Where am I wasting my memory for n1ql index?

N1QL
1

Hello,

When I look at the server and check memory usage with “top” command, indexer process is using 60% memory.
We’ve assigned 12GB for “Index RAM Quota”.

We have two index servers and I have the following indexes on one of the servers. This server is comsuming 60% of the system memory by “indexer” process. How is it using 60%? I don’t even have 2 GB indexes in this particular server.

idx_attr_form
    disk size: 12.2 MB
    data size: 217 KB
idx_c_client
    disk size: 1.86 GB
    data size: 842 MB
idx_p_type_client
    disk size: 17.2 MB
    data size: 220 KB
idx_p_type_id
    disk size: 17.2 MB
    data size: 219 KB
idx_p_type_slug
    disk size: 17.2 MB
    data size: 220 KB
2

@moon0326, which couchbase version are you using and what is the storage type(standard or memory optimized)?

3

We are one 4.5.1 and standard memory.

4

Can you run the below 2 curl command on index service node and share the output

curl <host>:9102/stats -u <username:password>
curl <host>:9102/stats/mem -u <username:password>
5

stats

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mem

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Thanks!

6

Indexer is reporting memory usage of 3.5GB(2.5 in storage and rest in overheads/temporary allocations).

I see 9.5GB of heap released back to OS by golang. golang is not aggressive in releasing memory back to OS. That may have lead to higher peak usage. Do you still see 60% usage reported by top?

7

Thank you @deepkaran.salooja

Yeah, it is still reporting 60.3%. It’s been at least a couple of days as far as I know.

Thanks,
Moon

8

With standard index, the storage buffer cache is allocated in full at the start of the process. @deepkaran.salooja does this not explain the memory usage? If you would like memory to grow in line with usage, and your use case fits all-in-memory constraint, you could use Memory Optimized Index mode.

9

@siri, full storage buffer cache allocation at the start was in 4.0.x. With 4.5.x, the buffer cache is allocated on demand. The storage buffer cache is being reported as 2.5GB here. We have a pending improvement MB-19895 to report all memory usage statistics from storage. I guess storage memory usage outside of buffer cache is the cause here as everything else is already accounted for.

I agree that Memory Optimized mode is preferred for predictable memory usage.

10

Thank you both @siri @deepkaran.salooja.

@deepkaran.salooja Is there anything I can do to free the memory at this point? The server is still at 60% and it’s not going up or down. I’m not sure if it is normal if it stays for over 4+ days without a reason.

Do you think this is related to OOM issue with indexer?

We had a few of these…

[user:info,2016-10-12T19:24:58.702Z,ns_1@xxx:<0.964.0>:ns_log:crash_consumption_loop:70]Service 'indexer' exited with status 1. Restarting. Messages: fatal error: runtime: out of memory

And we still don’t know why it was killed (why it was out of memory when there were plenty)

11

@moon0326, you can try to kill the indexer process on the node(it will restart on its own) and see if the memory gets released. That’s not the solution but it will help us get an idea if it is being leaked. Please run the above two curl commands before and after killing(once the process is up and all indexes are back online). Also capture the corresponding ‘top’ output for the indexer process.

12

Hi @deepkaran.salooja

Thank you for the suggestions.

Unfortunately, we updated our server to use memory optimized index a few days. It works much better than standard.

It looks like the issues we had before (out of memory) are related to this issue.

13

@moon0326, good to hear that you switched to memory optimized indexes. Do let us know if you face any issues with it.