docs/topics/impala_live_summary.xml - impala - Git at Google

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 <!DOCTYPE concept PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
 <concept rev="2.3.0" id="live_summary">

   <title>LIVE_SUMMARY Query Option (<keyword keyref="impala23"/> or higher only)</title>
   <titlealts audience="PDF"><navtitle>LIVE_SUMMARY</navtitle></titlealts>
   <prolog>
     <metadata>
       <data name="Category" value="Impala"/>
       <data name="Category" value="Impala Query Options"/>
       <data name="Category" value="Querying"/>
       <data name="Category" value="Performance"/>
       <data name="Category" value="Reports"/>
       <data name="Category" value="impala-shell"/>
       <data name="Category" value="Developers"/>
       <data name="Category" value="Data Analysts"/>
     </metadata>
   </prolog>

   <conbody>

     <p rev="2.3.0">
       <indexterm audience="hidden">LIVE_SUMMARY query option</indexterm>
       For queries submitted through the <cmdname>impala-shell</cmdname> command,
       displays the same output as the <codeph>SUMMARY</codeph> command,
       with the measurements updated in real time as the query progresses.
       When the query finishes, the final <codeph>SUMMARY</codeph> output remains
       visible in the <cmdname>impala-shell</cmdname> console output.
     </p>

     <p>
     </p>

     <p conref="../shared/impala_common.xml#common/type_boolean"/>
     <p conref="../shared/impala_common.xml#common/default_false_0"/>

     <p conref="../shared/impala_common.xml#common/command_line_blurb"/>
     <p>
       You can enable this query option within <cmdname>impala-shell</cmdname>
       by starting the shell with the <codeph>--live_summary</codeph>
       command-line option.
       You can still turn this setting off and on again within the shell through the
       <codeph>SET</codeph> command.
     </p>

     <p conref="../shared/impala_common.xml#common/usage_notes_blurb"/>
     <p>
       The live summary output can be useful for evaluating long-running queries,
       to evaluate which phase of execution takes up the most time, or if some hosts
       take much longer than others for certain operations, dragging overall performance down.
       By making the information available in real time, this feature lets you decide what
       action to take even before you cancel a query that is taking much longer than normal.
     </p>
     <p>
       For example, you might see the HDFS scan phase taking a long time, and therefore revisit
       performance-related aspects of your schema design such as constructing a partitioned table,
       switching to the Parquet file format, running the <codeph>COMPUTE STATS</codeph> statement
       for the table, and so on.
       Or you might see a wide variation between the average and maximum times for all hosts to
       perform some phase of the query, and therefore investigate if one particular host
       needed more memory or was experiencing a network problem.
     </p>
     <p conref="../shared/impala_common.xml#common/live_reporting_details"/>
     <p>
       For a simple and concise way of tracking the progress of an interactive query, see
       <xref href="impala_live_progress.xml#live_progress"/>.
     </p>

     <p conref="../shared/impala_common.xml#common/restrictions_blurb"/>
     <p conref="../shared/impala_common.xml#common/impala_shell_progress_reports_compute_stats_caveat"/>
     <p conref="../shared/impala_common.xml#common/impala_shell_progress_reports_shell_only_caveat"/>

     <p conref="../shared/impala_common.xml#common/added_in_230"/>

     <p conref="../shared/impala_common.xml#common/example_blurb"/>

     <p>
       The following example shows a series of <codeph>LIVE_SUMMARY</codeph> reports that
       are displayed during the course of a query, showing how the numbers increase to
       show the progress of different phases of the distributed query. When you do the same
       in <cmdname>impala-shell</cmdname>, only a single report is displayed at any one time,
       with each update overwriting the previous numbers.
     </p>

