RE: Java 11 support in Cassandra 4.0 + Early Testing and Feedback

2018-09-07 Thread Kyrylo Lebediev
As many people use Oracle JDK, I think it worth mentioning that according Oracle Support Roadmap there are some changes in their policies for Java 11 and above (http://www.oracle.com/technetwork/java/eol-135779.html). In particular: “Starting with Java SE 9, in addition to providing Oracle JDK f

RE: [EXTERNAL] Re: adding multiple node to a cluster, cleanup and num_tokens

2018-09-07 Thread onmstester onmstester
Why not setting default vnodes count to that recommendation in Cassandra installation files?  Sent using Zoho Mail On Tue, 04 Sep 2018 17:35:54 +0430 Durity, Sean R wrote   Longer term, I agree with Oleksandr, the recommendation for number of vnodes is now much smaller than 256. I am

Failure reason for batch conditional update

2018-09-07 Thread Long Quanzheng
Hi I did a logged batch of conditional update, and sometimes(not always) got failure, and return of conflicting columns show that there is no conflicting value. Is there any other reason that batch can fail? My batch is like: ``` update tblA set col1=1 where pk=1 and col1=1; //to make sure no othe

Fwd: Re: Cluster CPU usage limit

2018-09-07 Thread onmstester onmstester
Actually its 256 Native Transport threads, the number of concurrent threads on each node is 32. My main concern is, What amount of CPU capacity should i keep free for tasks other than write that includes compaction and read? Sent using Zoho Mail Forwarded message From :

Re: Too many tombstones using TTL

2018-09-07 Thread Charulata Sharma (charshar)
Hi, I have struggled a lot with tombstones and finally learnt the following: - Deletes are not the only operation that cause tombstones. Check if you are inserting any nulls in any of the table columns. If yes then if you use Prepared statements, then you can unset the null value.

RE: nodetool cleanup - compaction remaining time

2018-09-07 Thread Steinmaurer, Thomas
I have created https://issues.apache.org/jira/browse/CASSANDRA-14701 Please adapt as needed. Thanks! Thomas From: Jeff Jirsa Sent: Donnerstag, 06. September 2018 07:52 To: cassandra Subject: Re: nodetool cleanup - compaction remaining time Probably worth a JIRA (especially if you can repro in