[ https://issues.apache.org/jira/browse/HBASE-21032?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Andrey Elenskiy updated HBASE-21032: ------------------------------------ Description: I have a long row with a bunch of columns that I'm scanning with setAllowPartialResults(true). In the response I'm getting the first partial ScanResponse being around 2MB with multiple cells while all of the consequent ones being 1 cell per ScanResponse. After digging more, I found that each of those single cell ScanResponse partials are preceded by a heartbeat (zero cells). This results in two requests per cell to a regionserver. I've attached code to reproduce it on hbase version 2.1.0 (it works as expected on 2.0.0 and 2.0.1). [^App.java] I'm fairly certain it's a serverside issue as [gohbase|https://github.com/tsuna/gohbase] client is having the same issue. I have not tried to reproduce this with multi-row scan. was: I have a long row with a bunch of columns that I'm scanning with setAllowPartialResults(true). In the response I'm getting the first partial being around 2MB while all of the consequent ones being 1 column per partial. After digging more, I found that each of those single column partials are preceded by a heartbeat response (zero cells). This results in two request per column to a regionserver. I've attached code to reproduce it on hbase version 2.1.0 (it works as expected on 2.0.0 and 2.0.1). [^App.java] I'm fairly certain it's a serverside issue as [gohbase|https://github.com/tsuna/gohbase] client is having the same issue. I have not tried to reproduce this with multi-row scan. > ScanResponses contain only one cell each > ---------------------------------------- > > Key: HBASE-21032 > URL: https://issues.apache.org/jira/browse/HBASE-21032 > Project: HBase > Issue Type: Bug > Components: Scanners > Affects Versions: 2.1.0 > Environment: HBase 2.1.0 > Hadoop 2.8.4 > Java 8 > Reporter: Andrey Elenskiy > Priority: Major > Attachments: App.java > > > I have a long row with a bunch of columns that I'm scanning with > setAllowPartialResults(true). In the response I'm getting the first partial > ScanResponse being around 2MB with multiple cells while all of the consequent > ones being 1 cell per ScanResponse. After digging more, I found that each of > those single cell ScanResponse partials are preceded by a heartbeat (zero > cells). This results in two requests per cell to a regionserver. > I've attached code to reproduce it on hbase version 2.1.0 (it works as > expected on 2.0.0 and 2.0.1). > [^App.java] > I'm fairly certain it's a serverside issue as > [gohbase|https://github.com/tsuna/gohbase] client is having the same issue. I > have not tried to reproduce this with multi-row scan. -- This message was sent by Atlassian JIRA (v7.6.3#76005)