Cassandra on Window with SCOM running
Hi, We are running an Old version of Cassandra 0.7.4 on Windows At one point, the average read times is 2.1 seconds when SCOM (System Center Operation Manager) is running, and 0.04 seconds when its disabled. The problem is we CANNOT disable SCOM on these Windows VMs. Any have seen this before? experience with SCOM in this situations? any comments of feedback that could help us improve the performance while this process is running? Other than upgrading Cassandra to the latest (we know this is an option but its NOT doable at this point). Thanks and Regards, Alaa -- *This message may contain confidential and privileged information. If it has been sent to you in error, please reply to advise the sender of the error and then immediately permanently delete it and all attachments to it from your systems. If you are not the intended recipient, do not read, copy, disclose or otherwise use this message or any attachments to it. The sender disclaims any liability for such unauthorized use. PLEASE NOTE that all incoming e-mails sent to PDF e-mail accounts will be archived and may be scanned by us and/or by external service providers to detect and prevent threats to our systems, investigate illegal or inappropriate behavior, and/or eliminate unsolicited promotional e-mails (“spam”). If you have any concerns about this process, please contact us at * *legal.departm...@pdf.com* legal.departm...@pdf.com*.*
create index on column of user defined type?
Although I have not seen any documentation that says one cannot do this, version 2.1.2 is complaining about defining one. CREATE TYPE wdm.thing ( thing_name text, ... CREATE TABLE wdm.ctins ( foo_no text, itemfrozenthing, ... CREATE INDEX foo ON wdm.gtins(item.thing_name); Is there something I'm missing or is this truly disallowed? This e-mail message, including any attachments, is for the sole use of the intended recipient(s) and may contain information that is confidential and protected by law from unauthorized disclosure. Any unauthorized review, use, disclosure or distribution is prohibited. If you are not the intended recipient, please contact the sender by reply e-mail and destroy all copies of the original message.
Re: create index on column of user defined type?
On 01/14/2015 02:49 PM, Mulert, Bill wrote: Although I have not seen any documentation that says one cannot do this, version 2.1.2 is complaining about defining one. CREATE TYPE wdm.thing ( thing_name _text_, … CREATE TABLE wdm.ctins ( foo_no text, _item_frozen_thing_, ... CREATE INDEX foo ON wdm.gtins(item.thing_name); Is there something I’m missing or is this truly disallowed? I believe this is planned for 3.0. https://issues.apache.org/jira/browse/CASSANDRA-6382 -- Michael
Schema changes: where in Java code are they sent?
Hello, I’m doing some research on schema migrations for Cassandra. I’ve been playing with cqlsh with TRACING ON, and I can see that a schema change like “CREATE TABLE” is sent to all nodes in the cluster. And also that “CREATE TABLE” fails if only one of my three nodes is up (with replication factor = 3). I’ve been trying to find the Java code where the schema migration is sent to the other nodes in the cluster, to understand what the requirements are for successfully applying the update. E.g.: is QUORUM consistency level applied? I spent an hour looking through the Java code last night, with no luck. I thought this code would be in StorageProxy.java, but I have not found it there, or in any of the other classes I looked at. Any pointers would be appreciated. Thanks, best regards, Rich
Re: Schema changes: where in Java code are they sent?
