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https://issues.apache.org/jira/browse/PHOENIX-3121?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15396492#comment-15396492
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Lars Hofhansl commented on PHOENIX-3121:
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What could happen is that the Filter for this scan is so selective that no data
is returned for a long time. In that case, the client might time out. 100 might
be by chance be OK higher numbers (but 2mb chunks or less) might time out. But
that's pure luck, with a very selective filter, even the 1st row might take too
long to be returned. I do not think that is fundamental problem.
Also, a default for caching of 100 is bad, actually. By default the HBase
client now imposes no limit (rows set to -1) on the number of rows, but only
goes chunk by default (2mb by default).
> 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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