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Posted to issues-all@impala.apache.org by "Michael Ho (JIRA)" <ji...@apache.org> on 2018/11/20 21:50:00 UTC
[jira] [Commented] (IMPALA-4475) Compress ExecPlanFragment before
shipping it to worker nodes to reduce network traffic
[ https://issues.apache.org/jira/browse/IMPALA-4475?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16693818#comment-16693818 ]
Michael Ho commented on IMPALA-4475:
------------------------------------
Whatever is done here will still have benefit even after IMPALA-7467 as we will probably keep the plan and descriptor structures in Thrift for the initial implementation of IMPALA-7467.
> Compress ExecPlanFragment before shipping it to worker nodes to reduce network traffic
> --------------------------------------------------------------------------------------
>
> Key: IMPALA-4475
> URL: https://issues.apache.org/jira/browse/IMPALA-4475
> Project: IMPALA
> Issue Type: New Feature
> Components: Distributed Exec
> Affects Versions: Impala 2.6.0
> Reporter: Mostafa Mokhtar
> Assignee: Vuk Ercegovac
> Priority: Major
> Labels: ramp-up, scalability
> Attachments: count_store_returns.txt.zip, slow_query_start_250K_partitions_134nodes.txt
>
>
> Sending the ExecPlanFragment to remote nodes dominates the query startup time on clusters larger than 100 nodes, size of the ExecPlanFragment grows with number of tables, blocks and partitions in the table.
> On large cluster this is limits query throughput.
> From TPC-DS Q11 on 1K node cluster
> {code}
> Query Timeline: 5m6s
> - Query submitted: 75.256us (75.256us)
> - Planning finished: 1s580ms (1s580ms)
> - Submit for admission: 2s376ms (795.652ms)
> - Completed admission: 2s377ms (1.512ms)
> - Ready to start 15993 fragment instances: 2s458ms (80.378ms)
> - First dynamic filter received: 2m35s (2m33s)
> - All 15993 fragment instances started: 2m35s (40.934ms)
> - Rows available: 4m53s (2m17s)
> - First row fetched: 4m53s (176.254ms)
> - Unregister query: 4m58s (4s828ms)
> - ComputeScanRangeAssignmentTimer: 600.086ms
> {code}
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