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Date: Wed, 9 May 2012 16:05:49 +0000 (UTC)
From: "Zhihong Yu (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
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Subject: [jira] [Commented] (HBASE-5964) HFileSystem: "No FileSystem for
 scheme: hdfs"
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    [ https://issues.apache.org/jira/browse/HBASE-5964?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13271512#comment-13271512 ] 

Zhihong Yu commented on HBASE-5964:
-----------------------------------

The default is true in hadoop. A few examples:
{code}
    conf.set("fs.hdfs.impl.disable.cache", "true");
./hadoop-hdfs-project/hadoop-hdfs-httpfs/src/main/java/org/apache/hadoop/lib/service/hadoop/FileSystemAccessService.java
            clientConf.setBoolean("fs.hdfs.impl.disable.cache", true);
./hadoop-mapreduce-project/src/contrib/raid/src/java/org/apache/hadoop/hdfs/DistributedRaidFileSystem.java
{code}
                
> HFileSystem: "No FileSystem for scheme: hdfs"
> ---------------------------------------------
>
>                 Key: HBASE-5964
>                 URL: https://issues.apache.org/jira/browse/HBASE-5964
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 0.94.0, 0.96.0
>         Environment: Hadoop 2.0.0-alpha-SNAPSHOT, HBase 0.94.0-SNAPSHOT
>            Reporter: Andrew Purtell
>            Assignee: Andrew Purtell
>         Attachments: HBASE-5964.patch
>
>
> I've been seeing this with Hadoop 2.0.0-alpha-SNAPSHOT and HBase 0.94.0-SNAPSHOT:
> {noformat}
> 2012-05-08 15:18:00,692 FATAL [RegionServer:0;acer.localdomain,48307,1336515479011] regionserver.HRegionServer(1674): ABORTING region server acer.localdomain,48307,1336515479011: Unhandled exception: No FileSystem for scheme: hdfs
> java.io.IOException: No FileSystem for scheme: hdfs
> 	at org.apache.hadoop.hbase.fs.HFileSystem.newInstanceFileSystem(HFileSystem.java:146)
> 	at org.apache.hadoop.hbase.fs.HFileSystem.<init>(HFileSystem.java:75)
> 	at org.apache.hadoop.hbase.regionserver.HRegionServer.handleReportForDutyResponse(HRegionServer.java:973)
> 	at org.apache.hadoop.hbase.MiniHBaseCluster$MiniHBaseClusterRegionServer.handleReportForDutyResponse(MiniHBaseCluster.java:110)
> 	at org.apache.hadoop.hbase.regionserver.HRegionServer.run(HRegionServer.java:671)
> 	at org.apache.hadoop.hbase.MiniHBaseCluster$MiniHBaseClusterRegionServer.runRegionServer(MiniHBaseCluster.java:136)
> 	at org.apache.hadoop.hbase.MiniHBaseCluster$MiniHBaseClusterRegionServer.access$000(MiniHBaseCluster.java:89)
> 	at org.apache.hadoop.hbase.MiniHBaseCluster$MiniHBaseClusterRegionServer$1.run(MiniHBaseCluster.java:120)
> 	at java.security.AccessController.doPrivileged(Native Method)
> 	at javax.security.auth.Subject.doAs(Subject.java:357)
> 	at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1212)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
> 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> 	at java.lang.reflect.Method.invoke(Method.java:616)
> 	at org.apache.hadoop.hbase.util.Methods.call(Methods.java:37)
> 	at org.apache.hadoop.hbase.security.User.call(User.java:586)
> 	at org.apache.hadoop.hbase.security.User.access$700(User.java:50)
> 	at org.apache.hadoop.hbase.security.User$SecureHadoopUser.runAs(User.java:426)
> 	at org.apache.hadoop.hbase.MiniHBaseCluster$MiniHBaseClusterRegionServer.run(MiniHBaseCluster.java:118)
> 	at java.lang.Thread.run(Thread.java:679)
> {noformat}
> Not sure precisely when it started. First I thought it might be due to HBASE-5955 but I cherry picked that change over from trunk. Then I got HBASE-5963 out of the way.  

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