1
我想安裝豬的單元測試,我正在查看他們提供的文檔。這似乎有點過時,所以我切換到svn主幹。第一個奇怪的是,實際上它需要更多的庫,不僅需要pigunit,pig和hadoop-commons才能工作(添加hadoop-hdfs,hadoop-mapreduce-client-core,hadoop-mapreduce-client-jobclient)。我不確定在依賴管理器中有這些東西是否合適,但這不是主要問題。因此,這裏是我試圖執行測試:運行pigunit樣本測試的奇怪錯誤
@Test
public void testNtoN() throws ParseException, IOException {
String[] args = {
"n=3",
"reducers=1",
"input=top_queries_input_data.txt",
"output=top_3_queries",
};
test = new PigTest("script dir", args);
String[] output = {
"(yahoo,25)",
"(facebook,15)",
"(twitter,7)",
};
test.assertOutput("queries_limit", output);
}
,這裏是實際的腳本:
data =
LOAD '$input'
AS (query:CHARARRAY, count:INT);
queries_group =
GROUP data
BY query
PARALLEL $reducers;
queries_sum =
FOREACH queries_group
GENERATE
group AS query,
SUM(data.count) AS count;
queries_ordered =
ORDER queries_sum
BY count DESC
PARALLEL $reducers;
queries_limit = LIMIT queries_ordered $n;
STORE queries_limit INTO '$output';
這裏的堆棧跟蹤:
STORE queries_limit INTO 'top_3_queries';
--> none
org.apache.pig.impl.logicalLayer.FrontendException: ERROR 1066: Unable to open iterator for alias queries_limit
at org.apache.pig.PigServer.openIterator(PigServer.java:1019)
at org.apache.pig.pigunit.PigTest.getAliasFromCache(PigTest.java:224)
at org.apache.pig.pigunit.PigTest.getActualResults(PigTest.java:319)
at org.apache.pig.pigunit.PigTest.assertOutput(PigTest.java:409)
at org.apache.pig.pigunit.PigTest.assertOutput(PigTest.java:400)
at BlaUnitTest.testBla(BlaUnitTest.java:24)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
at org.mockito.internal.runners.JUnit45AndHigherRunnerImpl.run(JUnit45AndHigherRunnerImpl.java:37)
at org.mockito.runners.MockitoJUnitRunner.run(MockitoJUnitRunner.java:62)
at org.junit.runner.JUnitCore.run(JUnitCore.java:160)
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:117)
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:42)
at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:262)
at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:84)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:147)
Caused by: java.io.IOException: Couldn't retrieve job.
at org.apache.pig.PigServer.store(PigServer.java:1083)
at org.apache.pig.PigServer.openIterator(PigServer.java:994)
... 34 more
我試圖調試它,看看有什麼實際上發生了這種情況,當它試圖構建查詢計劃並獲取ExecJob時,卻發生了這種情況。我甚至試圖簡化腳本並刪除一切,但加載和存儲數據的代碼。結果是一樣的。
Pig在默認情況下使用PigStorage讀取,\ t是使用的默認分隔符。你確定top_queries_input_data.txt是相應的分隔嗎? WRT你的問題包括hadoop-mapreduce- *庫,你可以包括他們只爲測試。如果您使用gradle進行依賴性管理,則可以使用testCompile。我相信有一種方法可以在maven和其他依賴管理中做類似的操作。 – coder
是的,我在svn中使用了確切的數據(http://svn.apache.org/viewvc/pig/trunk/test/data/pigunit/)。我認爲這個問題可能與PigServer的某些配置有關(我在LOCAL模式下運行它,但它可能有一些額外的配置),或者它可能與操作系統有關(我使用的是Ubuntu 14.04) –
是嗎?給你任何可以幫助縮小問題的堆棧跟蹤?此外,這是所有內存,所以我懷疑是否需要任何配置 – coder