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Post title:Hbase-coprocessor-the introduction and use of observer (trigger) for the coprocessor viewer
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1 co-processorCo-processor is divided into Viewer Observer and terminal Endpoint
1.1 Observer Observer (similar to trigger Triggerin a traditional database)
interface under 1.1.1 coprocessor
For more information, see the comments on the interface directly!!!
1.1.2 Use of Java APIsInherit the corresponding abstract class on the line, each abstract class has a different function, see the name of the understanding, do not explain 、、、
public class Testaddcolumnbaseregionobserver extends baseregionobserver{@Override public void Preput (observercontext& Lt Regioncoprocessorenvironment> E, put put, waledit edit, durability durability) throws IOException {Putuuidcolumnifmis Sing (E, put, edit, durability); } private void Putuuidcolumnifmissing (observercontext<regioncoprocessorenvironment> E, put put, waledit edit, Durability Durability) {try {if (!put.has (Bytes.tobytes ("CF1"), Bytes.tobytes ("UUID"))) {String uuid = Md5util.enc Rypt (Put.tostring ()); Put.add (Bytes.tobytes ("CF1"), Bytes.tobytes ("uuid"), Bytes.tobytes (UUID)); }} catch (Exception E1) {e1.printstacktrace (); } }}
1.1.3 into Itdog8-yting-hbase-coprocessor-observer-1.0.0.jar and uploaded to HDFs (hbase shell mode loading coprocessor to be used)bash-4.1$ Hadoop fs-put/usr/yting/hbase/coprocessor/test/itdog8-yting-hbase-coprocessor-observer-1.0.0.jar/usr/ itdog8/yting/hbase/coprocessor/test/
1.1.4 hbase Shell mode load coprocessorHBase (main):017:0> alter ' itdog8:hbase_coprocessor_test_1 ', ' coprocessor ' = ' hdfs:///usr/yting/hbase/ coprocessor/test/itdog8-yting-hbase-coprocessor-observer-1.0.0.jar| Com.itdog8.study.cloud.hbase.coprocessor.observer.testaddcolumnbaseregionobserver|1001|arg1=1,arg2=2 ' Updating All regions with the new schema ... 0/1 regions UPDATED.1/1 Regions updated. done.0 row (s) in 2.1490 seconds
1.1.5 Testhbase (Main):025:0> scan ' itdog8:hbase_coprocessor_test_1 'ROW Column+cell 0 row (s) in 0.0130 seconds
hbase (main):026:0> put ' itdog8:hbase_coprocessor_test_1 ', ' Row-zhagnsan ', ' cf1:name ', ' Zhangsan '0 row (s) in 0.0120 seconds
hbase (Main):027:0> scan ' itdog8:hbase_coprocessor_test_1 'ROW Column+cell &NBS P , &NB Sp , &NB Sp , &NB Sp row-zhagnsan and nbsp Column=cf1:name, timestamp=1438919899641, Val Ue=zhangsan &NBSP ;   , &NB Sp row-zhagnsan COLUMN=CF 1:uuid, timestamp=1438919899641, value=2a66e9ed97e9ded4c21d1ef555cfa69e , &NB Sp 1 Row (s) in 0.0110 seconds
HBase (Main):028:0>
It can be found that the hbase-coprocessor-observer (trigger) has successfully triggered and executed (or is known as a trigger habit point and easier to understand) when we put the data, he put the UUID in when there was no UUID. OK
1.1.6 hbase Shell mode uninstall coprocessoralter ' itdog8:hbase_coprocessor_test_1 ', METHOD = ' Table_att_unset ', NAME = ' coprocessor$1 '
1.2 terminal Endpoint (similar to a stored procedure in a traditional database)
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Hbase-coprocessor-the introduction and use of observer (trigger) for the observer of the Coprocessor | That Yi-Wipe smile
