Question

伙计们，我正在尝试向hbase添加一个区域观察者，代码如下：

public class TestAddColumnBaseRegionObserver extends BaseRegionObserver{

@Override

public void prePut(ObserverContext<RegionCoprocessorEnvironment> e, Put put, WALEdit edit, Durability durability) throws IOException {

     putUUIDColumnIfMissing(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 = put.toString(); // md5

        put.add(Bytes.toBytes("cf1"), Bytes.toBytes("uuid"), Bytes.toBytes(uuid));

}

} catch (Exception e1) {

     e1.printStackTrace();

}

}

}

所以这段代码会添加一个新列＆＃34; uuid＆＃34;如果没有＆＃34; cf1：uuid＆＃34;表中的列。

当我在hbase shell中手动添加.jar时，它会起作用，但是在执行另一种方式时：通过将hbase.coprocessor.region.classes修改为TestAddColumnBaseRegionObserver类来修改hbase-site.xml

<property>

<name>hbase.coprocessor.region.classes</name>

<value>com.hbase.hook.TestAddColumnBaseRegionObserver</value>

</property>

并重新启动hbase，登录到hbase shell时报告错误并且tred执行hbase命令

ERROR: org.apache.hadoop.hbase.PleaseHoldException: Master is initializing   at org.apache.hadoop.hbase.master.HMaster.checkInitialized(HMaster.java:2177) at org.apache.hadoop.hbase.master.HMaster.checkNamespaceManagerReady(HMaster.java:2182) at org.apache.hadoop.hbase.master.HMaster.ensureNamespaceExists(HMaster.java:2375) at org.apache.hadoop.hbase.master.HMaster.createTable(HMaster.java:1444) at org.apache.hadoop.hbase.master.MasterRpcServices.createTable(MasterRpcServices.java:422) at org.apache.hadoop.hbase.protobuf.generated.MasterProtos$MasterService$2.callBlockingMethod(MasterProtos.java:48502) at org.apache.hadoop.hbase.ipc.RpcServer.call(RpcServer.java:2114) at org.apache.hadoop.hbase.ipc.CallRunner.run(CallRunner.java:101) at org.apache.hadoop.hbase.ipc.RpcExecutor.consumerLoop(RpcExecutor.java:130) at org.apache.hadoop.hbase.ipc.RpcExecutor$1.run(RpcExecutor.java:107) at java.lang.Thread.run(Thread.java:745)

之前有没有人遇到过类似的问题？或者你知道导致这个问题的原因吗？

得到了org.apache.hadoop.hbase.PleaseHoldException：在hbase-site.xml

0 个答案: