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Re: Remote vs Local metastore for hive
Hi Ranjith,
Your understanding is correct.

I going to answer your 2nd question here. I would say if you don't have a lot of concurrent users using Hive (and hence, the metastore) at the same time, local relational DB (like MySQL) would work well as your metastore.

If you have more concurrent connections to a Hive metastore, consider using a remote metastore. "More" is relative here, but my guess would be "more" means more than several tens of users at the same time.


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----- Original Message -----
From: "Ranjith Raghunath" <[EMAIL PROTECTED]>
Sent: Wednesday, March 7, 2012 11:35:49 PM
Subject: Remote vs Local metastore for hive
I trying to understand this concept a little better and could use some help from the larger community. I jotted down a couple of quick notes as I was reading through the material of local vs remote:

1. In local mode, each hive client will invoke a connection to the database. If there are several clients connected to the database this could overwhelm the instance depending on the max connection parameter set. By default, this value is set at 151 (in MySQL) and can be bumped up to large value depending on how much ram the box has.

2. In remote mode, each of the clients go through the metastore service.

The question here is:

1. Can each node on the cluster have a separate metastore service when using the remote metastore configuration?

a. If so managing this seems like a nightmare in terms of keeping the logs in sync.

b. This seems to be like a single point of failure as all connections are routed through a metastore service.

2. What is preferred approach here with respect to local vs remote?

3. In order to avoid overwhelming the database should the following parameters be tuned:

a. hive.metastore.server.min.threads

b. hive.metastore.server.max.threads