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From "Samarth Jain (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (PHOENIX-4366) Rebuilding a local index fails sometimes
Date Tue, 10 Apr 2018 03:49:00 GMT

    [ https://issues.apache.org/jira/browse/PHOENIX-4366?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16431669#comment-16431669
] 

Samarth Jain commented on PHOENIX-4366:
---------------------------------------

I was motivated by just getting hold of the column encoding related values once in preScannerOpen
and reusing it across the board (instead of having to fetch it from the scan context every
time). I made this with the assumption that every region gets it's own co-processor instance. Or
is it one instance per region server? If former, why is it problematic to store these values as
member variables since their scope should only be limited to the table region.

> Rebuilding a local index fails sometimes
> ----------------------------------------
>
>                 Key: PHOENIX-4366
>                 URL: https://issues.apache.org/jira/browse/PHOENIX-4366
>             Project: Phoenix
>          Issue Type: Bug
>    Affects Versions: 4.12.0
>            Reporter: Marcin Januszkiewicz
>            Assignee: James Taylor
>            Priority: Blocker
>             Fix For: 4.14.0
>
>         Attachments: PHOENIX-4366_v1.patch
>
>
> We have a table created in 4.12 with the new column encoding scheme and with several
local indexes. Sometimes when we issue an ALTER INDEX ... REBUILD command, it fails with the
following exception:
> {noformat}
> Error: org.apache.phoenix.exception.PhoenixIOException: org.apache.hadoop.hbase.DoNotRetryIOException:
TRACES,\x01BY01O90A6-$599a349e,1509979836322.3f
> 30c9d449ed6c60a1cda6898f766bd0.: null                                               
                                                                                         
               
>         at org.apache.phoenix.util.ServerUtil.createIOException(ServerUtil.java:96) 
                                                                                         
               
>         at org.apache.phoenix.util.ServerUtil.throwIOException(ServerUtil.java:62)  
                                                                                         
               
>         at org.apache.phoenix.coprocessor.BaseScannerRegionObserver$RegionScannerHolder.overrideDelegate(BaseScannerRegionObserver.java:255)
                                                 
>         at org.apache.phoenix.coprocessor.BaseScannerRegionObserver$RegionScannerHolder.nextRaw(BaseScannerRegionObserver.java:284)
                                                          
>         at org.apache.hadoop.hbase.regionserver.RSRpcServices.scan(RSRpcServices.java:2541)
                                                                                         
        
>         at org.apache.hadoop.hbase.protobuf.generated.ClientProtos$ClientService$2.callBlockingMethod(ClientProtos.java:33648)
                                                               
>         at org.apache.hadoop.hbase.ipc.RpcServer.call(RpcServer.java:2183)          
                                                                                         
               
>         at org.apache.hadoop.hbase.ipc.CallRunner.run(CallRunner.java:112)          
                                                                                         
               
>         at org.apache.hadoop.hbase.ipc.RpcExecutor$Handler.run(RpcExecutor.java:183)
                                                                                         
               
>         at org.apache.hadoop.hbase.ipc.RpcExecutor$Handler.run(RpcExecutor.java:163)
                                                                                         
               
> Caused by: java.lang.UnsupportedOperationException                                  
                                                                                         
               
>         at org.apache.phoenix.schema.PTable$QualifierEncodingScheme$1.decode(PTable.java:247)
                                                                                         
      
>         at org.apache.phoenix.schema.tuple.EncodedColumnQualiferCellsList.add(EncodedColumnQualiferCellsList.java:141)
                                                                       
>         at org.apache.phoenix.schema.tuple.EncodedColumnQualiferCellsList.add(EncodedColumnQualiferCellsList.java:56)
                                                                        
>         at org.apache.hadoop.hbase.regionserver.StoreScanner.next(StoreScanner.java:560)
                                                                                         
           
>         at org.apache.hadoop.hbase.regionserver.KeyValueHeap.next(KeyValueHeap.java:147)
                                                                                         
           
>         at org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.populateResult(HRegion.java:5735)
                                                                                  
>         at org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.nextInternal(HRegion.java:5891)
                                                                                    
>         at org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.nextRaw(HRegion.java:5669)
                                                                                         
>         at org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.nextRaw(HRegion.java:5654)
                                                                                         
>         at org.apache.phoenix.coprocessor.UngroupedAggregateRegionObserver.doPostScannerOpen(UngroupedAggregateRegionObserver.java:522)
                                                      
>         at org.apache.phoenix.coprocessor.BaseScannerRegionObserver$RegionScannerHolder.overrideDelegate(BaseScannerRegionObserver.java:236)
                                                 
>         ... 7 more (state=08000,code=101) 
> {noformat}
> This failure is intermittent, since usually we can run the command again and it will
succeed.



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