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From Jonathan Ellis <>
Subject Re: cassandra freezes
Date Thu, 25 Feb 2010 14:13:52 GMT
Then you should check GC timing with -Xverbose:gc option (see: for how to modify
jvm options) for a correlation.

On Thu, Feb 25, 2010 at 8:09 AM, Boris Shulman <> wrote:
> In these tests I perform only write operations, no reads.
> On Thu, Feb 25, 2010 at 4:07 PM, Jonathan Ellis <> wrote:
>> The only kind of "freeze" that makes sense there is your reads are i/o
>> bound and the extra disk activity is killing you.  In that case the
>> fix is to add more RAM, or give less to the JVM so the OS can use more
>> for buffer cache.
>> On Thu, Feb 25, 2010 at 8:01 AM, Boris Shulman <> wrote:
>>> In my case the cassandra node freezes while memtable flush operation
>>> is performed or compactation operation is performed. How can I
>>> optimize the cassandra configuration in order to avoid this behavior?
>>> I've tried both using large memtable size (1G) and small (128M) but in
>>> every case I have some sort of freezes when the data is flushed to the
>>> disk.
>>> Please advice.

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