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https://issues.apache.org/jira/browse/HBASE-3205?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12929748#action_12929748
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Jonathan Gray commented on HBASE-3205:
--------------------------------------
Seems fine to me. +1
> TableRecordReaderImpl.restart NPEs when first next is restarted
> ---------------------------------------------------------------
>
> Key: HBASE-3205
> URL: https://issues.apache.org/jira/browse/HBASE-3205
> Project: HBase
> Issue Type: Bug
> Affects Versions: 0.89.20100924
> Reporter: Jean-Daniel Cryans
> Assignee: Jean-Daniel Cryans
> Priority: Critical
> Fix For: 0.90.0
>
>
> We got this pretty interesting NPE out of TableRecordReaderImpl.restart on a
> job that was filtering more than 99% of the data from a very huge table with
> caching set to 10k:
> {noformat}
> 2010-11-08 13:08:22,344 DEBUG
> org.apache.hadoop.hbase.mapreduce.TableRecordReader:
> recovered from org.apache.hadoop.hbase.client.ScannerTimeoutException:
> 61521ms passed since the last invocation, timeout is currently set to 60000
> at
> org.apache.hadoop.hbase.client.HTable$ClientScanner.next(HTable.java:956)
> at
> org.apache.hadoop.hbase.mapreduce.TableRecordReaderImpl.nextKeyValue(TableRecordReaderImpl.java:132)
> at
> org.apache.hadoop.hbase.mapreduce.TableRecordReader.nextKeyValue(TableRecordReader.java:142)
> ...
> at org.apache.hadoop.mapred.Child.main(Child.java:170)
> Caused by: org.apache.hadoop.hbase.UnknownScannerException:
> org.apache.hadoop.hbase.UnknownScannerException:
> Scanner was closed (timed out?) after we renewed it. Could be caused by a
> very slow scanner or a lengthy garbage collection
> at
> org.apache.hadoop.hbase.regionserver.HRegion$RegionScanner.next(HRegion.java:2233)
> at
> org.apache.hadoop.hbase.regionserver.HRegion$RegionScanner.next(HRegion.java:2260)
> at
> org.apache.hadoop.hbase.regionserver.HRegionServer.next(HRegionServer.java:1933)
> ...
> at
> org.apache.hadoop.hbase.client.ScannerCallable.call(ScannerCallable.java:81)
> at
> org.apache.hadoop.hbase.client.ScannerCallable.call(ScannerCallable.java:37)
> at
> org.apache.hadoop.hbase.client.HConnectionManager$TableServers.getRegionServerWithRetries(HConnectionManager.java:1138)
> at
> org.apache.hadoop.hbase.client.HTable$ClientScanner.next(HTable.java:942)
> ... 8 more
> 2010-11-08 13:08:22,347 WARN org.apache.hadoop.mapred.TaskTracker: Error
> running child
> java.lang.NullPointerException
> at org.apache.hadoop.hbase.util.Bytes.toStringBinary(Bytes.java:301)
> at
> org.apache.hadoop.hbase.client.HTable$ClientScanner.<init>(HTable.java:803)
> at org.apache.hadoop.hbase.client.HTable.getScanner(HTable.java:484)
> at
> org.apache.hadoop.hbase.mapreduce.TableRecordReaderImpl.restart(TableRecordReaderImpl.java:58)
> at
> org.apache.hadoop.hbase.mapreduce.TableRecordReaderImpl.nextKeyValue(TableRecordReaderImpl.java:135)
> ...
> at org.apache.hadoop.mapred.Child.main(Child.java:170)
> 2010-11-08 13:08:22,349 INFO org.apache.hadoop.mapred.TaskRunner
> {noformat}
> This is because the last row key we saw is set to null, since we haven't seen
> any yet :)
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