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Home Page: https://www.aliyun.com/product/ots/
License: Apache License 2.0
Aliyun TableStore(原OTS) JAVA SDK
Home Page: https://www.aliyun.com/product/ots/
License: Apache License 2.0
使用BatchGetRow功能查询批量数据,查询一条不存在的数据,BatchGetRowResponse正常返回,取RowResult值的时候发现:isSuccess为true,但Row为null。
public class BatchGetRowResponse extends Response implements Jsonizable {
/**
* BatchGetRow批量操作中单行查询的结果。
* 若isSucceed为true,则代表该行查询操作成功,可以通过getRow获取单行查询的结果。
* 若isSucceed为false,则代表该行查询操作失败,可以通过getError获取失败的错误信息。
*/
public static class RowResult {}
}
private <T> void getBatchRow(Class<T> clazz, String table, List<PrimaryKey> pks) throws Exception {
//读取一行数据,设置数据表名称。
MultiRowQueryCriteria criteria = new MultiRowQueryCriteria(table);
//设置读取最新版本。
criteria.setMaxVersions(1);
// 添加主键
for(PrimaryKey pk : pks){
criteria.addRow(pk);
}
// 执行查询
BatchGetRowRequest request = new BatchGetRowRequest();
request.addMultiRowQueryCriteria(criteria);
BatchGetRowResponse response = client.batchGetRow(request);
List<RowResult> rowRsts = response.getBatchGetRowResult(table);
if (rowRsts.isEmpty()) {
return Collections.emptyList();
}
for(RowResult rowRst : rowRsts){
if(!rowRst.isSucceed()){
continue;
}
Row row = rowRst.getRow();
if(row.isEmpty()){
continue;
}
System.out.println(row);
}
}
OTSMultiDataSample.java
中演示了getRange
方法的调用,demo程序中,插入了GID=1, UID范围1-5的5条数据。
getRange
设定了GID范围从1-4,但是返回的结果是所有1-5的条目,这里demo是有些问题的,返回1-5是正常的。
但是我把查询程序改成GID范围INF_MIN-INF_MAX,UID范围设置成1-4时仍然返回所有结果,这里是不是存在一些bug?
参考该地址实现:https://help.aliyun.com/document_detail/114347.html?spm=a2c4g.11186623.6.615.17132345T3bKeQ
TimestreamMetaIterator iter1 = db.metaTable()
.filter(filter)
.identifierOnly() // 只返回identifer
.fetchAll();
System.out.print(iterator.getTotalCount()); //获取命中的时间线条数
while (iter1.hasNext()) {
System.out.print(iterator.next().toString());
}
public boolean hasNext() {
if (isBufferHasData()) {
return true;
}
byte[] token = response.getNextToken();
while (token != null) {
request.getSearchQuery().setToken(response.getNextToken());
request.getSearchQuery().setOffset(0);
fetchData(request);
if (isBufferHasData()) {
return true;
}
token = response.getNextToken();
}
return false;
}
上述实现会取出所有数据,是否需要把isBufferHasData提出公共方法出来。目前实现分页,不能用这个方法,只能自己写实现
如题所示
系统对[ErrorCode]:OTSFlowControl进行处理
Hi,
I'm working on an Android App which uses Aliyun Tablestore as database.
But problems occured.
