[jira] [Commented] (PHOENIX-3121) Queries with filter and reverse scan failing when limit is a multiple of scanner cache size

["Lars Hofhansl (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/PHOENIX-3121?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15396089#comment-15396089 ] 

Lars Hofhansl commented on PHOENIX-3121:
----------------------------------------

What "limit" are we talking about? The "LIMIT" clause? If we're using that unconditionally to set the scanner caching that's bad anyway, depending on what else we're setting up for the scanner. HBase now defaults to the 2mb chunk size and this should only be used when we know we might be scanning less than 2mb. If Phoenix changes or overrides the chunk size that'd be bad.


> 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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