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From "Liang Xie (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-11359) A simple request timeout interrupt mechanism in HBase server side
Date Mon, 16 Jun 2014 08:06:01 GMT
Liang Xie created HBASE-11359:
---------------------------------

             Summary: A simple request timeout interrupt mechanism in HBase server side
                 Key: HBASE-11359
                 URL: https://issues.apache.org/jira/browse/HBASE-11359
             Project: HBase
          Issue Type: Improvement
          Components: regionserver
    Affects Versions: 0.94.20, 0.99.0
            Reporter: Liang Xie


we had introduced a fail fast mechanism in RPC layer, see HBASE-10506.
But still, a slow latency problem comes from lower HDFS layer could make all HBase handler
threads slow, sometimes those handler could hang several seconds. it's meanlingless to continue
processing those read/write requests in the valuable rpc handler threads, especially the ones
need to do a costly physical read operation or networking activity(write pipeline). A better
solution should be similar with twitter MySQL branch: statement-timeout feature. I haven't
taken time on figure out weather it's need to break compatibility or not in master, we are
using a 0.94 branch, to me it will break if i adding a operation timeout field in every client
rpc request.
so i added a simpler patch using the existing "rpcCall.throwExceptionIfCallerDisconnected()",
instrumenting it just before HLog sync and  DFSInputStream read/pread (@readAtOffset). 



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