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https://issues.apache.org/jira/browse/HBASE-17031?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15643203#comment-15643203
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Ashish Singhi commented on HBASE-17031:
---------------------------------------

Dup of HBASE-16498 ?
[~pankaj2461]

> Scanners should check for null start and end rows
> -------------------------------------------------
>
>                 Key: HBASE-17031
>                 URL: https://issues.apache.org/jira/browse/HBASE-17031
>             Project: HBase
>          Issue Type: Bug
>          Components: Scanners
>            Reporter: Ashu Pachauri
>            Priority: Minor
>
> If a scan is passed with a null start row, it fails very deep in the call 
> stack. We should validate start and end rows for not null before launching 
> the scan.
> Here is the associated jstack:
> {code}
> java.lang.RuntimeException: java.lang.NullPointerException
>       at 
> org.apache.hadoop.hbase.client.RpcRetryingCaller.callWithoutRetries(RpcRetryingCaller.java:219)
>       at 
> org.apache.hadoop.hbase.client.ClientScanner.call(ClientScanner.java:326)
>       at 
> org.apache.hadoop.hbase.client.ClientScanner.nextScanner(ClientScanner.java:301)
>       at 
> org.apache.hadoop.hbase.client.ClientScanner.initializeScannerInConstruction(ClientScanner.java:166)
>       at 
> org.apache.hadoop.hbase.client.ClientScanner.<init>(ClientScanner.java:161)
>       at org.apache.hadoop.hbase.client.HTable.getScanner(HTable.java:798)
> Caused by: java.lang.NullPointerException
>       at org.apache.hadoop.hbase.util.Bytes.compareTo(Bytes.java:1225)
>       at 
> org.apache.hadoop.hbase.util.Bytes$ByteArrayComparator.compare(Bytes.java:158)
>       at 
> org.apache.hadoop.hbase.util.Bytes$ByteArrayComparator.compare(Bytes.java:147)
>       at 
> org.apache.hadoop.hbase.types.CopyOnWriteArrayMap$ArrayHolder.find(CopyOnWriteArrayMap.java:892)
>       at 
> org.apache.hadoop.hbase.types.CopyOnWriteArrayMap.floorEntry(CopyOnWriteArrayMap.java:169)
>       at 
> org.apache.hadoop.hbase.client.MetaCache.getCachedLocation(MetaCache.java:79)
>       at 
> org.apache.hadoop.hbase.client.ConnectionManager$HConnectionImplementation.getCachedLocation(ConnectionManager.java:1391)
>       at 
> org.apache.hadoop.hbase.client.ConnectionManager$HConnectionImplementation.locateRegionInMeta(ConnectionManager.java:1231)
>       at 
> org.apache.hadoop.hbase.client.ConnectionManager$HConnectionImplementation.locateRegion(ConnectionManager.java:1183)
>       at 
> org.apache.hadoop.hbase.client.RpcRetryingCallerWithReadReplicas.getRegionLocations(RpcRetryingCallerWithReadReplicas.java:305)
>       at 
> org.apache.hadoop.hbase.client.ScannerCallableWithReplicas.call(ScannerCallableWithReplicas.java:156)
>       at 
> org.apache.hadoop.hbase.client.ScannerCallableWithReplicas.call(ScannerCallableWithReplicas.java:60)
>       at 
> org.apache.hadoop.hbase.client.RpcRetryingCaller.callWithoutRetries(RpcRetryingCaller.java:211)
>       ... 30 more
> {code}



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