 <codeblock><![CDATA[[localhost:21000] > set live_summary=true;
 LIVE_SUMMARY set to true
 [localhost:21000] > select count(*) from customer t1 cross join customer t2;
 +---------------------+--------+----------+----------+---------+------------+----------+---------------+-----------------------+
 | Operator            | #Hosts | Avg Time | Max Time | #Rows   | Est. #Rows | Peak Mem | Est. Peak Mem | Detail                |
 +---------------------+--------+----------+----------+---------+------------+----------+---------------+-----------------------+
 | 06:AGGREGATE        | 0      | 0ns      | 0ns      | 0       | 1          | 0 B      | -1 B          | FINALIZE              |
 | 05:EXCHANGE         | 0      | 0ns      | 0ns      | 0       | 1          | 0 B      | -1 B          | UNPARTITIONED         |
 | 03:AGGREGATE        | 0      | 0ns      | 0ns      | 0       | 1          | 0 B      | 10.00 MB      |                       |
 | 02:NESTED LOOP JOIN | 0      | 0ns      | 0ns      | 0       | 22.50B     | 0 B      | 0 B           | CROSS JOIN, BROADCAST |
 | |--04:EXCHANGE      | 0      | 0ns      | 0ns      | 0       | 150.00K    | 0 B      | 0 B           | BROADCAST             |
 | |  01:SCAN HDFS     | 1      | 503.57ms | 503.57ms | 150.00K | 150.00K    | 24.09 MB | 64.00 MB      | tpch.customer t2      |
 | 00:SCAN HDFS        | 0      | 0ns      | 0ns      | 0       | 150.00K    | 0 B      | 64.00 MB      | tpch.customer t1      |
 +---------------------+--------+----------+----------+---------+------------+----------+---------------+-----------------------+

 +---------------------+--------+----------+----------+---------+------------+----------+---------------+-----------------------+
 | Operator            | #Hosts | Avg Time | Max Time | #Rows   | Est. #Rows | Peak Mem | Est. Peak Mem | Detail                |
 +---------------------+--------+----------+----------+---------+------------+----------+---------------+-----------------------+
 | 06:AGGREGATE        | 0      | 0ns      | 0ns      | 0       | 1          | 0 B      | -1 B          | FINALIZE              |
 | 05:EXCHANGE         | 0      | 0ns      | 0ns      | 0       | 1          | 0 B      | -1 B          | UNPARTITIONED         |
 | 03:AGGREGATE        | 1      | 0ns      | 0ns      | 0       | 1          | 20.00 KB | 10.00 MB      |                       |
 | 02:NESTED LOOP JOIN | 1      | 17.62s   | 17.62s   | 81.14M  | 22.50B     | 3.23 MB  | 0 B           | CROSS JOIN, BROADCAST |
 | |--04:EXCHANGE      | 1      | 26.29ms  | 26.29ms  | 150.00K | 150.00K    | 0 B      | 0 B           | BROADCAST             |
 | |  01:SCAN HDFS     | 1      | 503.57ms | 503.57ms | 150.00K | 150.00K    | 24.09 MB | 64.00 MB      | tpch.customer t2      |
 | 00:SCAN HDFS        | 1      | 247.53ms | 247.53ms | 1.02K   | 150.00K    | 24.39 MB | 64.00 MB      | tpch.customer t1      |
 +---------------------+--------+----------+----------+---------+------------+----------+---------------+-----------------------+

 +---------------------+--------+----------+----------+---------+------------+----------+---------------+-----------------------+
 | Operator            | #Hosts | Avg Time | Max Time | #Rows   | Est. #Rows | Peak Mem | Est. Peak Mem | Detail                |
 +---------------------+--------+----------+----------+---------+------------+----------+---------------+-----------------------+
 | 06:AGGREGATE        | 0      | 0ns      | 0ns      | 0       | 1          | 0 B      | -1 B          | FINALIZE              |
 | 05:EXCHANGE         | 0      | 0ns      | 0ns      | 0       | 1          | 0 B      | -1 B          | UNPARTITIONED         |
 | 03:AGGREGATE        | 1      | 0ns      | 0ns      | 0       | 1          | 20.00 KB | 10.00 MB      |                       |
 | 02:NESTED LOOP JOIN | 1      | 61.85s   | 61.85s   | 283.43M | 22.50B     | 3.23 MB  | 0 B           | CROSS JOIN, BROADCAST |
 | |--04:EXCHANGE      | 1      | 26.29ms  | 26.29ms  | 150.00K | 150.00K    | 0 B      | 0 B           | BROADCAST             |
 | |  01:SCAN HDFS     | 1      | 503.57ms | 503.57ms | 150.00K | 150.00K    | 24.09 MB | 64.00 MB      | tpch.customer t2      |
 | 00:SCAN HDFS        | 1      | 247.59ms | 247.59ms | 2.05K   | 150.00K    | 24.39 MB | 64.00 MB      | tpch.customer t1      |
 +---------------------+--------+----------+----------+---------+------------+----------+---------------+-----------------------+
 ]]>
 </codeblock>

