
>                            
> Expected equality of these values:                                            
>                                                                               
>                            
>   read_ranges[1].length                                                       
>                                                                               
>                            
>     Which is: 264                                                             
>                                                                               
>                            
>   256                                                                         
>                                                                               
>                            
> [  FAILED  ] TestRecordBatchFileReaderIo.SkipTheFieldInTheMiddle (0 ms)       
>                                                                               
>                            
> [ RUN      ] TestRecordBatchFileReaderIo.ReadTwoContinousFields               
>                                                                               
>                            
> /arrow/cpp/src/arrow/ipc/read_write_test.cc:2570: Failure                     
>                                                                               
>                            
> Expected equality of these values:                                            
>                                                                               
>                            
>   read_ranges[1].length                                                       
>                                                                               
>                            
>     Which is: 264                                                             
>                                                                               
>                            
>   256                                                                         
>                                                                               
>                            
> [  FAILED  ] TestRecordBatchFileReaderIo.ReadTwoContinousFields (1 ms)        
>                                                                               
>                            
> [ RUN      ] TestRecordBatchFileReaderIo.ReadTwoContinousFieldsWithIoMerged   
>                                                                               
>                            
> /arrow/cpp/src/arrow/ipc/read_write_test.cc:2570: Failure                     
>                                                                               
>                            
> Expected equality of these values:                                            
>                                                                               
>                            
>   read_ranges[1].length                                                       
>                                                                               
>                            
>     Which is: 264                                                             
>                                                                               
>                            
>   256                                            
> [  FAILED  ] TestRecordBatchFileReaderIo.ReadTwoContinousFieldsWithIoMerged 
> (0 ms)                                                                        
>                              
> {noformat}
> This is from a PR but shouldn't be related to the PR.



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