We noticed that streaming will take about 10 hours,all the left is 
compaction,we will improve  concurrent_compactors first.

Thanks all for your reply.

------------------ ???????? ------------------
??????: "Jon Haddad";<j...@jonhaddad.com>;
????????: 2017??11??1??(??????) ????4:06
??????: "user"<user@cassandra.apache.org>;

????: Re: Tuning bootstrap new node

Of all the settings you could change, why one that??s related to memtables?  
Streaming doesn??t go through the write path, memtables aren??t involved unless 
you??re using materialized views or CDC.

On Oct 31, 2017, at 11:44 AM, Anubhav Kale <anubhav.k...@microsoft.com.INVALID> 

You can change YAML setting of memtable_cleanup_threshold to 0.7 (from the 
default of 0.3). This will push SSTables to disk less often and will reduce the 
compaction time.
While this won??t change the streaming time, it will reduce the overall time 
for your node to be healthy.
From: Harikrishnan Pillai [mailto:hpil...@walmartlabs.com] 
Sent: Tuesday, October 31, 2017 11:28 AM
To: user@cassandra.apache.org
Subject: Re: Re: Tuning bootstrap new node


There is no magic in speeding up the node addition other than increasing stream 
throughput and compaction throughput.

it has been noticed that with heavy compactions the latency may go up if the 
node also start serving data.

if you really don't want  this node to service traffic till all compactions 
settle down, you can disable gossip and binary protocol using the nodetool 
command. This will allow compactions to continue but requires a repair to fix 
the stale data later.




From: Nitan Kainth <nitankai...@gmail.com>
Sent: Tuesday, October 31, 2017 5:47 AM
To: user@cassandra.apache.org
Subject: EXT: Re: Tuning bootstrap new node

Do not stop compaction, you will end up with thousands of sstables.

You increase stream throughput from default 200 to a heifer value if your 
network can handle it.
Sent from my iPhone

On Oct 31, 2017, at 6:35 AM, Peng Xiao <2535...@qq.com> wrote:

Can we stop the compaction during the new node bootstraping and enable it after 
the new node joined?



------------------ Original ------------------

From:  "????????????";<2535...@qq.com>;

Date:  Tue, Oct 31, 2017 07:18 PM

To:  "user"<user@cassandra.apache.org>;

Subject:  Tuning bootstrap new node


Dear All,

Can we make some tuning to make bootstrap new node more quick?We have a three 
DC cluster(RF=3 in two DCs,RF=1 in another ,48 nodes in the DC with RF=3).As 
the Cluster is becoming larger and larger,we need to spend more than 24 hours 
to bootstrap a new node.

Could you please advise how to tune this ?


Many Thanks,

Peng Xiao

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