 <!-- Keeping this sample output that illustrates a couple of glitches in the LIVE_SUMMARY display, hidden, to help filing JIRAs. -->
 <codeblock audience="hidden"><![CDATA[[
 +---------------------+--------+----------+----------+---------+------------+----------+---------------+-----------------------+
 | Operator            | #Hosts | Avg Time | Max Time | #Rows   | Est. #Rows | Peak Mem | Est. Peak Mem | Detail                |
 +---------------------+--------+----------+----------+---------+------------+----------+---------------+-----------------------+
 | 06:AGGREGATE        | 0      | 0ns      | 0ns      | 0       | 1          | 0 B      | -1 B          | FINALIZE              |
 | 05:EXCHANGE         | 0      | 0ns      | 0ns      | 0       | 1          | 0 B      | -1 B          | UNPARTITIONED         |
 | 03:AGGREGATE        | 1      | 0ns      | 0ns      | 0       | 1          | 20.00 KB | 10.00 MB      |                       |
 | 02:NESTED LOOP JOIN | 1      | 91.34s   | 91.34s   | 419.48M | 22.50B     | 3.23 MB  | 0 B           | CROSS JOIN, BROADCAST |
 | |--04:EXCHANGE      | 1      | 26.29ms  | 26.29ms  | 150.00K | 150.00K    | 0 B      | 0 B           | BROADCAST             |
 | |  01:SCAN HDFS     | 1      | 503.57ms | 503.57ms | 150.00K | 150.00K    | 24.09 MB | 64.00 MB      | tpch.customer t2      |
 | 00:SCAN HDFS        | 1      | 247.63ms | 247.63ms | 3.07K   | 150.00K    | 24.39 MB | 64.00 MB      | tpch.customer t1      |
 +---------------------+--------+----------+----------+---------+------------+----------+---------------+-----------------------+

 +---------------------+--------+----------+----------+---------+------------+----------+---------------+-----------------------+
 | Operator            | #Hosts | Avg Time | Max Time | #Rows   | Est. #Rows | Peak Mem | Est. Peak Mem | Detail                |
 +---------------------+--------+----------+----------+---------+------------+----------+---------------+-----------------------+
 | 06:AGGREGATE        | 0      | 0ns      | 0ns      | 0       | 1          | 0 B      | -1 B          | FINALIZE              |
 | 05:EXCHANGE         | 0      | 0ns      | 0ns      | 0       | 1          | 0 B      | -1 B          | UNPARTITIONED         |
 | 03:AGGREGATE        | 1      | 0ns      | 0ns      | 0       | 1          | 20.00 KB | 10.00 MB      |                       |
 | 02:NESTED LOOP JOIN | 1      | 140.49s  | 140.49s  | 646.82M | 22.50B     | 3.23 MB  | 0 B           | CROSS JOIN, BROADCAST |
 | |--04:EXCHANGE      | 1      | 26.29ms  | 26.29ms  | 150.00K | 150.00K    | 0 B      | 0 B           | BROADCAST             |
 | |  01:SCAN HDFS     | 1      | 503.57ms | 503.57ms | 150.00K | 150.00K    | 24.09 MB | 64.00 MB      | tpch.customer t2      |
 | 00:SCAN HDFS        | 1      | 247.73ms | 247.73ms | 5.12K   | 150.00K    | 24.39 MB | 64.00 MB      | tpch.customer t1      |
 +---------------------+--------+----------+----------+---------+------------+----------+---------------+-----------------------+

