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https://issues.apache.org/jira/browse/HADOOP-984?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12470825
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Owen O'Malley commented on HADOOP-984:
--------------------------------------
+1
> Exception while retrieving a map output index file is not reported to
> JobTracker
> --------------------------------------------------------------------------------
>
> Key: HADOOP-984
> URL: https://issues.apache.org/jira/browse/HADOOP-984
> Project: Hadoop
> Issue Type: Bug
> Components: mapred
> Affects Versions: 0.11.0
> Reporter: Nigel Daley
> Assigned To: Arun C Murthy
> Priority: Critical
> Fix For: 0.11.1
>
> Attachments: HADOOP-984_20070207_1.patch
>
>
> The index file of a map output reported a checksum error and was moved to
> "bad_file" dir. Reduces, however, continued to attempt retrieval of the file
> forever. It seem the checksum exception did *NOT* result in the map's
> TaskTracker reporting to the JobTracker that the map output was lost. This
> was likely introduced by HADOOP-331.
> TaskTracker log:
> 2007-02-06 09:06:19,200 WARN org.apache.hadoop.dfs.DistributedFileSystem:
> Moving bad file
> /foo/testbase/tmp/mapred/local2/task_0002_m_011745_0/file.out.index to
> /foo/bad_files/file.out.index.-48633003
> 2007-02-06 09:06:19,203 INFO org.apache.hadoop.fs.DataInputStream: Found
> checksum error: org.apache.hadoop.fs.ChecksumException: Checksum error:
> /foo/testbase/tmp/mapred/local2/task_0002_m_011745_0/file.out.index at 363792
> at
> org.apache.hadoop.fs.FSDataInputStream$Checker.verifySum(FSDataInputStream.java:167)
> at
> org.apache.hadoop.fs.FSDataInputStream$Checker.read(FSDataInputStream.java:125)
> at
> org.apache.hadoop.fs.FSDataInputStream$PositionCache.read(FSDataInputStream.java:218)
> at java.io.BufferedInputStream.fill(BufferedInputStream.java:218)
> at java.io.BufferedInputStream.read(BufferedInputStream.java:235)
> at
> org.apache.hadoop.fs.FSDataInputStream$Buffer.read(FSDataInputStream.java:281)
> at
> org.apache.hadoop.fs.FSDataInputStream$Buffer.seek(FSDataInputStream.java:268)
> at
> org.apache.hadoop.fs.FSDataInputStream.seek(FSDataInputStream.java:331)
> at
> org.apache.hadoop.mapred.TaskTracker$MapOutputServlet.doGet(TaskTracker.java:1533)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
> at
> org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:427)
> at
> org.mortbay.jetty.servlet.WebApplicationHandler.dispatch(WebApplicationHandler.java:475)
> at
> org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:567)
> at org.mortbay.http.HttpContext.handle(HttpContext.java:1565)
> at
> org.mortbay.jetty.servlet.WebApplicationContext.handle(WebApplicationContext.java:635)
> at org.mortbay.http.HttpContext.handle(HttpContext.java:1517)
> at org.mortbay.http.HttpServer.service(HttpServer.java:954)
> at org.mortbay.http.HttpConnection.service(HttpConnection.java:814)
> at org.mortbay.http.HttpConnection.handleNext(HttpConnection.java:981)
> at org.mortbay.http.HttpConnection.handle(HttpConnection.java:831)
> at
> org.mortbay.http.SocketListener.handleConnection(SocketListener.java:244)
> at org.mortbay.util.ThreadedServer.handle(ThreadedServer.java:357)
> at org.mortbay.util.ThreadPool$PoolThread.run(ThreadPool.java:534)
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