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From: Saurabh Sethi <Saurabh_Sethi@symantec.com>
To: "user@cassandra.apache.org" <user@cassandra.apache.org>
Date: Tue, 31 Mar 2015 14:59:21 -0700
Subject: Re: Column value not getting updated
Thread-Topic: Column value not getting updated
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That=92s what I found out that the clocks were not in sync.

But I have setup NTP on all 3 nodes and would expect the clocks to be in sy=
nc.

From: Nate McCall <nate@thelastpickle.com<mailto:nate@thelastpickle.com>>
Reply-To: "user@cassandra.apache.org<mailto:user@cassandra.apache.org>" <us=
er@cassandra.apache.org<mailto:user@cassandra.apache.org>>
Date: Tuesday, March 31, 2015 at 2:50 PM
To: Cassandra Users <user@cassandra.apache.org<mailto:user@cassandra.apache=
.org>>
Subject: Re: Column value not getting updated

You would see that if the servers' clocks were out of sync.

Make sure the time on the servers is in sync or set the client timestamps e=
xplicitly.

On Tue, Mar 31, 2015 at 3:23 PM, Saurabh Sethi <Saurabh_Sethi@symantec.com<=
mailto:Saurabh_Sethi@symantec.com>> wrote:
I have written a unit test that creates a column family, inserts a row in t=
hat column family and then updates the value of one of the columns.

After updating, unit test immediately tries to read the updated value for t=
hat column, but Cassandra returns the old value.

 *   I am using QueryBuilder API and not CQL directly.
 *   I am using the consistency level of QUORUM for everything =96 insert, =
update and read.
 *   Cassandra is running as a 3 node cluster with replication factor of 3.

Anyone has any idea what is going on here?

Thanks,
Saurabh


--
-----------------
Nate McCall
Austin, TX
@zznate

Co-Founder & Sr. Technical Consultant
Apache Cassandra Consulting
http://www.thelastpickle.com

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<html><head>
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3DWindows-1=
252"></head><body style=3D"word-wrap: break-word; -webkit-nbsp-mode: space;=
 -webkit-line-break: after-white-space; color: rgb(0, 0, 0); font-size: 14p=
x; font-family: Calibri, sans-serif;"><div>That=92s what I found out that t=
he clocks were not in sync.</div><div><br></div><div>But I have setup NTP o=
n all 3 nodes and would expect the clocks to be in sync.</div><div><br></di=
v><span id=3D"OLK_SRC_BODY_SECTION"><div style=3D"font-family:Calibri; font=
-size:11pt; text-align:left; color:black; BORDER-BOTTOM: medium none; BORDE=
R-LEFT: medium none; PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; PADDING-RIGHT:=
 0in; BORDER-TOP: #b5c4df 1pt solid; BORDER-RIGHT: medium none; PADDING-TOP=
: 3pt"><span style=3D"font-weight:bold">From: </span> Nate McCall &lt;<a hr=
ef=3D"mailto:nate@thelastpickle.com">nate@thelastpickle.com</a>&gt;<br><spa=
n style=3D"font-weight:bold">Reply-To: </span> &quot;<a href=3D"mailto:user=
@cassandra.apache.org">user@cassandra.apache.org</a>&quot; &lt;<a href=3D"m=
ailto:user@cassandra.apache.org">user@cassandra.apache.org</a>&gt;<br><span=
 style=3D"font-weight:bold">Date: </span> Tuesday, March 31, 2015 at 2:50 P=
M<br><span style=3D"font-weight:bold">To: </span> Cassandra Users &lt;<a hr=
ef=3D"mailto:user@cassandra.apache.org">user@cassandra.apache.org</a>&gt;<b=
r><span style=3D"font-weight:bold">Subject: </span> Re: Column value not ge=
tting updated<br></div><div><br></div><div dir=3D"ltr"><div>You would see t=
hat if the servers' clocks were out of sync.&nbsp;</div><div><br></div>Make=
 sure the time on the servers is in sync or set the client timestamps expli=
citly.&nbsp;</div><div class=3D"gmail_extra"><br><div class=3D"gmail_quote"=
>On Tue, Mar 31, 2015 at 3:23 PM, Saurabh Sethi <span dir=3D"ltr">&lt;<a hr=
ef=3D"mailto:Saurabh_Sethi@symantec.com" target=3D"_blank">Saurabh_Sethi@sy=
mantec.com</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_quote" style=
=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div sty=
le=3D"word-wrap:break-word;color:rgb(0,0,0);font-size:14px;font-family:Cali=
bri,sans-serif"><div>I have written a unit test that creates a column famil=
y, inserts a row in that column family and then updates the value of one of=
 the columns.</div><div><br></div><div>After updating, unit test immediatel=
y tries to read the updated value for that column, but Cassandra returns th=
e old value.</div><ul><li>I am using QueryBuilder API and not CQL directly.=
</li><li>I am using the consistency level of QUORUM for everything =96 inse=
rt, update and read.</li><li>Cassandra is running as a 3 node cluster with =
replication factor of 3.</li></ul><div><br></div><div>Anyone has any idea w=
hat is going on here?</div><div><br></div><div>Thanks,</div><div>Saurabh</d=
iv></div></blockquote></div><br><br clear=3D"all"><div><br></div>-- <br><di=
v class=3D"gmail_signature"><div dir=3D"ltr">-----------------<br>Nate McCa=
ll<br>Austin, TX<br>@zznate<br><br>Co-Founder &amp; Sr. Technical Consultan=
t<br>Apache Cassandra Consulting<br><a href=3D"http://www.thelastpickle.com=
" target=3D"_blank">http://www.thelastpickle.com</a></div></div></div></spa=
n></body></html>

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