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https://issues.apache.org/jira/browse/HDFS-16293?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yuanxin Zhu updated HDFS-16293:
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Summary: Client sleeps and holds 'dataQueue' when DataNodes are congested
(was: Client sleep and hold 'dataQueue' when DataNodes are congested)
> Client sleeps and holds 'dataQueue' when DataNodes are congested
> ----------------------------------------------------------------
>
> Key: HDFS-16293
> URL: https://issues.apache.org/jira/browse/HDFS-16293
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: hdfs-client
> Affects Versions: 3.2.2
> Reporter: Yuanxin Zhu
> Priority: Major
> Original Estimate: 24h
> Remaining Estimate: 24h
>
> When I open the ECN and use Terasort for testing, DataNodes are
> congested(HDFS-8008). The client enters the sleep state after receiving the
> ACK for many times, but does not release the 'dataQueue'. The
> ResponseProcessor thread needs the 'dataQueue' to execute
> 'ackQueue.getFirst()', so the ResponseProcessor will wait for the client to
> release the 'dataQueue', which is equivalent to that the ResponseProcessor
> thread also enters sleep, resulting in ACK delay.MapReduce tasks can be
> delayed by tens of minutes or even hours.
> The DataStreamer thread can first execute 'one = dataQueue. getFirst()',
> release 'dataQueue', and then judge whether to execute 'backOffIfNecessary()'
> according to 'one.isHeartbeatPacket()'
>
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