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From: Ben Slater <ben.slater@instaclustr.com>
Date: Fri, 10 Jun 2016 04:22:31 +0000
Message-ID: <CAKgYGaocY7CfLVRu0uHd63P=CT2eqPej6fSrEZ+E9yGS-sgRvw@mail.gmail.com>
Subject: Re: Empty snapshot created
To: user@cassandra.apache.org
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archived-at: Fri, 10 Jun 2016 04:22:54 -0000

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After adding a DC you need to run nodetool rebuild. See the procedure here:
https://docs.datastax.com/en/cassandra/2.1/cassandra/operations/ops_add_dc_=
to_cluster_t.html

Cheers
Ben

On Fri, 10 Jun 2016 at 14:17 Mradul Maheshwari <mradul@apporbit.com> wrote:

> Hi,
> I am facing an issue when taking snapshots.
>
> The details of the setup are as follows
>
>    1. Cassandra Version 3.5
>    2. I have a keyspace named *other_map* with '*NetworkTopologyStrategy*=
'
>    and replication factor 1 for 'dc1'
>    3. Added another datacenter 'dc2' in the existing cluster
>    4. Modified  other_map keyspace using the *ALTER* command.
>    5. After this Logged on on the node on dc2 datacenter and issued the *=
nodetool
>    snapshot* command for the other_map keyspace.
>    6. As a result a directory is created in the other_keyspace/<table
>    name>/snapshot/<time-stamp>. This contains only a manifest,json file w=
hich
>    has no information about any files.
>
> <cat content of manifest.json>
> *cat
> data/data/other_map/country-f34a28d02b1511e689afc7a4a4b2ee40/snapshots/14=
65457086678/manifest.json*
>
> *{"files":[]}*
>
> </cat content of manifest.json>
>
> Am I missing any thing here? Are the above mentioned steps complete?
>
> After altering the keyspace I have tried a *nodetool repair* command
> which had also not changed anything.
>
> Regards,
> Mradul
>
>
> Information about schema follows
>
> CREATE KEYSPACE other_map WITH replication =3D {'class':
> 'NetworkTopologyStrategy', 'dc': '1', 'dc2': '2'}  AND durable_writes =3D
> true;
>
> CREATE TABLE other_map.country (
>     id int PRIMARY KEY,
>     name text,
>     states int
> ) WITH bloom_filter_fp_chance =3D 0.01
>     AND caching =3D {'keys': 'ALL', 'rows_per_partition': 'NONE'}
>     AND comment =3D ''
>     AND compaction =3D {'class':
> 'org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy',
> 'max_threshold': '32', 'min_threshold': '4'}
>     AND compression =3D {'chunk_length_in_kb': '64', 'class':
> 'org.apache.cassandra.io.compress.LZ4Compressor'}
>     AND crc_check_chance =3D 1.0
>     AND dclocal_read_repair_chance =3D 0.1
>     AND default_time_to_live =3D 0
>     AND gc_grace_seconds =3D 864000
>     AND max_index_interval =3D 2048
>     AND memtable_flush_period_in_ms =3D 0
>     AND min_index_interval =3D 128
>     AND read_repair_chance =3D 0.0
>     AND speculative_retry =3D '99PERCENTILE';
>
> --
=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94
Ben Slater
Chief Product Officer, Instaclustr
+61 437 929 798

