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https://issues.apache.org/jira/browse/HBASE-13417?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14483009#comment-14483009
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Abhishek Singh Chouhan commented on HBASE-13417:
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[~larsgeorge] Mind me having a go at this by having a simple null check in
HTable.batchCoprocessorService and then using HConstants.EMPTY_START_ROW,
HConstants.EMPTY_END_ROW subsequently?
> batchCoprocessorService() does not handle NULL keys
> ---------------------------------------------------
>
> Key: HBASE-13417
> URL: https://issues.apache.org/jira/browse/HBASE-13417
> Project: HBase
> Issue Type: Bug
> Components: Coprocessors
> Affects Versions: 1.0.0
> Reporter: Lars George
> Priority: Minor
> Labels: noob
> Fix For: 2.0.0, 1.0.1, 1.1.0
>
>
> The JavaDoc for {{batchCoprocessorService()}} reads:
> {noformat}
> * @param startKey
> * start region selection with region containing this row. If {@code
> null}, the
> * selection will start with the first table region.
> * @param endKey
> * select regions up to and including the region containing this row.
> If {@code null},
> * selection will continue through the last table region.
> {noformat}
> Setting the call to {{null}} keys like so
> {code}
> Map<byte[], CountResponse> results = table.batchCoprocessorService(
> RowCountService.getDescriptor().findMethodByName("getRowCount"),
> request, null, null, CountResponse.getDefaultInstance());
> {code}
> yields an exception:
> {noformat}
> java.lang.NullPointerException
> at org.apache.hadoop.hbase.util.Bytes.compareTo(Bytes.java:1187)
> at
> org.apache.hadoop.hbase.client.HTable.getKeysAndRegionsInRange(HTable.java:744)
> at
> org.apache.hadoop.hbase.client.HTable.getKeysAndRegionsInRange(HTable.java:723)
> at
> org.apache.hadoop.hbase.client.HTable.batchCoprocessorService(HTable.java:1801)
> at
> org.apache.hadoop.hbase.client.HTable.batchCoprocessorService(HTable.java:1778)
> at coprocessor.EndpointBatchExample.main(EndpointBatchExample.java:60)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:606)
> at com.intellij.rt.execution.application.AppMain.main(AppMain.java:140)
> {noformat}
> This is caused by the call shipping off the keys to {{getStartKeysInRange()}}
> as-is and that method uses {{Bytes.compareTo()}} on the {{null}} keys and
> fails.
> One can work around using {{HConstants.EMPTY_START_ROW,
> HConstants.EMPTY_END_ROW}} instead, but that is not documented, nor standard
> behavior. Need to handle {{null}} keys as advertised.
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