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From "Paul Rogers (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DRILL-4543) Advertise Drill-bit ports, status, capabilities in ZooKeeper
Date Tue, 29 Mar 2016 18:11:25 GMT

    [ https://issues.apache.org/jira/browse/DRILL-4543?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15216522#comment-15216522
] 

Paul Rogers commented on DRILL-4543:
------------------------------------

Great idea! Perhaps generalize this to a configuration stack:

* System properties (-DpropName=value)
* Env var: DRILL_PROP_NAME=value
* Drill site config: "propName": "value"
* Defaults

The idea is that items higher in order take precedence over items lower in the order. Mesos
can override values with env vars. YARN can use either env vars or command-like args (-D...).

Then, when the values are needed by other Drill-bits, this particular Drill-bit uses ZK to
advertise its actual values as computed using the override rules. YARN (or Mesos) can adjust
ports and resources, and other Drill-bits can learn of those customizations.

> Advertise Drill-bit ports, status, capabilities in ZooKeeper
> ------------------------------------------------------------
>
>                 Key: DRILL-4543
>                 URL: https://issues.apache.org/jira/browse/DRILL-4543
>             Project: Apache Drill
>          Issue Type: Improvement
>          Components:  Server
>            Reporter: Paul Rogers
>             Fix For: 2.0.0
>
>
> Today Drill uses ZooKeeper (ZK) to advertise the existence of a Drill-bit, providing
just the host name/IP Address of the Drill-bit. All other information (ports, status, capabilities)
are assumed to be the same across all Drill-bits in the cluster as specified in the Drill
config file.
> Moving forward, as Drill becomes more sophisticated, Drill should advertise the specifics
of each Drill-bit so that one Drill bit can differ from another.
> For example, when running on YARN, we need a way for Drill to gracefully shut down. Advertising
a status of Ready or Unavailable will help. Ready is the normal state. Unavailable means the
Drill-bit will finish in-flight queries, but won't accept new ones. (The actual status is
a separate enhancement.)
> In a YARN cluster, Drill should take advantage of machines with more memory, but live
with machines with less. (Perhaps some are newer, some are older or more heavily loaded.)
Drill should use ZK to identify its available memory and CPUs so that the planner can use
them. (Use of the info is a separate enhancement.)
> There may be times when two drill bits run on a single machine. If so, they must use
separate ports. So, each Drill-bit should advertise its ports in ZK.
> For backward compatibility, the information is optional; if not present, the receiver
should assume the information defaults to that in the config file.



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