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https://issues.apache.org/jira/browse/HBASE-2481?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12860385#action_12860385
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stack commented on HBASE-2481:
------------------------------
Here is script to demo problem. It scans 99 rows in a PE table then pauses for
60 seconds. When it resumes, there is nothing else to fetch (though table has
millions of rows) and over on serverside is a USE:
{code}
$ more bin/slow_scan.rb
# To run: ./bin/hbase org.jruby.Main bin/slow_scan.rb
include Java
import org.apache.hadoop.hbase.util.Bytes
import org.apache.hadoop.hbase.HConstants
import org.apache.hadoop.hbase.client.HTable
import org.apache.hadoop.hbase.client.Scan
import org.apache.hadoop.hbase.HBaseConfiguration
import org.apache.hadoop.hbase.util.FSUtils
import org.apache.hadoop.fs.FileSystem
import java.lang.Thread
# Get configuration to use.
c = HBaseConfiguration.new()
# Set hadoop filesystem configuration using the hbase.rootdir.
# Otherwise, we'll always use localhost though the hbase.rootdir
# might be pointing at hdfs location.
c.set("fs.default.name", c.get(HConstants::HBASE_DIR))
fs = FileSystem.get(c)
# Clean mentions of table from .META.
# Scan the .META. and remove all lines that begin with tablename
t = HTable.new(c, "TestTable")
scan = Scan.new()
scanner = t.getScanner(scan)
count = 0
while (result = scanner.next())
rowid = Bytes.toString(result.getRow())
puts rowid
count = count + 1
# If count == 100, pause for 60 seconds.
if count == 100
Thread.sleep(1000 * 60)
end
end
scanner.close()
{code}
> Client is not getting UnknownScannerExceptions; they are being eaten
> --------------------------------------------------------------------
>
> Key: HBASE-2481
> URL: https://issues.apache.org/jira/browse/HBASE-2481
> Project: Hadoop HBase
> Issue Type: Bug
> Affects Versions: 0.20.4
> Reporter: stack
> Priority: Blocker
>
> This was reported by mudphone on IRC and confirmed by myself in quick test.
> If the client takes too long going back to the RS, the RS will throw an
> UnknownScannerException but it doesn't get back to the client. Instead, the
> client scan silently ends. Marking this blocker. Its actually in 0.20.4.
> Thats what I was testing. Mayhaps an RC sinker?
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