Environment: hadoop 1.0.3, hbase 0.94.1, pig 0.11.1
I am running a pig script in Java program, I get the following error sometimes but not all the time. What the program does is it loads a file from hdfs, do some transformation and store it into hbase. My program is multi-threaded. And I've already made PigServer thread-safe and I have "/user/root" directory created in hdfs. Here is the snippet of the program and the exception I've got. Please advise.
pigServer = PigFactory.getServer();
URL path = getClass().getClassLoader().getResource("cfg/concatall.py");
LOG.info("CDNResolve2Hbase: reading concatall.py file from " + path.toString());
pigServer.getPigContext().getProperties().setProperty(PigContext.JOB_NAME,
"CDNResolve2Hbase");
pigServer.registerQuery("A = load '" + inputPath + "' using PigStorage(' ') as (ip:chararray, do:chararray, cn:chararray, cdn:chararray, firsttime:chararray, updatetime:chararray);");
pigServer.registerCode(path.toString(),"jython","myfunc");
pigServer.registerQuery("B = foreach A generate myfunc.concatall('"+ extractTimestamp (inputPath)+"',ip,do,cn), cdn, SUBSTRING(firsttime,0,8);");
outputTable = "hbase://" + outputTable;
ExecJob job = pigServer.store ("B",outputTable,"org.apache.pig.backend.hadoop.hbase.HBaseStorage('d:cdn d:dtime')");
and my PigFactory has the following code
private static ThreadLocal<PigServer> pigServer = new ThreadLocal<PigServer>();
public static synchronized PigServer getServer() {
if (pigServer.get() == null) {
try
{ printClassPath(); Properties prop = SystemUtils.getCfg(); pigServer.set(new PigServer (ExecType.MAPREDUCE, prop)); return pigServer.get(); }
catch (Exception e)
{ LOG.error("error in starting PigServer:", e); return null; }
}
return pigServer.get();
}
org.apache.pig.impl.logicalLayer.FrontendException: ERROR 1000: Error during parsing.
Unable to check name hdfs://DC-001:9000/user/root
at org.apache.pig.PigServer$Graph.parseQuery(PigServer.java:1607)
at org.apache.pig.PigServer$Graph.registerQuery(PigServer.java:1546)
at org.apache.pig.PigServer.registerQuery(PigServer.java:516)
at org.apache.pig.PigServer.registerQuery(PigServer.java:529)
at com.hugedata.cdnserver.datanalysis.CDNResolve2Hbase.execute(Unknown Source)
at com.hugedata.cdnserver.DatAnalysis.cdnResolve2Hbase(Unknown Source)
at com.hugedata.cdnserver.task.HandleDomainNameLogTask.execute(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.springframework.util.MethodInvoker.invoke(MethodInvoker.java:273)
at org.springframework.scheduling.quartz.MethodInvokingJobDetailFactoryBean$MethodInvokingJob.executeInternal(MethodInvokingJobDetailFactoryBean.java:264)
at org.springframework.scheduling.quartz.QuartzJobBean.execute(QuartzJobBean.java:86)
at org.quartz.core.JobRunShell.run(JobRunShell.java:203)
at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:520)
Caused by: Failed to parse: Pig script failed to parse:
pig script failed to validate: org.apache.pig.backend.datastorage.DataStorageException: ERROR 6007: Unable to check name hdfs://DC-001:9000/user/root
at org.apache.pig.parser.QueryParserDriver.parse(QueryParserDriver.java:191)
at org.apache.pig.PigServer$Graph.parseQuery(PigServer.java:1599)
... 15 more
Caused by:
pig script failed to validate: org.apache.pig.backend.datastorage.DataStorageException: ERROR 6007: Unable to check name hdfs://DC-001:9000/user/root
at org.apache.pig.parser.LogicalPlanBuilder.buildLoadOp(LogicalPlanBuilder.java:835)
at org.apache.pig.parser.LogicalPlanGenerator.load_clause(LogicalPlanGenerator.java:3236)
at org.apache.pig.parser.LogicalPlanGenerator.op_clause(LogicalPlanGenerator.java:1315)
at org.apache.pig.parser.LogicalPlanGenerator.general_statement(LogicalPlanGenerator.java:799)
at org.apache.pig.parser.LogicalPlanGenerator.statement(LogicalPlanGenerator.java:517)
at org.apache.pig.parser.LogicalPlanGenerator.query(LogicalPlanGenerator.java:392)
at org.apache.pig.parser.QueryParserDriver.parse(QueryParserDriver.java:184)
... 16 more
Caused by: org.apache.pig.backend.datastorage.DataStorageException: ERROR 6007: Unable to check name hdfs://DC-001:9000/user/root
at org.apache.pig.backend.hadoop.datastorage.HDataStorage.isContainer(HDataStorage.java:207)
at org.apache.pig.backend.hadoop.datastorage.HDataStorage.asElement(HDataStorage.java:128)
at org.apache.pig.backend.hadoop.datastorage.HDataStorage.asElement(HDataStorage.java:138)
at org.apache.pig.parser.QueryParserUtils.getCurrentDir(QueryParserUtils.java:91)
at org.apache.pig.parser.LogicalPlanBuilder.buildLoadOp(LogicalPlanBuilder.java:827)
... 22 more
Caused by: java.io.IOException: Filesystem closed
at org.apache.hadoop.hdfs.DFSClient.checkOpen(DFSClient.java:264)
at org.apache.hadoop.hdfs.DFSClient.getFileInfo(DFSClient.java:873)
at org.apache.hadoop.hdfs.DistributedFileSystem.getFileStatus(DistributedFileSystem.java:513)
at org.apache.hadoop.fs.FileSystem.exists(FileSystem.java:768)
at org.apache.pig.backend.hadoop.datastorage.HDataStorage.isContainer(HDataStorage.java:200)
... 26 more
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