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Posted to common-commits@hadoop.apache.org by Apache Wiki <wi...@apache.org> on 2008/10/09 20:32:38 UTC
[Hadoop Wiki] Trivial Update of "Hbase/Troubleshooting" by stack
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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.