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fix for "java.io.IOException: No FileSystem for scheme: hdfs" error 

aka workaround for https://issues.apache.org/jira/browse/HDFS-8750
This commit is contained in:
Himanshu Gupta 2015-09-10 13:12:32 -05:00
parent 252bb5a6bc
commit b989a7054c
1 changed files with 15 additions and 0 deletions
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15
extensions/hdfs-storage/src/main/java/io/druid/storage/hdfs/HdfsStorageDruidModule.java
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@ -19,6 +19,7 @@ package io.druid.storage.hdfs;
import com.fasterxml.jackson.core.Version;
import com.fasterxml.jackson.databind.Module;
import com.google.common.base.Throwables;
import com.google.common.collect.ImmutableList;
import com.google.inject.Binder;
import com.google.inject.Inject;
@ -31,7 +32,9 @@ import io.druid.initialization.DruidModule;
import io.druid.storage.hdfs.tasklog.HdfsTaskLogs;
import io.druid.storage.hdfs.tasklog.HdfsTaskLogsConfig;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import java.io.IOException;
import java.util.List;
import java.util.Properties;
@ -92,6 +95,18 @@ public class HdfsStorageDruidModule implements DruidModule
// Set explicit CL. Otherwise it'll try to use thread context CL, which may not have all of our dependencies.
conf.setClassLoader(getClass().getClassLoader());
// Ensure that FileSystem class level initialization happens with correct CL
// See https://github.com/druid-io/druid/issues/1714
ClassLoader currCtxCl = Thread.currentThread().getContextClassLoader();
try {
Thread.currentThread().setContextClassLoader(getClass().getClassLoader());
FileSystem.get(conf);
} catch(IOException ex) {
throw Throwables.propagate(ex);
} finally {
Thread.currentThread().setContextClassLoader(currCtxCl);
}
if (props != null) {
for (String propName : System.getProperties().stringPropertyNames()) {
if (propName.startsWith("hadoop.")) {