 +---------------------+--------+----------+----------+---------+------------+----------+---------------+-----------------------+
 | Operator            | #Hosts | Avg Time | Max Time | #Rows   | Est. #Rows | Peak Mem | Est. Peak Mem | Detail                |
 +---------------------+--------+----------+----------+---------+------------+----------+---------------+-----------------------+
 | 06:AGGREGATE        | 0      | 0ns      | 0ns      | 0       | 1          | 0 B      | -1 B          | FINALIZE              |
 | 05:EXCHANGE         | 0      | 0ns      | 0ns      | 0       | 1          | 0 B      | -1 B          | UNPARTITIONED         |
 | 03:AGGREGATE        | 1      | 0ns      | 0ns      | 0       | 1          | 20.00 KB | 10.00 MB      |                       |
 | 02:NESTED LOOP JOIN | 1      | 228.96s  | 228.96s  | 1.06B   | 22.50B     | 3.23 MB  | 0 B           | CROSS JOIN, BROADCAST |
 | |--04:EXCHANGE      | 1      | 26.29ms  | 26.29ms  | 150.00K | 150.00K    | 0 B      | 0 B           | BROADCAST             |
 | |  01:SCAN HDFS     | 1      | 503.57ms | 503.57ms | 150.00K | 150.00K    | 24.09 MB | 64.00 MB      | tpch.customer t2      |
 | 00:SCAN HDFS        | 1      | 247.83ms | 247.83ms | 7.17K   | 150.00K    | 24.39 MB | 64.00 MB      | tpch.customer t1      |
 +---------------------+--------+----------+----------+---------+------------+----------+---------------+-----------------------+

 +---------------------+--------+----------+----------+---------+------------+----------+---------------+-----------------------+
 | Operator            | #Hosts | Avg Time | Max Time | #Rows   | Est. #Rows | Peak Mem | Est. Peak Mem | Detail                |
 +---------------------+--------+----------+----------+---------+------------+----------+---------------+-----------------------+
 | 06:AGGREGATE        | 0      | 0ns      | 0ns      | 0       | 1          | 0 B      | -1 B          | FINALIZE              |
 | 05:EXCHANGE         | 0      | 0ns      | 0ns      | 0       | 1          | 0 B      | -1 B          | UNPARTITIONED         |
 | 03:AGGREGATE        | 1      | 0ns      | 0ns      | 0       | 1          | 20.00 KB | 10.00 MB      |                       |
 | 02:NESTED LOOP JOIN | 1      | 563.11s  | 563.11s  | 2.59B   | 22.50B     | 3.23 MB  | 0 B           | CROSS JOIN, BROADCAST |
 | |--04:EXCHANGE      | 1      | 26.29ms  | 26.29ms  | 150.00K | 150.00K    | 0 B      | 0 B           | BROADCAST             |
 | |  01:SCAN HDFS     | 1      | 503.57ms | 503.57ms | 150.00K | 150.00K    | 24.09 MB | 64.00 MB      | tpch.customer t2      |
 | 00:SCAN HDFS        | 1      | 248.11ms | 248.11ms | 17.41K  | 150.00K    | 24.39 MB | 64.00 MB      | tpch.customer t1      |
 +---------------------+--------+----------+----------+---------+------------+----------+---------------+-----------------------+

 +---------------------+--------+----------+----------+---------+------------+----------+---------------+-----------------------+
 | Operator            | #Hosts | Avg Time | Max Time | #Rows   | Est. #Rows | Peak Mem | Est. Peak Mem | Detail                |
 +---------------------+--------+----------+----------+---------+------------+----------+---------------+-----------------------+
 | 06:AGGREGATE        | 0      | 0ns      | 0ns      | 0       | 1          | 0 B      | -1 B          | FINALIZE              |
 | 05:EXCHANGE         | 0      | 0ns      | 0ns      | 0       | 1          | 0 B      | -1 B          | UNPARTITIONED         |
 | 03:AGGREGATE        | 1      | 0ns      | 0ns      | 0       | 1          | 20.00 KB | 10.00 MB      |                       |
 | 02:NESTED LOOP JOIN | 1      | 985.71s  | 985.71s  | 4.54B   | 22.50B     | 3.23 MB  | 0 B           | CROSS JOIN, BROADCAST |
 | |--04:EXCHANGE      | 1      | 26.29ms  | 26.29ms  | 150.00K | 150.00K    | 0 B      | 0 B           | BROADCAST             |
 | |  01:SCAN HDFS     | 1      | 503.57ms | 503.57ms | 150.00K | 150.00K    | 24.09 MB | 64.00 MB      | tpch.customer t2      |
 | 00:SCAN HDFS        | 1      | 248.49ms | 248.49ms | 30.72K  | 150.00K    | 24.39 MB | 64.00 MB      | tpch.customer t1      |
 +---------------------+--------+----------+----------+---------+------------+----------+---------------+-----------------------+

