Fsync-ing the write ahead log in sync threads

That massive filesystem thread Did you know?

Fsync-ing the write ahead log in sync threads

Monday, September 27, Database speed tests mysql and postgresql - part 1 There has been major changes in mysql and postgres over a couple of years. Mysql has been focusing on improving and optimizing innodb. Postgres on the other hand has been focusing on database replication and hot standby.

Recently postgres came out with version 9. Earlier people used to shy away from postgres because there was no proper "easily deployable" solution available for replication. Now with this release, postgres had taken a major step forward.

Here is a list of all the new features in MySQL 5. And i believe it is time i do some rough benchmarks and post it out. The scope is to check out innodb tables in mysql 5. I am focusing only on inserts and selects. And i will be benchmarking pure inserts and selects only.

Thie blog focuses only on inserts. I will be focusing on selects in my next blog.

fsync-ing the write ahead log in sync threads

I am running these tests on my laptop which has a Intel Core 2 Duo T 2. Which spawns out multiple php scripts that work on background.

Linux schedulers in tpcc like benchmark

Let me know if you need the scripts and i will share it with you.configuring zookeeper # Closed daTokenizer opened this Issue Aug 18, · 3 comments Comments. Assignees No one assigned Labels question.

fsync-ing the write ahead log in SyncThread:0 took ms which will adversely effect operation latency. See the ZooKeeper troubleshooting guide.

Zookeeper is running into errors while attempting to commit its sync log.

fsync-ing the write ahead log in sync threads

Since Zookeeper is spinning its own event loop (NIO), if its blocked waiting for quorum and trying to write the sync-log, clients will not receive pings.

Long, highly-technical, and animated discussion threads are certainly not unheard of on the linux-kernel mailing list. Even by linux-kernel standards, though, the thread that followed the announcement was impressive.

Over the course of hundreds of messages, kernel developers argued about several aspects of how filesystems and . See the ZooKeeper troubleshooting guide [junit4] 2> T rutadeltambor.coms Watcher [email protected] name:ZooKeeperConnection Watcher got event WatchedEvent state:SyncConnected type:None path:null path:null type:None [junit4] 2> T rutadeltambor.comtionManager.

Vadim Tkachenko. Vadim Tkachenko co-founded Percona in and serves as its Chief Technology Officer. Vadim leads Percona Labs, which focuses on technology research and performance evaluations of Percona’s and third-party products.

Zookeeper is running into errors while attempting to commit its sync log. Since Zookeeper is spinning its own event loop (NIO), if its blocked waiting for quorum and trying to write the sync-log.

Solved: Zookeeper slow fsync followed by CancelledKeyExcep - Cloudera Community