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From "Vivek Koppuru (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-15866) Split hbase.rpc.timeout into *.read.timeout and *.write.timeout
Date Fri, 22 Jul 2016 17:47:20 GMT

     [ https://issues.apache.org/jira/browse/HBASE-15866?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Vivek Koppuru updated HBASE-15866:
----------------------------------
               Labels: newbie patch  (was: )
    Affects Version/s: 2.0.0
               Status: Patch Available  (was: In Progress)

I split the rpcTimeout in HTable.java into readRpcTimeout and writeRpcTimeout, which can also
go back to the rpcTimeout value that would be set if the user did not configure those values.
Then throughout HTable, whenever making an rpcCallerFactory call, I would pass the appropriate
read/write rpc timeout. I also made a change to the AsyncProcess class constructor to allow
for the use of writeRpcTimeout, which then I made appropriate changes to BufferedMutatorImpl.java,
ConnectionImplementation.java, HTableMultiplexer.java, and TestAsyncProcess.java to account
for this parameter change and passed in the appropriate rpc timeout. Finally, I made sure
I included constants in HConstants.java to retrieve the value of "hbase.rpc.read.timeout"
and "hbase.rpc.write.timeout" and to also allow for fallback to "hbase.rpc.timeout" and the
default rpc timeout if none of those are set. 

> Split hbase.rpc.timeout into *.read.timeout and *.write.timeout
> ---------------------------------------------------------------
>
>                 Key: HBASE-15866
>                 URL: https://issues.apache.org/jira/browse/HBASE-15866
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 2.0.0
>            Reporter: Andrew Purtell
>            Assignee: Vivek Koppuru
>              Labels: newbie, patch
>             Fix For: 2.0.0
>
>         Attachments: read-write-rpc-timeouts.patch
>
>
> We have a single tunable for the RPC timeout interval - hbase.rpc.timeout. This is fine
for the general case but there are use cases where it would be advantageous to set two separate
timeouts for reads (gets, scans, perhaps with significant server side filtering - although
the new scanner heartbeat feature mitigates where available) and mutations (fail fast under
tight SLA, resubmit or take mitigating action). 
> I propose we refer to a configuration setting "hbase.rpc.read.timeout" when handling
read operations and "hbase.rpc.write.timeout" when handling write operations. If those values
are not set in the configuration, fall back to the value of "hbase.rpc.timeout" or its default.

> So for example in HTable instead of one global timeout for each RPC (rpcTimeout), there
would be a readRpcTimeout and writeRpcTimeout also set up in HTable#finishSetup. Then wherever
we set up RPC with RpcRetryingCallerFactory#newCaller(int rpcTimeout) we pass in the read
or write timeout depending on what the op is.
> In general I don't like the idea of adding configuration parameters to our already heavyweight
set, but I think the inability to control timeouts separately for reads and writes is an operational
deficit.
> See also PHOENIX-2916.



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