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From xutom <>
Subject Re:Re: cassandra full gc too long
Date Tue, 29 Dec 2015 07:04:23 GMT

Thanks for ur reply. Exactly I have splitted that table into 47*20=940 parts, I have 47 partitions
and each partition also has 20 buckets, so everytime I execute such cql: select * from table
where partition_id=a and bucket_id=b, and the number of each select result maybe 40-80 million.

What the " modern CQL client with paging support" mean? Is there opensource CQL client ? 
I does not use any opensource CQL client and exporting data with my java code.

在 2015-12-29 11:38:51,"Robert Coli" <> 写道:

On Mon, Dec 28, 2015 at 5:57 PM, xutom <> wrote:

    I have 5 nodes in my C* cluster, and each node has the same configuration file(
MAX_HEAP_SIZE="32G" and HEAP_NEWSIZE="8G"), and My Cassandra version is 2.1.1. Now I want
to export all data of one table, i am using  select * from tablename,

Probably lower your heap size. If you're using CMS GC with 32gb heap you will get long GC

Also use a modern CQL client with paging support.

In addition, upgrade to the head of 2.1.x, 2.1.1 is not a version anyone should be using in
production at this time.


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