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From "Ashu Pachauri (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-16498) NPE when Scan's stopRow is set NULL
Date Wed, 09 Nov 2016 21:25:58 GMT

    [ https://issues.apache.org/jira/browse/HBASE-16498?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15652078#comment-15652078

Ashu Pachauri commented on HBASE-16498:

As pointed out in HBASE-17031, this happens also when setting startRow to null,  and we fail
there way down in the call stack which is not an easily debuggable scenario. Adding to the
javadoc does not given anything, because almost no one sets start/stop row to null deliberately,
it mostly happens during an automated process.
Shouldn't we just do a null check whenever we construct a new scanner?

> NPE when Scan's stopRow is set NULL
> -----------------------------------
>                 Key: HBASE-16498
>                 URL: https://issues.apache.org/jira/browse/HBASE-16498
>             Project: HBase
>          Issue Type: Bug
>          Components: Client
>    Affects Versions: 2.0.0, 1.3.0, 1.4.0, 1.1.6, 1.2.3
>            Reporter: Pankaj Kumar
>            Assignee: Pankaj Kumar
>            Priority: Minor
>         Attachments: HBASE-16498-V2.patch, HBASE-16498-V3.patch, HBASE-16498.patch
> During scan operation we validate whether this is the last region of table, if not then
records will be retrieved from nextscanner. If stop row is set null then NPE will be thrown
while validating stop row with region endkey.
> {noformat}
> java.lang.NullPointerException
> 	at org.apache.hadoop.hbase.client.ClientScanner.checkScanStopRow(ClientScanner.java:217)
> 	at org.apache.hadoop.hbase.client.ClientScanner.nextScanner(ClientScanner.java:266)
> 	at org.apache.hadoop.hbase.client.ClientScanner.possiblyNextScanner(ClientScanner.java:237)
> 	at org.apache.hadoop.hbase.client.ClientScanner.loadCache(ClientScanner.java:537)
> 	at org.apache.hadoop.hbase.client.ClientScanner.nextWithSyncCache(ClientScanner.java:363)
> 	at org.apache.hadoop.hbase.client.ClientSimpleScanner.next(ClientSimpleScanner.java:50)
> 	at org.apache.hadoop.hbase.client.AbstractClientScanner.next(AbstractClientScanner.java:70)
> 	at org.apache.hadoop.hbase.client.TestAdmin2.testScanWithSplitKeysAndNullStartEndRow(TestAdmin2.java:803)
> {noformat}
> We should return empty byte array when start/end row is set NULL.

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