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From Minh Duc Nguyen <mdngu...@gmail.com>
Subject Re: HBase Cannot Start Again After Sudden Power-Off
Date Sun, 22 Jul 2012 16:58:36 GMT
Bing, as far as why HBase is configured as such, it's by design.  The HBase
documentation is very clear in explaining that pseudo-distributed mode is
for "configuration testing and prototyping."


In order to make it as easy as possible for people to get up and running
with HBase, the default configuration for HBase in pseudo-distributed mode
is to use /tmp.  Of course, when linux restarts, it will clear out the /tmp
directory.  Since you've been running HBase for 4 months now, it may be
worth your while to setup a small HBase cluster in fully-distributed mode.
 While convenient, HBase in pseudo-distributed mode will not be as reliable
as fully-distributed.

   ~ Minh

On Sun, Jul 22, 2012 at 5:29 AM, Bing Li <lblabs@gmail.com> wrote:

> Dear all,
> I have used HBase in the pseudo-distributed mode for four months. Last
> night a sudden power-off shut down my HBase machine abnormally. Thereafter,
> HBase could be started.
> I had to reinstall my HBase again. This is a very bad experience. It is
> fortunate that my system is in a development stage. If it works for a
> business, that must be a disaster.
> I guess the problem is caused because some configuration data is written in
> /tmp. I really DON'T understand why the designers of Hadoop/HBase did that!
> I have to change a lot of configurations to avoid configuration data loss
> in /tmp.
> After reinstallation, HBase can be started normally. Then, I shut down
> HBase/Hadoop and turned the machine off.
> But, today I got another problem. When starting the system, HBase could not
> be started again! I checked the files in /tmp and noticed that HBase wrote
> some Jetty-related files in it.
>    ...
>    drwxr-xr-x  4 libing libing 4096 2012-07-22 16:27
> Jetty_0_0_0_0_50070_hdfs____w2cu08
>    drwxr-xr-x  4 libing libing 4096 2012-07-22 16:27
> Jetty_0_0_0_0_50090_secondary____y6aanv
>    drwxr-xr-x  4 libing libing 4096 2012-07-22 16:27
> Jetty_0_0_0_0_50075_datanode____hwtdwq
>    ...
> I didn't see them before. I guess that's the problem why HBase cannot be
> started? If so, could you please tell me how to force HBase to write the
> Jetty-related files to the directories other than /tmp?
> Your help is highly appreciated!
> Best regards,
> Bing

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