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From Ben Slater <ben.sla...@instaclustr.com>
Subject Re: Empty snapshot created
Date Fri, 10 Jun 2016 04:22:31 GMT
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 which
>    has no information about any files.
>
> <cat content of manifest.json>
> *cat
> data/data/other_map/country-f34a28d02b1511e689afc7a4a4b2ee40/snapshots/1465457086678/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 = {'class':
> 'NetworkTopologyStrategy', 'dc': '1', 'dc2': '2'}  AND durable_writes =
> true;
>
> CREATE TABLE other_map.country (
>     id int PRIMARY KEY,
>     name text,
>     states int
> ) WITH bloom_filter_fp_chance = 0.01
>     AND caching = {'keys': 'ALL', 'rows_per_partition': 'NONE'}
>     AND comment = ''
>     AND compaction = {'class':
> 'org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy',
> 'max_threshold': '32', 'min_threshold': '4'}
>     AND compression = {'chunk_length_in_kb': '64', 'class':
> 'org.apache.cassandra.io.compress.LZ4Compressor'}
>     AND crc_check_chance = 1.0
>     AND dclocal_read_repair_chance = 0.1
>     AND default_time_to_live = 0
>     AND gc_grace_seconds = 864000
>     AND max_index_interval = 2048
>     AND memtable_flush_period_in_ms = 0
>     AND min_index_interval = 128
>     AND read_repair_chance = 0.0
>     AND speculative_retry = '99PERCENTILE';
>
> --
————————
Ben Slater
Chief Product Officer, Instaclustr
+61 437 929 798

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