[jira] [Commented] (HBASE-2004) Client javadoc suggestion: add code examples about obtaining historical values
[
https://issues.apache.org/jira/browse/HBASE-2004?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16373689#comment-16373689
]
Hudson commented on HBASE-2004:
---
FAILURE: Integrated in Jenkins build HBase-Trunk_matrix #4632 (See
[https://builds.apache.org/job/HBase-Trunk_matrix/4632/])
Revert "HBASE-2004 TestClientClusterStatus is flakey" Revert to fix JIRA
(stack: rev 3d2e9e2125ec29c6959c98157ad378d5c53f911d)
* (edit)
hbase-server/src/test/java/org/apache/hadoop/hbase/TestClientClusterStatus.java
HBASE-20044 TestClientClusterStatus is flakey" Revert "Revert (stack: rev
3434e99e6c728d59ba99141df3730f3e70e0059c)
* (edit)
hbase-server/src/test/java/org/apache/hadoop/hbase/TestClientClusterStatus.java
> Client javadoc suggestion: add code examples about obtaining historical
> values
> ---
>
> Key: HBASE-2004
> URL: https://issues.apache.org/jira/browse/HBASE-2004
> Project: HBase
> Issue Type: Improvement
> Components: Client
>Affects Versions: 0.20.1
>Reporter: Doug Meil
>Priority: Minor
>
> The implicit support HBase provides for versioning of values is very
> powerful, but it's not all that obvious for application programmers to use it
> to obtain the historical values.
> I would like to suggest adding some comments and sample code to the Result
> class (org.apache.hadoop.hbase.client.Result) Javadoc. I know this seems
> sort of obvious to people that regularly use HBase, but I think that for new
> folks having code examples available in Javadoc is helpful because it's "one
> stop shopping" for documentation (i.e., as opposed to looking to an external
> writeup). Arguably, this type of example could also go in the HTable class
> javadoc.
> e.g.,
> HTable table = new HTable(config, "mytable");
> Scan scan = new Scan(); // no arguments indicates will scan all rows
> scan.setMaxVersions( 5 ); // setting this to 1 only returns
> current version
> ResultScanner rs = table.getScanner(scan);
> for (Iterator i = rs.iterator(); i.hasNext(); ) {
> Result r = i.next();
> // obtains current value from 'family:column'
> byte b[] = r.getValue( Bytes.toBytes("family"), Bytes.toBytes("column")
> );
> KeyValue kv[] = r.raw();
> for (int j = 0; j < kv.length; j++) {
>
>byte bv[] = kv[j].getValue();
> // this loop returns both current and historical values
>byte bc[] = kv[j].getColumn();
>// returns 'family:column'
> }
>}
>
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[jira] [Commented] (HBASE-2004) Client javadoc suggestion: add code examples about obtaining historical values
[
https://issues.apache.org/jira/browse/HBASE-2004?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16372347#comment-16372347
]
Hudson commented on HBASE-2004:
---
FAILURE: Integrated in Jenkins build HBase-Trunk_matrix #4627 (See
[https://builds.apache.org/job/HBase-Trunk_matrix/4627/])
HBASE-20042 TestRegionServerAbort flakey (stack: rev
3f82098d4b7ae595aa6702d3fb7cc2fac682691b)
* (edit)
hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestRegionServerAbort.java
HBASE-2004 TestClientClusterStatus is flakey (stack: rev
3a3994223c5d634bdd7ef01ef7f31ff860849575)
* (edit)
hbase-server/src/test/java/org/apache/hadoop/hbase/TestClientClusterStatus.java
HBASE-20042 TestRegionServerAbort flakey; ADDENDUM, RETRY (stack: rev
13223c217ca6cb84a96f3c70b8c38ec19eca729f)
* (edit)
hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestRegionServerAbort.java
> Client javadoc suggestion: add code examples about obtaining historical
> values
> ---
>
> Key: HBASE-2004
> URL: https://issues.apache.org/jira/browse/HBASE-2004
> Project: HBase
> Issue Type: Improvement
> Components: Client
>Affects Versions: 0.20.1
>Reporter: Doug Meil
>Priority: Minor
>
> The implicit support HBase provides for versioning of values is very
> powerful, but it's not all that obvious for application programmers to use it
> to obtain the historical values.
> I would like to suggest adding some comments and sample code to the Result
> class (org.apache.hadoop.hbase.client.Result) Javadoc. I know this seems
> sort of obvious to people that regularly use HBase, but I think that for new
> folks having code examples available in Javadoc is helpful because it's "one
> stop shopping" for documentation (i.e., as opposed to looking to an external
> writeup). Arguably, this type of example could also go in the HTable class
> javadoc.
> e.g.,
> HTable table = new HTable(config, "mytable");
> Scan scan = new Scan(); // no arguments indicates will scan all rows
> scan.setMaxVersions( 5 ); // setting this to 1 only returns
> current version
> ResultScanner rs = table.getScanner(scan);
> for (Iterator i = rs.iterator(); i.hasNext(); ) {
> Result r = i.next();
> // obtains current value from 'family:column'
> byte b[] = r.getValue( Bytes.toBytes("family"), Bytes.toBytes("column")
> );
> KeyValue kv[] = r.raw();
> for (int j = 0; j < kv.length; j++) {
>
>byte bv[] = kv[j].getValue();
> // this loop returns both current and historical values
>byte bc[] = kv[j].getColumn();
>// returns 'family:column'
> }
>}
>
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