Woooweeeee!
Now that we've got all of our servers up and running, let's take a minute to
assign them all their official roles.
Summary of what we've got:
analytics1001 - analytics1010:
Cisco UCS C250 M1
192G RAM
8 x 300G = 2.4T
24 core X5650 @ 2.67 GHz
analytics1011 - analytics1022:
Dell Poweredge R720
48G RAM
12 * 2T = 24T
12 core EW-2620 @ 2.00GHz
analytics1023 - analytics1027:
Dell PowerEdge R310
8G RAM
2 * 1G = 2G
4 core X3430 @ 2.40GHz
an11 - an22 are easy. They should be Hadoop Worker (HDFS) nodes, since they have so much
storage space!
an23-an27 are relative weakling and should not be used for compute or data needs.
I've currently got Zookeepers running on an23, an24 and an25 (we need 3 for a quorum),
and I think we should keep it that way.
The remaining assignments require more discussion. Our NameNode is currently on an01, but
as Diederik pointed out last week, this is a bit of a waste of a node, since it is so
beefy. I'd like to suggest that we use an26 and an27 for NameNode and backup
NameNode.
My rudimentary Snappy compression test reduces web access log files to about 33% of there
original size. According the the unsampled file we saved back in August, uncompressed web
request logs generate about 100 GB / hour. Rounded (way) up, that's 20 TB / week.
If we snappy compress and do more rounding up, that's 7 TB / week*.
an11, an12: Kafka Brokers
I had wanted to use all of the R720s as hadoop workers, but we'd like to be able to
store a week's worth of Kafka log buffer. There isn't enough storage space on the
other machines to do this, so I think we should use two of these as Kafka brokers. If we
RAID 1 the buffer drives (which we probably should), that makes the Kafka buffer 10 TB (2
nodes * 10 2 TB drives / 2 (for RAID)), which should be enough to cover us for a while.
an01 - an10: Storm/ETL
These are beefy (tons of RAM, 24 core), so these will be good for hefty realtime stuff.
We could also take a few of these and use them as Hadoop workers, but since they don't
really have that much space to add to the HDFS pool, I'm not sure if it is worth it.
an23, an25: ZooKeepers
As I said above, let's keep the ZKs here.
an26, an27: Hadoop Masters
Move the NameNodes (primary and secondary/failover) here.
an13 - an22: Hadoop Workers
We need to use the first 2 drives in RAID 1 for the OS, so really we only have 10 drives
for HDFS space. Still, that gives us 200 TB. With an HDFS replication factor of 3,
that's 67 TB HDFS.
Thoughts? Since we'll def want to use an13-an22 as workers, I'll start spawning
those up and adding them to the cluster today. Yeehaw!
-Ao
*For the sake of simplicity, I'm not counting other input sources (event log, sqoop,
etc.), and instead hoping that rounding up as much as I did will cover these needs.