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" <rc...@eventbrite.com> 写道：
On Mon, Dec 28, 2015 at 5:57 PM, xutom <xutom2...@126.com> wrote:
I have 5 nodes in my C* cluster, and each node has the same configuration
file(Cassandra-env.sh: 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 pauses.
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.
=Rob
