About

I joined MongoDB in June 2015 and will be sharing hands-on information on how to make this technology work for you.

Prior to that I worked for MySQL/Sun/Oracle in product management for MySQL High Availability solutuions such as MySQL Cluster, MySQL Replication, MySQL Fabric, MySQL Group Replication and MySQL Router.

I started my career with Nortel (technically BNR which was the R&D arm of Northern Telecom but everything later got merged and rebranded as Nortel). I was responsible for writing the original proprietary, in-memory database for Nortel’s HLR product. Later on, we used a number of 3rd party databases for the HLR (provisioning rather than real-time) and then HSS – starting with Oracle for the HLR and then SOLID but then settling on MySQL Cluster as the scaleable real-time database for the HSS.

5 comments

  1. Pedro says:

    I have issues:

    Connect to MySQL Cluster Manager by running “/home/pedro/mysql-mcm/mcm1.2.4/bin/mcm” -a eletron:1862
    Configuring default cluster ‘mycluster’…
    ERROR: Unable to create site, aborting bootstrap!
    ERROR 2004: (00MGR) Host eletron is not a member of site mysite

    Helpe-me please! Thank you!

  2. Trevor Lowing says:

    Andrew,

    I’m working on a new project that requires clustered MySQL with capability of geographic redundancy. Who would you recommend for engaging consulting services? This in in Virginia.

    Thanks,

    Trevor

  3. sanil says:

    I have an issue with our mysql ndb cluster. Always throwing an error node x disconnected and Lost arbitrator node 1 – process failure [state=6].Could you please help me to resolve these issues. Is it related to network outage ?

    2015-11-18 09:50:18 [MgmtSrvr] ALERT — Node 1: Node 2 Disconnected
    2015-11-18 09:50:18 [MgmtSrvr] ALERT — Node 1: Node 3 Disconnected
    2015-11-18 09:50:18 [MgmtSrvr] ALERT — Node 1: Node 31 Disconnected
    2015-11-18 09:50:19 [MgmtSrvr] INFO — Node 1: Node 2 Connected
    2015-11-18 09:50:19 [MgmtSrvr] INFO — Node 1: Node 31 Connected
    2015-11-18 09:50:19 [MgmtSrvr] INFO — Node 1: Node 3 Connected
    2015-11-18 09:50:20 [MgmtSrvr] INFO — Node 31: Prepare arbitrator node 1
    [ticket=0b2700480bcc2992]
    2015-11-18 09:50:20 [MgmtSrvr] INFO — Node 3: Prepare arbitrator node 1
    [ticket=0b2700480bcc2992]
    2015-11-18 09:50:20 [MgmtSrvr] INFO — Node 2: Started arbitrator node 1
    [ticket=0b2700480bcc2992]
    2015-11-18 09:50:53 [MgmtSrvr] INFO — Node 7: Event buffer status:
    used=56KB(7%) alloc=708KB(0%) max=0B apply_epoch=12673679/9
    latest_epoch=12673679/12
    2015-11-18 09:51:05 [MgmtSrvr] INFO — Node 7: Event buffer status:
    used=1148B(10%) alloc=10816B(0%) max=0B apply_epoch=12673679/9
    latest_epoch=12673679/12
    2015-11-18 09:51:05 [MgmtSrvr] ALERT — Node 1: Node 2 Disconnected
    2015-11-18 09:51:05 [MgmtSrvr] ALERT — Node 1: Node 3 Disconnected
    2015-11-18 09:51:05 [MgmtSrvr] ALERT — Node 1: Node 31 Disconnected
    2015-11-18 09:51:05 [MgmtSrvr] INFO — Node 1: Node 2 Connected
    2015-11-18 09:51:05 [MgmtSrvr] INFO — Node 1: Node 31 Connected
    2015-11-18 09:51:07 [MgmtSrvr] INFO — Node 1: Node 3 Connected
    2015-11-18 09:51:07 [MgmtSrvr] INFO — Node 31: Prepare arbitrator node 1
    [ticket=0b2700490bccdebc]
    2015-11-18 09:51:14 [MgmtSrvr] ALERT — Node 1: Node 2 Disconnected
    2015-11-18 09:51:15 [MgmtSrvr] ALERT — Node 1: Node 3 Disconnected
    2015-11-18 09:51:15 [MgmtSrvr] ALERT — Node 1: Node 31 Disconnected
    2015-11-18 09:51:15 [MgmtSrvr] WARNING — Failed to convert connection from
    ‘192.168.10.154:34098’ to transporter: line: 548 : Incorrect state for node 3
    state: does nothing (2)
    2015-11-18 09:51:15 [MgmtSrvr] INFO — Node 1: Node 3 Connected
    2015-11-18 09:51:16 [MgmtSrvr] INFO — Node 1: Node 31 Connected
    2015-11-18 09:51:16 [MgmtSrvr] INFO — Node 1: Node 2 Connected

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