[jira] [Created] (KUDU-1616) Client should cache non-existence of a table

["Todd Lipcon (JIRA)" <ji...@apache.org>]

Todd Lipcon created KUDU-1616:
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             Summary: Client should cache non-existence of a table
                 Key: KUDU-1616
                 URL: https://issues.apache.org/jira/browse/KUDU-1616
             Project: Kudu
          Issue Type: Bug
          Components: client
    Affects Versions: 1.0.0
            Reporter: Todd Lipcon


I was running YCSB and dropped the table without stopping the client. The load on the master quickly shot up because the client was getting "not found" errors and trying to query the master for locations. Every op was immediately failing, but because YCSB doesn't exit on failure, it kept generating new ops at the same rate that the master could reject the location requests. This resulted in 50k+/sec RPC/sec against the master.

The master didn't fall over, but if there were a lot of clients sending 50k/sec in a larger cluster, we'd probably start impacting requests against good tables.

To solve this, the client should have a negative cache of deleted table ids.



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