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Date: Tue, 7 Oct 2008 14:58:44 -0700 (PDT)
From: "Hairong Kuang (JIRA)" <jira@apache.org>
To: core-dev@hadoop.apache.org
Subject: [jira] Commented: (HADOOP-4351) ArrayIndexOutOfBoundsException
 during fsck
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    [ https://issues.apache.org/jira/browse/HADOOP-4351?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12637671#action_12637671 ] 

Hairong Kuang commented on HADOOP-4351:
---------------------------------------

> it appears that the error happens when there are corrupt entries which are not in the blocksMap, but they are in the corruptReplicas object.

The solutions discussed avoid the exception to be thrown, but it does not fix the above fundamental problem.

> ArrayIndexOutOfBoundsException during fsck
> ------------------------------------------
>
>                 Key: HADOOP-4351
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4351
>             Project: Hadoop Core
>          Issue Type: Bug
>    Affects Versions: 0.18.1
>            Reporter: Brian Bockelman
>         Attachments: fsck_hadoop_4351.patch
>
>
> After observing a lot of corrupted blocks, I suddenly started to get a lot of ArrayIndexOutOfBoundsException.
> It appears to be an issue very similar to HADOOP-3649, which is supposed to be fixed in 0.18.1.
> 2008-10-06 08:48:43,241 WARN /: /fsck?path=%2F:
> java.lang.ArrayIndexOutOfBoundsException: 2
>    at org.apache.hadoop.dfs.FSNamesystem.getBlockLocationsInternal(FSNamesystem.java:789)
>    at org.apache.hadoop.dfs.FSNamesystem.getBlockLocations(FSNamesystem.java:727)
>    at org.apache.hadoop.dfs.NamenodeFsck.check(NamenodeFsck.java:167)
>    at org.apache.hadoop.dfs.NamenodeFsck.check(NamenodeFsck.java:162)
>    at org.apache.hadoop.dfs.NamenodeFsck.check(NamenodeFsck.java:162)
>    at org.apache.hadoop.dfs.NamenodeFsck.check(NamenodeFsck.java:162)
>    at org.apache.hadoop.dfs.NamenodeFsck.check(NamenodeFsck.java:162)
>    at org.apache.hadoop.dfs.NamenodeFsck.fsck(NamenodeFsck.java:128)
>    at org.apache.hadoop.dfs.FsckServlet.doGet(FsckServlet.java:48)
>    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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