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From "James Taylor (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (PHOENIX-3121) Queries with filter and reverse scan failing when limit is a multiple of scanner cache size
Date Wed, 27 Jul 2016 18:59:20 GMT

    [ https://issues.apache.org/jira/browse/PHOENIX-3121?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15396158#comment-15396158
] 

James Taylor commented on PHOENIX-3121:
---------------------------------------

[~samarthjain] - please add a sample query and explain plan in the description. Also, I believe
the query should execute serially, even if there is a filter, as the number of rows scanned
is bounded by the LIMIT clause. 

> Queries with filter and reverse scan failing when limit is a multiple of scanner cache
size
> -------------------------------------------------------------------------------------------
>
>                 Key: PHOENIX-3121
>                 URL: https://issues.apache.org/jira/browse/PHOENIX-3121
>             Project: Phoenix
>          Issue Type: Bug
>            Reporter: Samarth Jain
>            Assignee: Samarth Jain
>
> {code}
> org.apache.hadoop.hbase.UnknownScannerException: org.apache.hadoop.hbase.UnknownScannerException:
Unknown scanner '644116'. This can happen due to any of the following reasons: a) Scanner
id given is wrong, b) Scanner lease expired because of long wait between consecutive client
checkins, c) Server may be closing down, d) RegionServer restart during upgrade.
> If the issue is due to reason (b), a possible fix would be increasing the value of'hbase.client.scanner.timeout.period'
configuration.
>     at org.apache.hadoop.hbase.regionserver.HRegionServer.scan(HRegionServer.java:3228)
>     at org.apache.hadoop.hbase.protobuf.generated.ClientProtos$ClientService$2.callBlockingMethod(ClientProtos.java:32492)
>     at org.apache.hadoop.hbase.ipc.RpcServer.call(RpcServer.java:2208)
>     at org.apache.hadoop.hbase.ipc.CallRunner.run(CallRunner.java:104)
>     at org.apache.hadoop.hbase.ipc.RpcExecutor.consumerLoop(RpcExecutor.java:133)
>     at org.apache.hadoop.hbase.ipc.RpcExecutor$1.run(RpcExecutor.java:108)
>     at java.lang.Thread.run(Thread.java:745)
> {code}



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