[ 
https://issues.apache.org/jira/browse/HBASE-20219?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16432494#comment-16432494
 ] 

Toshihiro Suzuki commented on HBASE-20219:
------------------------------------------

Thank you [~yuzhih...@gmail.com]. 

{quote}
Do you plan to implement the reverse scan ?
{quote}
I don't have a plan to implement seek for reverse scans in this Jira. I may 
create another Jira to do it.

{quote}
How would Phoenix utilize your current fix ?
{quote}
The current fix is just adding a server side check to avoid the unclear 
exception (the IllegalStateException). This server side check throws 
DoNotRetryIOException with a proper message if clients try to do reverse scan 
with the loadColumnFamiliesOnDemand optimization.

Thanks

> An error occurs when scanning with reversed=true and 
> loadColumnFamiliesOnDemand=true
> ------------------------------------------------------------------------------------
>
>                 Key: HBASE-20219
>                 URL: https://issues.apache.org/jira/browse/HBASE-20219
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Toshihiro Suzuki
>            Assignee: Toshihiro Suzuki
>            Priority: Major
>         Attachments: HBASE-20219-UT.patch, HBASE-20219.master.001.patch, 
> HBASE-20219.master.002.patch, HBASE-20219.master.003.patch, 
> HBASE-20219.master.004.patch
>
>
> I'm facing the following error when scanning with reversed=true and 
> loadColumnFamiliesOnDemand=true:
> {code}
> java.lang.IllegalStateException: requestSeek cannot be called on 
> ReversedKeyValueHeap
>       at 
> org.apache.hadoop.hbase.regionserver.ReversedKeyValueHeap.requestSeek(ReversedKeyValueHeap.java:66)
>       at 
> org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.joinedHeapMayHaveData(HRegion.java:6725)
>       at 
> org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.nextInternal(HRegion.java:6652)
>       at 
> org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.nextRaw(HRegion.java:6364)
>       at 
> org.apache.hadoop.hbase.regionserver.RSRpcServices.scan(RSRpcServices.java:3108)
>       at 
> org.apache.hadoop.hbase.regionserver.RSRpcServices.scan(RSRpcServices.java:3345)
>       at 
> org.apache.hadoop.hbase.shaded.protobuf.generated.ClientProtos$ClientService$2.callBlockingMethod(ClientProtos.java:41548)
>       at org.apache.hadoop.hbase.ipc.RpcServer.call(RpcServer.java:409)
>       at org.apache.hadoop.hbase.ipc.CallRunner.run(CallRunner.java:130)
>       at 
> org.apache.hadoop.hbase.ipc.RpcExecutor$Handler.run(RpcExecutor.java:324)
>       at 
> org.apache.hadoop.hbase.ipc.RpcExecutor$Handler.run(RpcExecutor.java:304)
> {code}
> I will attach a UT patch to reproduce this issue.



--
This message was sent by Atlassian JIRA
(v7.6.3#76005)

Reply via email to