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From Apache Wiki <wikidi...@apache.org>
Subject [Hadoop Wiki] Trivial Update of "Hbase/Troubleshooting" by stack
Date Thu, 09 Oct 2008 18:32:38 GMT
Dear Wiki user,

You have subscribed to a wiki page or wiki category on "Hadoop Wiki" for change notification.

The following page has been changed by stack:
http://wiki.apache.org/hadoop/Hbase/Troubleshooting

The comment on the change is:
Added TOC

------------------------------------------------------------------------------
+ == Contents ==
+  1. [#1 Problem: Master initializes, but Region Servers do not]
+  1. [#2 Problem: Created Root Directory for HBase through Hadoop DFS]
+  1. [#3 Problem: Replay of hlog required, forcing regionserver restart]
+  2. [#4 Problem: Master initializes, but Region Servers do not]
+  1. [#5 Problem: On migration, no files in root directory]
+ 
+ [[Anchor(1)]]
  == Problem: Master initializes, but Region Servers do not ==
   * Master's log contains repeated instances of the following block:
    ~-INFO org.apache.hadoop.ipc.Client: Retrying connect to server: /127.0.0.1:60020. Already
tried 1 time(s).[[BR]]
@@ -30, +38 @@

  127.0.0.1		localhost.localdomain localhost
  ::1		localhost6.localdomain6 localhost6
  }}}
+ [[Anchor(2)]] 
  == Problem: Created Root Directory for HBase through Hadoop DFS ==
   * On Startup, Master says that you need to run the hbase migrations script. Upon running
that, the hbase migrations script says no files in root directory.
  === Causes ===
@@ -37, +46 @@

  === Resolution ===
   * Make sure the HBase root directory does not currently exist or has been initialized by
a previous run of HBase. Sure fire solution is to just use Hadoop dfs to delete the HBase
root and let HBase create and initialize the directory itself.
  
+ [[Anchor(3)]]
  == Problem: Replay of hlog required, forcing regionserver restart ==
   * Under a heavy write load, some regions servers will go down with the following exception:

  {{{
@@ -57, +67 @@

  === Resolution ===
   * Either reduce the load or add more memory/machines.
  
- 
+ [[Anchor(4)]]
  == Problem: Master initializes, but Region Servers do not ==
   * Master's log contains repeated instances of the following block:
    ~-INFO org.apache.hadoop.ipc.Client: Retrying connect to server: /127.0.0.1:60020. Already
tried 1 time(s).[[BR]]
@@ -88, +98 @@

  127.0.0.1		localhost.localdomain localhost
  ::1		localhost6.localdomain6 localhost6
  }}}
- == Problem: Created Root Directory for HBase through Hadoop DFS ==
+ 
+ [[Anchor(5)]]
+ == Problem: On migration, no files in root directory ==
   * On Startup, Master says that you need to run the hbase migrations script. Upon running
that, the hbase migrations script says no files in root directory.
  === Causes ===
   * HBase expects the root directory to either not exist, or to have already been initialized
by hbase running a previous time. If you create a new directory for HBase using Hadoop DFS,
this error will occur.

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