Haven't found time, yet. :(
Are you bouncing just HBase or Zookeeper as well? I found the ZK client to be frequently the main source delay for "reconnecting". (note also that if run HBase in local mode it will manage ZK for you as well, and the ZK port might change upon restart, which the client does not handle well) -- Lars ________________________________ From: Kristoffer Sjögren <[email protected]> To: [email protected] Sent: Wednesday, February 12, 2014 11:54 PM Subject: Re: Standard vs Asynchbase client reconnect after HBase restart @Ted We are using HBase 0.94.6 from CDH 4 to be exact. @Lars Thanks a lot! @Mike Just to be clear - the test is using HConnection [1] and HBaseClient [2] which is what I refer to as the 'client'. With 'recovered' I mean that the client has gone from 'unresponsive' to being able query and insert data into HBase. 1. http://hbase.apache.org/0.94/apidocs/org/apache/hadoop/hbase/client/HConnection.html 2. http://tsunanet.net/~tsuna/asynchbase/api/org/hbase/async/HBaseClient.html On Thu, Feb 13, 2014 at 1:11 AM, Michael Segel <[email protected]>wrote: > Silly question... > What makes you think that what you are seeing isn't already as fast as > possible? > > You are looking at an async client versus a synchronous client, right? > > Also... what do you mean when you say 'client recovers' ... > How are you measuring that the client has recovered? > > Thx > > -Mike > > > On Feb 12, 2014, at 2:41 AM, Kristoffer Sjögren <[email protected]> wrote: > > > Hi > > > > I have some tests that check client behaviour during a controlled HBase > > restart. Everything works as expected and the client is able to recover > > after a while. > > > > However, after doing the same tests with the Asynchbase I noticed that > this > > client recovers almost instantly after HBase comes back up - whereas the > > standard HConnection recovers much later (around 30 seconds). > > > > I played around with two properties without much time to recovery > reduction. > > > > fail.fast.expired.active.master=true > > zookeeper.session.timeout=5000 > > > > Any tips on how to improve time to recovery? > > > > Cheers, > > -Kristoffer > > The opinions expressed here are mine, while they may reflect a cognitive > thought, that is purely accidental. > Use at your own risk. > Michael Segel > michael_segel (AT) hotmail.com > > > > > >