On Wed, Jan 14, 2015 at 5:13 PM, Richard Dawe rich.d...@messagesystems.com wrote: I’ve been trying to find the Java code where the schema migration is sent to the other nodes in the cluster, to understand what the requirements are for successfully applying the update. E.g.: is QUORUM consistency level applied? A quorum isn't required. Schema changes are simply applied against the local node (whichever node the client sends the query to) and then are pushed out to the other nodes. Nodes will also pull the latest schema from other nodes as needed (for example, if a node was down during a schema change). I spent an hour looking through the Java code last night, with no luck. I thought this code would be in StorageProxy.java, but I have not found it there, or in any of the other classes I looked at. MigrationManager is probably the most central class for this stuff. -- Tyler Hobbs DataStax http://datastax.com/
Re: Tracing On, Partion Index 0 entries found
Thanks! Tyler. So how does it affects seeking operation? I've seen for stables having some entries, next operation of seeking to data file take lesser time however when entry is 0 it takes few milliseconds.. On Jan 14, 2015 11:18 PM, Tyler Hobbs ty...@datastax.com wrote: It's referring to an index of the cells within the partition (in a single sstable). It can have zero entries when there are very few cells in the partition. On Wed, Jan 14, 2015 at 5:48 AM, nitin padalia padalia.ni...@gmail.com wrote: Hi, While Tracing is on, we see a trace message, Partition index with X entries found for sstable Y What does it actually means? Does it mean in 'Partion Index' file has X partion key:offset entries for SSTable Y? If so then when could X be 0? -- Nitin Padalia -- Tyler Hobbs DataStax http://datastax.com/
Script to count tombstones by partition key
Hi all I just recently put together a small script to count the number of tombstones grouped by partition id, for one or multiple sstables: https://gist.github.com/JensRantil/063b7c56ca4a8dfe1c50 I needed this for debugging purposes and thought I’d share it with you guys in case anyone is interested. Cheers, Jens ——— Jens Rantil Backend engineer Tink AB Email: jens.ran...@tink.se Phone: +46 708 84 18 32 Web: www.tink.se Facebook Linkedin Twitter
Re: Script to count tombstones by partition key
Nice, thanks Jens On Wed, Jan 14, 2015 at 4:21 PM, Jens Rantil jens.ran...@tink.se wrote: Hi all I just recently put together a small script to count the number of tombstones grouped by partition id, for one or multiple sstables: https://gist.github.com/JensRantil/063b7c56ca4a8dfe1c50 I needed this for debugging purposes and thought I’d share it with you guys in case anyone is interested. Cheers, Jens ——— Jens Rantil Backend engineer Tink AB Email: jens.ran...@tink.se Phone: +46 708 84 18 32 Web: www.tink.se Facebook Linkedin Twitter
Re: Tracing On, Partion Index 0 entries found
It's referring to an index of the cells within the partition (in a single sstable). It can have zero entries when there are very few cells in the partition. On Wed, Jan 14, 2015 at 5:48 AM, nitin padalia padalia.ni...@gmail.com wrote: Hi, While Tracing is on, we see a trace message, Partition index with X entries found for sstable Y What does it actually means? Does it mean in 'Partion Index' file has X partion key:offset entries for SSTable Y? If so then when could X be 0? -- Nitin Padalia -- Tyler Hobbs DataStax http://datastax.com/
Re: Script to count tombstones by partition key
On Wed, Jan 14, 2015 at 7:21 AM, Jens Rantil jens.ran...@tink.se wrote: I just recently put together a small script to count the number of tombstones grouped by partition id, for one or multiple sstables: https://github.com/cloudian/support-tools Has checksstablegarbage which does a similar thing without requiring the sstable2json step, which is likely to be faster overall. =Rob
YNT: Storing PDF data on Cassandra db
Hi , I have checked http://cassandra.apache.org The latest release is 2.1.2 .Do you know when will The 3.0 release be available? Thanks in advance -Orijinal İleti- Kimden: Jonathan Haddad j...@jonhaddad.com Gönderme tarihi: 13.1.2015 16:26 Kime: user@cassandra.apache.org user@cassandra.apache.org Konu: Re: Storing PDF data on Cassandra db For a new user, there's no point in learning Thrift if that user intends on upgrading past the version that they start with. Thrift is a deprecated protocol and there's no new functionality going into it. In 3.0 the sstable format is being upgraded to work primarily with native CQL partitions / rows and have a translation layer to work with thrift for compatibility. If you're simply storing k-v there's no reason (or advantage) to thrift over CQL. CREATE TABLE pdf ( pdf_id uuid primary key, content blob ); will work just fine. Adding additional fields as the system changes is convenient and works with any tool that reads CQL and won't require custom deserialization or any other nonsense. Jon On Tue Jan 13 2015 at 6:14:10 AM Peter Lin wool...@gmail.com wrote: you want to store the raw bytes, so look at examples for saving raw bytes. I generally recommend using Thrift if you're going to do a lot of read/write of binary data. CQL is good for primitive types, and maps/lists of primitive types. I'm bias, but it's simpler and easier to use thrift for storing file attachments. On Tue, Jan 13, 2015 at 8:58 AM, DENIZ nilgree...@gmail.com wrote: Hi All, I want to store PDF documents on Cassandra db.What is the best way to store this type of data on Cassandra.How can I insert and select PDF file to the database.If possible can you explain with sample CQL statements Thanks in Advance Nil
Tracing On, Partion Index 0 entries found
Hi, While Tracing is on, we see a trace message, Partition index with X entries found for sstable Y What does it actually means? Does it mean in 'Partion Index' file has X partion key:offset entries for SSTable Y? If so then when could X be 0? -- Nitin Padalia
