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From "Yu Li (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-16183) Correct errors in example program of coprocessor in Ref Guide
Date Mon, 11 Jul 2016 08:26:11 GMT

    [ https://issues.apache.org/jira/browse/HBASE-16183?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15370365#comment-15370365
] 

Yu Li commented on HBASE-16183:
-------------------------------

Ever tried "More->Attach Files"? Or any special problem?

> Correct errors in example program of coprocessor in Ref Guide
> -------------------------------------------------------------
>
>                 Key: HBASE-16183
>                 URL: https://issues.apache.org/jira/browse/HBASE-16183
>             Project: HBase
>          Issue Type: Bug
>          Components: documentation
>            Reporter: Xiang Li
>            Assignee: Xiang Li
>            Priority: Minor
>         Attachments: HBASE-16183.patch
>
>
> 1. In Section 89.3.3
> change
> {code}
> String path = "hdfs://<namenode>:<port>/user/<hadoop-user>/coprocessor.jar";
> {code}
> into
> {code}
> Path path = new Path("hdfs://bdavm1506.svl.ibm.com:8020/user/hbase/coprocessor.jar");
> {code}
> Reason:
>   The second parameter of HTableDescriptor.addCoprocessor() is org.apache.hadoop.fs.Path,
not String.
>   See http://hbase.apache.org/devapidocs/org/apache/hadoop/hbase/HTableDescriptor.html
> 2. In Section 89.3.3
> change
> {code}
> HBaseAdmin admin = new HBaseAdmin(conf);
> {code}
> into
> {code}
> Connection connection = ConnectionFactory.createConnection(conf);
> Admin admin = connection.getAdmin();
> {code}
> Reason:
>   HBASE-12083 makes new HBaseAdmin() deprecated and the instance of Admin is supposed
to get from Connection.getAdmin()
>   Also see http://hbase.apache.org/devapidocs/org/apache/hadoop/hbase/client/HBaseAdmin.html
> 3. In section 90.1
> change
> {code}
> public void preGetOp(final ObserverContext e, final Get get, final List results)
> {code}
> into
> {code}
> public void preGetOp(final ObserverContext<RegionCoprocessorEnvironment> e, final
Get get, final List<Cell> results)
> {code}
> change
> {code}
> List kvs = new ArrayList(results.size());
> {code}
> into
> {code}
> List<Cell> kvs = new ArrayList<Cell>(results.size());
> {code}
> change
> {code}
> public RegionScanner preScannerOpen(final ObserverContext e, final Scan scan,
> {code}
> into
> {code}
> preScannerOpen(final ObserverContext<RegionCoprocessorEnvironment> e, final Scan
scan´╝î
> {code}
> change
> {code}
> public boolean postScannerNext(final ObserverContext e, final InternalScanner s, final
List results, final int limit, final boolean hasMore) throws IOException {
> {code}
> into
> {code}
> public boolean postScannerNext(final ObserverContext<RegionCoprocessorEnvironment>
e, final InternalScanner s, final List<Result> results, final int limit, final boolean
hasMore) throws IOException {
> {code}
> change
> {code}
> Iterator iterator = results.iterator();
> {code}
> into
> {code}
> Iterator<Result> iterator = results.iterator();
> {code}
> Reason:
>   Generic
> 4. In section 90.1
> change
> {code}
> preGet(e, get, kvs);
> {code}
> into
> {code}
> super.preGetOp(e, get, kvs);
> {code}
> Reason:
>   There is not a function called preGet() provided by BaseRegionObserver or its super
class/interface. I believe we need to call preGetOp() of the super class of RegionObserverExample
here.
> 5. In section 90.1
> change
> {code}
> kvs.add(KeyValueUtil.ensureKeyValue(c));
> {code}
> into
> {code}
> kvs.add(c);
> {code}
> Reason:
>   KeyValueUtil.ensureKeyValue() is deprecated.
>   See http://hbase.apache.org/devapidocs/org/apache/hadoop/hbase/KeyValueUtil.html
>   and https://issues.apache.org/jira/browse/HBASE-12079



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