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[HDFS-2717] BookKeeper Journal output stream doesn't check addComplete rc - HDFS - [issue]
...As summary says, we're not checking the addComplete return code, so there's a change of losing update....
http://issues.apache.org/jira/browse/HDFS-2717    Author: Ivan Kelly, 2014-09-04, 01:59
[HDFS-3474] Cleanup Exception handling in BookKeeper journal manager - HDFS - [issue]
...There are a couple of instance of:try {  ...} catch (Exception e) {  ...}We should be catching the specific exceptions....
http://issues.apache.org/jira/browse/HDFS-3474    Author: Ivan Kelly, 2014-09-04, 01:59
Re: Zookeeper in multiple data centers - Zookeeper - [mail # user]
...Read this first:http://whilefalse.blogspot.ie/2012/12/building-global-highly-available.htmlGenerally, it's not "supported", but people have done it, but you should beaware of the consequence...
   Author: Ivan Kelly, 2014-08-26, 15:53
[HDFS-4265] BKJM doesn't take advantage of speculative reads - HDFS - [issue]
...BookKeeperEditLogInputStream reads entry at a time, so it doesn't take advantage of the speculative read mechanism introduced by BOOKKEEPER-336....
http://issues.apache.org/jira/browse/HDFS-4265    Author: Ivan Kelly, 2014-07-25, 11:03
[HDFS-4266] BKJM: Separate write and ack quorum - HDFS - [issue]
...BOOKKEEPER-208 allows the ack and write quorums to be different sizes to allow writes to be unaffected by any bookie failure. BKJM should be able to take advantage of this....
http://issues.apache.org/jira/browse/HDFS-4266    Author: Ivan Kelly, 2014-07-18, 15:11
[HDFS-4154] BKJM: Two namenodes usng bkjm can race to create the version znode - HDFS - [issue]
...nd one will get the following error.2012-11-06 10:04:00,200 INFO hidden.bkjournal.org.apache.zookeeper.ClientCnxn: Session establishment complete on server 109-231-69-172.flexiscale.com/109....
http://issues.apache.org/jira/browse/HDFS-4154    Author: Ivan Kelly, 2014-07-17, 15:00
[HDFS-3810] Implement format() for BKJM - HDFS - [issue]
...At the moment, formatting for BKJM is done on initialization. Reinitializing is a manual process. This JIRA is to implement the JournalManager#format API, so that BKJM can be formatting alon...
http://issues.apache.org/jira/browse/HDFS-3810    Author: Ivan Kelly, 2014-07-10, 15:55
Re: Disabling caching for Zookeeper disk writes. - Zookeeper - [mail # user]
...You need to turn it off with hdparm.sudo hdparm -W 0 /dev/-IvanOn Thu, Jun 12, 2014 at 01:05:25AM -0700, Anita Kar wrote: ...
   Author: Ivan Kelly, 2014-06-12, 09:03
[expand - 1 more] - Re: intern project idea: decouple zab from zookeeper - Zookeeper - [mail # dev]
...I was thinking from the point of view that if you want to provide ZABas a library, then the library will have to provide an RPC mechanismfor talking to other members of the quorum, and a mea...
   Author: Ivan Kelly, 2014-06-02, 14:59
Re: What should be the majority in an ensemble for Zookeeper - Zookeeper - [mail # user]
...On Thu, Apr 03, 2014 at 11:45:16AM -0700, chaitanya_r wrote:A majority is half the servers plus one. It can be any subset of theservers in the ensemble. In the case of 4 servers, a majority ...
   Author: Ivan Kelly, 2014-04-04, 17:19
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