When I place implementation ('com.aliyun.openservices:ots-public:2.2.4') in build.gradle, build and debug the App, exception thrown. Below is the stacktrace:
java.lang.NoSuchFieldError: No static field INSTANCE of type Lorg/apache/http/message/BasicLineFormatter; in class Lorg/apache/http/message/BasicLineFormatter; or its superclasses (declaration of 'org.apache.http.message.BasicLineFormatter' appears in /system/framework/org.apache.http.legacy.boot.jar)
at org.apache.http.impl.nio.codecs.DefaultHttpRequestWriterFactory.<init>(DefaultHttpRequestWriterFactory.java:52)
at org.apache.http.impl.nio.codecs.DefaultHttpRequestWriterFactory.<init>(DefaultHttpRequestWriterFactory.java:56)
at org.apache.http.impl.nio.codecs.DefaultHttpRequestWriterFactory.<clinit>(DefaultHttpRequestWriterFactory.java:46)
at org.apache.http.impl.nio.conn.ManagedNHttpClientConnectionFactory.<init>(ManagedNHttpClientConnectionFactory.java:75)
at org.apache.http.impl.nio.conn.ManagedNHttpClientConnectionFactory.<init>(ManagedNHttpClientConnectionFactory.java:83)
at org.apache.http.impl.nio.conn.ManagedNHttpClientConnectionFactory.<clinit>(ManagedNHttpClientConnectionFactory.java:64)
at org.apache.http.impl.nio.conn.PoolingNHttpClientConnectionManager$InternalConnectionFactory.<init>(PoolingNHttpClientConnectionManager.java:522)
at org.apache.http.impl.nio.conn.PoolingNHttpClientConnectionManager.<init>(PoolingNHttpClientConnectionManager.java:161)
at org.apache.http.impl.nio.conn.PoolingNHttpClientConnectionManager.<init>(PoolingNHttpClientConnectionManager.java:145)
at org.apache.http.impl.nio.conn.PoolingNHttpClientConnectionManager.<init>(PoolingNHttpClientConnectionManager.java:117)
at org.apache.http.impl.nio.conn.PoolingNHttpClientConnectionManager.<init>(PoolingNHttpClientConnectionManager.java:111)
at com.aliyun.openservices.ots.comm.AsyncServiceClient.<init>(AsyncServiceClient.java:44)
at com.aliyun.openservices.ots.OTSClient.<init>(OTSClient.java:164)
at com.aliyun.openservices.ots.OTSClient.<init>(OTSClient.java:116)
at com.aliyun.openservices.ots.OTSClient.<init>(OTSClient.java:56)
at com.anpeila.dashgomonitorapp.MainActivity.onCreate(MainActivity.java:26)
at android.app.Activity.performCreate(Activity.java:7081)
at android.app.Activity.performCreate(Activity.java:7072)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1215)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2747)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2872)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1601)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6600)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:518)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:821)
Any help? Thanks!
tablestore 5.3.0 对 protobuf-java 2.5.0 支持不好
Table Store sdk 有大概两秒钟的写入迟延。写入table后,马上读取,无数据。 请提供方案。
目前该接口无任何入参, 而且在 Client 执行大部分操作时都会回调一次.
暂时无法理解这个回调接口的应用场景..
java.lang.IllegalStateException: Request cannot be executed; I/O reactor status: STOPPED
at org.apache.http.util.Asserts.check(Asserts.java:46)
at org.apache.http.impl.nio.client.CloseableHttpAsyncClientBase.ensureRunning(CloseableHttpAsyncClientBase.java:90)
at org.apache.http.impl.nio.client.InternalHttpAsyncClient.execute(InternalHttpAsyncClient.java:123)
at org.apache.http.impl.nio.client.CloseableHttpAsyncClient.execute(CloseableHttpAsyncClient.java:68)
at com.alicloud.openservices.tablestore.core.http.AsyncServiceClient.asyncSendRequest(AsyncServiceClient.java:150)
at com.alicloud.openservices.tablestore.core.OperationLauncher.asyncInvokePost(OperationLauncher.java:152)
at com.alicloud.openservices.tablestore.core.BatchGetRowLauncher.fire(BatchGetRowLauncher.java:63)
at com.alicloud.openservices.tablestore.InternalClient.batchGetRow(InternalClient.java:586)
at com.alicloud.openservices.tablestore.SyncClient.batchGetRow(SyncClient.java:273)
怎么检查otsclient是否处于shutdown状态???
This is just a test.
在处理ERROR CODE的时候,要到API文档里面查询,而找API文档的错误码又要花很长时间,希望这些错误码能跟代码放在一起,方便查询。
另外,每个函数能将典型的抛出的错误码在注释里面说明一下,也会有利于处理。
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