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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