Solved. FYI, in my case (even though I still dont understand the reason) I had to drop the external table I was using to create my new table, and recreate it, that way I stopped getting the 4k limititation error. So, updating serde_params and columns_v2 was enough, I went with mediumtext.
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I've found that earlier today and followed the steps, even though the web UI doesn't make it clear that any extra steps are necessary. Also, the "add the snippets" interface appears to have changed, so it took a minute to find what I was looking for there. It breaks at point 11 of Step 5. I'm starting from a vanilla, unmodified 5.8 Quickstart VM (Virtualbox flavour). I'd assumed it would be correctly configured to add things like Accumulo, and I'm fairly sure it defaults to packages (RPMs). OS and versions are whatever Cloudera makes available - the VM appears to be CentOS6 and I'll be installing whatever version of Accumulo the public repos have available each time I installed over the past two days (I'm connected to the Internet and downloading packages). I've had a look in the logs, but the only mention of "csd.sh" is an error from earlier on when I first found that Accumulo service deployment wasn't creating the "accumulo" user. The VM is provisioned with two CPUs and 16GB RAM. Could the problem be because I'm using a single Quickstart VM and trying to install all services on one node? I'd rather not try to set up a network and multiple VMs just for some simple tests and experimentation. Thanks.
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