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From Joel Samuelsson <samuelsson.j...@gmail.com>
Subject Re: Weird timeouts
Date Mon, 10 Mar 2014 08:14:05 GMT
I am on Cassandra 2.0.5. How can I use the trace functionality?

I did not check for exceptions. I will rerun and check.

Thanks for suggestions.

/Joel


2014-03-07 17:54 GMT+01:00 Duncan Sands <duncan.sands@gmail.com>:

> Hi Joel,
>
>
> On 07/03/14 15:22, Joel Samuelsson wrote:
>
>> I try to fetch all the row keys from a column family (there should only
>> be a
>> couple of hundred in that CF) in several different ways but I get timeouts
>> whichever way I try:
>>
>
> did you check the node logs for exceptions?  You can get this kind of
> thing if there is an assertion failure when reading a particular row due to
> corruption for example.
>
> Ciao, Duncan.
>
>
>
>> Through the cassandra cli:
>> Fetching 45 rows is fine:
>> list cf limit 46 columns 0;
>> .
>> .
>> .
>> 45 Rows Returned.
>> Elapsed time: 298 msec(s).
>>
>> Fetching 46 rows however gives me a timeout after a minute or so:
>> list cf limit 46 columns 0;
>> null
>> TimedOutException()...
>>
>> Through pycassa:
>> keys = cf.get_range(column_count = 1, buffer_size = 2)
>>
>> for key, val in keys:
>>       print key
>>
>> This prints some keys and then gets stuck at the same place each time and
>> then
>> timeouts.
>>
>> The columns (column names + value) in the rows should be less than 100
>> bytes
>> each, though there may be a lot of them on a particular row.
>>
>> To me it seems like one of the rows take too long time to fetch but I
>> don't know
>> why since I am limitiing the number of columns to 0. Without seeing the
>> row, I
>> have a hard time knowing what could be wrong. Do you have any ideas?
>>
>>
>>
>

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