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Subject: Question about the QJM HA namenode
Message-Id: <1B699136-87C4-4E37-B752-9F707A9422E8@gmail.com>
Date: Wed, 3 Dec 2014 14:48:20 +0800
To: user@hadoop.apache.org
Mime-Version: 1.0 (Mac OS X Mail 7.3 \(1878.6\))

Hi all,

I deploy the hadoop with 3 machines:

l-hbase1.dba.dev.cn0 (namenode active and QJM)
l-hbase2.dba.dev.cn0 (namenode standby and datanode and QJM)
l-hbase3.dba.dev.cn0 (datanode and QJM)

Above the hadoop, i deploy a hbase:
l-hbase1.dba.dev.cn0 (HMaster active)
l-hbase2.dba.dev.cn0 (HMaster standby)
l-hbase3.dba.dev.cn0 (RegionServer)


I write a program which put data into hbase one row every seconds in a =
loop.=20
Then I use iptables to  simulate l-hbase1.dba.dev.cn0 offline=EF=BC=8Cand =
after that , the program hang and can not=20
write to hbase. After about 15 mins, the program can write again.

The time 15mins for the HA failover is too long for me!
And I=E2=80=99ve no idea about the reason.

Then I check the l-hbase2.dba.dev.cn0 namenode logs, and find many retry =
like below:
{code}
2014-12-03 12:13:35,165 INFO org.apache.hadoop.ipc.Client: Retrying =
connect to server: l-hbase1.dba.dev.cn0/10.86.36.217:8485. Already tried =
1 time(s); retry policy is =
RetryUpToMaximumCountWithFixedSleep(maxRetries=3D10, sleepTime=3D1000 =
MILLISECONDS)=20
{code}

I have the QJM on l-hbase1.dba.dev.cn0, does it matter?

I am a newbie, Any idea will be appreciated!!=