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https://issues.apache.org/jira/browse/HDFS-2011?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13041858#comment-13041858
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Ravi Prakash commented on HDFS-2011:
------------------------------------
I had been automating tests to verify the removal and restoration of storage
directories. I was testing by setting up a loopback file system, using that as
one of the storage directories, and filling it up to make the writes from
Hadoop namenode to the checkpoint fail.
Mostly I would see the functionality work. However, very often I would see this
exception in the logs:
2011-05-29 23:34:30,241 WARN org.mortbay.log: /getimage: java.io.IOException:
GetImage failed. java.io.IOException: No space left on device
at java.io.FileOutputStream.writeBytes(Native Method)
at java.io.FileOutputStream.write(FileOutputStream.java:297)
at
org.apache.hadoop.hdfs.server.namenode.TransferFsImage.getFileClient(TransferFsImage.java:224)
at
org.apache.hadoop.hdfs.server.namenode.GetImageServlet$1$1.run(GetImageServlet.java:101)
at
org.apache.hadoop.hdfs.server.namenode.GetImageServlet$1$1.run(GetImageServlet.java:98)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:416)
at
org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1131)
at
org.apache.hadoop.hdfs.server.namenode.GetImageServlet$1.run(GetImageServlet.java:97)
at
org.apache.hadoop.hdfs.server.namenode.GetImageServlet$1.run(GetImageServlet.java:74)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:416)
at
org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1131)
at
org.apache.hadoop.hdfs.server.namenode.GetImageServlet.doGet(GetImageServlet.java:74)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:502)
at
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1124)
at
org.apache.hadoop.http.HttpServer$QuotingInputFilter.doFilter(HttpServer.java:871)
at
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1115)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:361)
at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:766)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:417)
at
org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:230)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.Server.handle(Server.java:324)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:534)
at
org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:864)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:533)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:207)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:403)
at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409)
at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:522)
In this case the storage directory wasn't taken offline. It would not be
removed from the list. John George figured out this was because the IOException
was happening in a code path fromm where the function to remove the
corresponding wasn't being called.
Also, very rarely, I would see this exception
2011-04-05 17:36:56,187 INFO org.apache.hadoop.ipc.Server: IPC Server handler
87 on 8020, call getEditLogSize() from
98.137.97.99:35862: error: java.io.IOException: java.lang.NullPointerException
java.io.IOException: java.lang.NullPointerException
at
org.apache.hadoop.hdfs.server.namenode.EditLogFileOutputStream.close(EditLogFileOutputStream.java:109)
at
org.apache.hadoop.hdfs.server.namenode.FSEditLog.processIOError(FSEditLog.java:299)
at
org.apache.hadoop.hdfs.server.namenode.FSEditLog.getEditLogSize(FSEditLog.java:849)
at
org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getEditLogSize(FSNamesystem.java:4270)
at
org.apache.hadoop.hdfs.server.namenode.NameNode.getEditLogSize(NameNode.java:1095)
at sun.reflect.GeneratedMethodAccessor6.invoke(Unknown Source)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at
org.apache.hadoop.ipc.WritableRpcEngine$Server.call(WritableRpcEngine.java:346)
at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1399)
at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1395)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:396)
at
org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1094)
at org.apache.hadoop.ipc.Server$Handler.run(Server.java:1393)
After this, the Secondary Namenode and the Namenode would go into infinite
loops of this NullPointerExceptions. John George figured out this was because
close was being called on the editStream twice (so it was trying to close an
editstream which was already closed).
> Removal and restoration of storage directories on checkpointing failure
> doesn't work properly
> ---------------------------------------------------------------------------------------------
>
> Key: HDFS-2011
> URL: https://issues.apache.org/jira/browse/HDFS-2011
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: name-node
> Affects Versions: 0.23.0
> Reporter: Ravi Prakash
> Assignee: Ravi Prakash
> Attachments: HDFS-2011.patch
>
>
> Removal and restoration of storage directories on checkpointing failure
> doesn't work properly. Sometimes it throws a NullPointerException and
> sometimes it doesn't take off a failed storage directory
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