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https://issues.apache.org/jira/browse/PHOENIX-3188?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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James Taylor updated PHOENIX-3188:
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Attachment: PHOENIX-3188_hack.patch
Moves ScanningResultIterator into hbase package so it can access protected
member variables.
> Making renew leases of scanners more resilient
> ----------------------------------------------
>
> Key: PHOENIX-3188
> URL: https://issues.apache.org/jira/browse/PHOENIX-3188
> Project: Phoenix
> Issue Type: Improvement
> Reporter: Samarth Jain
> Attachments: PHOENIX-3188_hack.patch
>
>
> For renewing scanner leases, we need to perform an RPC per lease renewal. It
> could happen that under load, these calls won't be picked up by region
> handler threads soon enough which could cause queries to fail. There are a
> couple of ways to solve this problem:
> 1) Issue renew lease calls at a higher priority. This essentially causes a
> different thread pool to be used on the region servers. One such example is
> the metadata and index updates calls we make. This would scale well unless
> these special thread pools themselves get saturated with requests.
> 2) Batch up the the renewLease rpc calls. If HBase is able to provide us
> scanner names and ids, then we can potentially renew leases for multiple
> scanners by batching them up in one rpc. This would entail changes in both
> client and server side of HBase. Client side - to expose scanner name. Server
> side - to expose renewLease call on a scanner given a scanner name/id.
> We still need to fix renewing leases for non-aggregate queries though. See
> PHOENIX-1751
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