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https://issues.apache.org/jira/browse/AVRO-782?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13007769#comment-13007769
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ey-chih chow commented on AVRO-782:
-----------------------------------
We run this patch under avro 1.5 with the fix of the bug avro-780.
> issue of cache coherence or reuse for avro map reduce
> -----------------------------------------------------
>
> Key: AVRO-782
> URL: https://issues.apache.org/jira/browse/AVRO-782
> Project: Avro
> Issue Type: Bug
> Components: java
> Affects Versions: 1.5.0
> Environment: Mac with VMWare running Linux training-vm
> 2.6.28-19-server #61-Ubuntu
> Reporter: ey-chih chow
> Attachments: AVRO-782.patch
>
> Original Estimate: 168h
> Remaining Estimate: 168h
>
> Our map reduce jobs are using Avro map/reduce API. For one of the jobs, we
> got the following trace for the reducer:
> ====================================================================================================
> attempt_20110310145147365_0002_r_000000_0/syslog:2011-03-10 14:52:31,226 INFO
> com.ngmoco.ngpipes.sourcing.NgActivityGatheringReducer: working on
> 0000000000000000000000000000000000000 whose rowKey is
> 0000000000000000000000000000000000000
> attempt_20110310145315542_0002_r_000000_0/syslog:2011-03-10 14:53:59,010 INFO
> com.ngmoco.ngpipes.sourcing.NgActivityGatheringReducer: working on
> 0000000000000000000000000000000000000 whose rowKey is
> 0000000000000000000000000000000000000
> attempt_20110310145315542_0002_r_000000_0/syslog:2011-03-10 14:53:59,016 INFO
> com.ngmoco.ngpipes.sourcing.NgActivityGatheringReducer: working on
> 0000000100000000000000000000000000001 whose rowKey is
> 0000000200000000000000000000000000002
> attempt_20110310145315542_0002_r_000000_0/syslog:2011-03-10 14:53:59,017 INFO
> com.ngmoco.ngpipes.sourcing.NgActivityGatheringReducer: working on
> 0000000200000000000000000000000000002 whose rowKey is
> 0000000300000000000000000000000000003
> attempt_20110310145315542_0002_r_000000_0/syslog:2011-03-10 14:53:59,021 INFO
> com.ngmoco.ngpipes.sourcing.NgActivityGatheringReducer: working on
> 0000000300000000000000000000000000003 whose rowKey is
> 0000000400000000000000000000000000004
> attempt_20110310145315542_0002_r_000000_0/syslog:2011-03-10 14:53:59,023 INFO
> com.ngmoco.ngpipes.sourcing.NgActivityGatheringReducer: working on
> 0000000400000000000000000000000000004 whose rowKey is
> 0000000500000000000000000000000000005
> attempt_20110310145315542_0002_r_000000_0/syslog:2011-03-10 14:53:59,024 INFO
> com.ngmoco.ngpipes.sourcing.NgActivityGatheringReducer: working on
> 0000000500000000000000000000000000005 whose rowKey is
> 0000000500000000000000000000000000005
> ====================================================================================================
> If we add the following two lines to the reducer code:
> ====================================================================================================
> boolean workAround =
> getConf().getBoolean(NgActivityGatheringJob.NG_AVRO_BUG_WORKAROUND, true);
> Utf8 dupKey = (workAround) ? new Utf8(key.toString()) : key; // use dupKey
> instead of key passed to reducer
> ====================================================================================================
> We got the following trace, which we consider as the right behavior:
> ====================================================================================================
> 2011-03-10 15:04:33,431 INFO
> com.ngmoco.ngpipes.sourcing.NgActivityGatheringReducer: working on
> 0000000000000000000000000000000000000 whose rowKey is
> 0000000000000000000000000000000000000
> attempt_20110310150517897_0002_r_000000_0/syslog:2011-03-10 15:06:01,374 INFO
> com.ngmoco.ngpipes.sourcing.NgActivityGatheringReducer: working on
> 0000000000000000000000000000000000000 whose rowKey is
> 0000000000000000000000000000000000000
> attempt_20110310150517897_0002_r_000000_0/syslog:2011-03-10 15:06:01,381 INFO
> com.ngmoco.ngpipes.sourcing.NgActivityGatheringReducer: working on
> 0000000100000000000000000000000000001 whose rowKey is
> 0000000100000000000000000000000000001
> attempt_20110310150517897_0002_r_000000_0/syslog:2011-03-10 15:06:01,383 INFO
> com.ngmoco.ngpipes.sourcing.NgActivityGatheringReducer: working on
> 0000000200000000000000000000000000002 whose rowKey is
> 0000000200000000000000000000000000002
> attempt_20110310150517897_0002_r_000000_0/syslog:2011-03-10 15:06:01,389 INFO
> com.ngmoco.ngpipes.sourcing.NgActivityGatheringReducer: working on
> 0000000300000000000000000000000000003 whose rowKey is
> 0000000300000000000000000000000000003
> attempt_20110310150517897_0002_r_000000_0/syslog:2011-03-10 15:06:01,391 INFO
> com.ngmoco.ngpipes.sourcing.NgActivityGatheringReducer: working on
> 0000000400000000000000000000000000004 whose rowKey is
> 0000000400000000000000000000000000004
> attempt_20110310150517897_0002_r_000000_0/syslog:2011-03-10 15:06:01,393 INFO
> com.ngmoco.ngpipes.sourcing.NgActivityGatheringReducer: working on
> 0000000500000000000000000000000000005 whose rowKey is
> 0000000500000000000000000000000000005
> ====================================================================================================
> According to Scott Carey, this might relate to object reuse. We have created
> an Unit test case that will reproduce the problem. The test case will be
> attached as a patch. Note that we run this test case under our Ngmoco dev
> environment, which might need to make some adjustment to run on other
> environment.
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