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<div dir=3D"ltr">After adding a DC you need to run nodetool rebuild. See th=
e procedure here:=C2=A0<a href=3D"https://docs.datastax.com/en/cassandra/2.=
1/cassandra/operations/ops_add_dc_to_cluster_t.html">https://docs.datastax.=
com/en/cassandra/2.1/cassandra/operations/ops_add_dc_to_cluster_t.html</a><=
div><br></div><div>Cheers</div><div>Ben</div></div><br><div class=3D"gmail_=
quote"><div dir=3D"ltr">On Fri, 10 Jun 2016 at 14:17 Mradul Maheshwari &lt;=
<a href=3D"mailto:mradul@apporbit.com">mradul@apporbit.com</a>&gt; wrote:<b=
r></div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border=
-left:1px #ccc solid;padding-left:1ex"><div dir=3D"ltr">Hi,<div>I am facing=
 an issue when taking snapshots.</div><div><br></div><div>The details of th=
e setup are as follows</div><div><ol><li>Cassandra Version 3.5</li><li>I ha=
ve a keyspace named <b>other_map</b> with &#39;<b>NetworkTopologyStrategy</=
b>&#39; and replication factor 1 for &#39;dc1&#39;<br></li><li>Added anothe=
r datacenter &#39;dc2&#39; in the existing cluster=C2=A0</li><li>Modified =
=C2=A0other_map keyspace using the <b>ALTER</b> command.</li><li>After this=
 Logged on on the node on dc2 datacenter and issued the <b>nodetool snapsho=
t</b> command for the other_map keyspace.</li><li>As a result a directory i=
s created in the other_keyspace/&lt;table name&gt;/snapshot/&lt;time-stamp&=
gt;. This contains only a manifest,json file which has no information about=
 any files.</li></ol><div><div>&lt;cat content of manifest.json&gt;</div><d=
iv><b>cat data/data/other_map/country-f34a28d02b1511e689afc7a4a4b2ee40/snap=
shots/1465457086678/manifest.json</b></div><div><b><br></b></div><div><b>{&=
quot;files&quot;:[]}</b></div></div></div><div><br></div><div>&lt;/cat cont=
ent of manifest.json&gt;<br></div><div><br></div><div>Am I missing any thin=
g here? Are the above mentioned steps complete?</div><div><br></div><div>Af=
ter altering the keyspace I have tried a <b>nodetool repair</b> command whi=
ch had also not changed anything.</div><div><br></div><div>Regards,</div><d=
iv>Mradul</div><div><br></div><div><br></div><div>Information about schema =
follows</div><div><br></div><div><div>CREATE KEYSPACE other_map WITH replic=
ation =3D {&#39;class&#39;: &#39;NetworkTopologyStrategy&#39;, &#39;dc&#39;=
: &#39;1&#39;, &#39;dc2&#39;: &#39;2&#39;} =C2=A0AND durable_writes =3D tru=
e;</div><div><br></div><div>CREATE TABLE other_map.country (</div><div>=C2=
=A0 =C2=A0 id int PRIMARY KEY,</div><div>=C2=A0 =C2=A0 name text,</div><div=
>=C2=A0 =C2=A0 states int</div><div>) WITH bloom_filter_fp_chance =3D 0.01<=
/div><div>=C2=A0 =C2=A0 AND caching =3D {&#39;keys&#39;: &#39;ALL&#39;, =
9;rows_per_partition&#39;: &#39;NONE&#39;}</div><div>=C2=A0 =C2=A0 AND comm=
ent =3D &#39;&#39;</div><div>=C2=A0 =C2=A0 AND compaction =3D {&#39;class&#=
39;: &#39;org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy&#=
39;, &#39;max_threshold&#39;: &#39;32&#39;, &#39;min_threshold&#39;: &#39;4=
&#39;}</div><div>=C2=A0 =C2=A0 AND compression =3D {&#39;chunk_length_in_kb=
&#39;: &#39;64&#39;, &#39;class&#39;: &#39;org.apache.cassandra.io.compress=
.LZ4Compressor&#39;}</div><div>=C2=A0 =C2=A0 AND crc_check_chance =3D 1.0</=
div><div>=C2=A0 =C2=A0 AND dclocal_read_repair_chance =3D 0.1</div><div>=C2=
=A0 =C2=A0 AND default_time_to_live =3D 0</div><div>=C2=A0 =C2=A0 AND gc_gr=
ace_seconds =3D 864000</div><div>=C2=A0 =C2=A0 AND max_index_interval =3D 2=
048</div><div>=C2=A0 =C2=A0 AND memtable_flush_period_in_ms =3D 0</div><div=
>=C2=A0 =C2=A0 AND min_index_interval =3D 128</div><div>=C2=A0 =C2=A0 AND r=
ead_repair_chance =3D 0.0</div><div>=C2=A0 =C2=A0 AND speculative_retry =3D=
 &#39;99PERCENTILE&#39;;</div></div><div><br></div></div>
</blockquote></div><div dir=3D"ltr">-- <br></div><div data-smartmail=3D"gma=
il_signature"><div dir=3D"ltr">=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=
=94=E2=80=94=E2=80=94=E2=80=94<div>Ben Slater<div>Chief Product Officer, In=
staclustr</div><div>+61 437 929 798</div></div></div></div>

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