 +---------------------+--------+----------+----------+---------+------------+----------+---------------+-----------------------+
 | Operator            | #Hosts | Avg Time | Max Time | #Rows   | Est. #Rows | Peak Mem | Est. Peak Mem | Detail                |
 +---------------------+--------+----------+----------+---------+------------+----------+---------------+-----------------------+
 | 06:AGGREGATE        | 0      | 0ns      | 0ns      | 0       | 1          | 0 B      | -1 B          | FINALIZE              |
 | 05:EXCHANGE         | 0      | 0ns      | 0ns      | 0       | 1          | 0 B      | -1 B          | UNPARTITIONED         |
 | 03:AGGREGATE        | 1      | 0ns      | 0ns      | 0       | 1          | 20.00 KB | 10.00 MB      |                       |
 | 02:NESTED LOOP JOIN | 1      | None     | None     | 5.42B   | 22.50B     | 3.23 MB  | 0 B           | CROSS JOIN, BROADCAST |
 | |--04:EXCHANGE      | 1      | 26.29ms  | 26.29ms  | 150.00K | 150.00K    | 0 B      | 0 B           | BROADCAST             |
 | |  01:SCAN HDFS     | 1      | 503.57ms | 503.57ms | 150.00K | 150.00K    | 24.09 MB | 64.00 MB      | tpch.customer t2      |
 | 00:SCAN HDFS        | 1      | 248.66ms | 248.66ms | 36.86K  | 150.00K    | 24.39 MB | 64.00 MB      | tpch.customer t1      |
 +---------------------+--------+----------+----------+---------+------------+----------+---------------+-----------------------+

 [localhost:21000] > select count(*) from customer t1 cross join customer t2;
 Query: select count(*) from customer t1 cross join customer t2
 [####################################################################################################] 100%
 +---------------------+--------+----------+----------+---------+------------+----------+---------------+-----------------------+
 | Operator            | #Hosts | Avg Time | Max Time | #Rows   | Est. #Rows | Peak Mem | Est. Peak Mem | Detail                |
 ]]>
 </codeblock>

     <p conref="../shared/impala_common.xml#common/live_progress_live_summary_asciinema"/>

   </conbody>
 </concept>
	<?xml version="1.0" encoding="UTF-8"?>
	<!--
	Licensed to the Apache Software Foundation (ASF) under one
	or more contributor license agreements. See the NOTICE file
	distributed with this work for additional information
	regarding copyright ownership. The ASF licenses this file
	to you under the Apache License, Version 2.0 (the
	"License"); you may not use this file except in compliance
	with the License. You may obtain a copy of the License at

	http://www.apache.org/licenses/LICENSE-2.0

	Unless required by applicable law or agreed to in writing,
	software distributed under the License is distributed on an
	"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
	KIND, either express or implied. See the License for the
	specific language governing permissions and limitations
	under the License.
	-->
	<!DOCTYPE concept PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
	<concept rev="2.3.0" id="live_summary">

	<title>LIVE_SUMMARY Query Option (<keyword keyref="impala23"/> or higher only)</title>
	<titlealts audience="PDF"><navtitle>LIVE_SUMMARY</navtitle></titlealts>
	<prolog>
	<metadata>
	<data name="Category" value="Impala"/>
	<data name="Category" value="Impala Query Options"/>
	<data name="Category" value="Querying"/>
	<data name="Category" value="Performance"/>
	<data name="Category" value="Reports"/>
	<data name="Category" value="impala-shell"/>
	<data name="Category" value="Developers"/>
	<data name="Category" value="Data Analysts"/>
	</metadata>
	</prolog>

	<conbody>

	<p rev="2.3.0">
	<indexterm audience="hidden">LIVE_SUMMARY query option</indexterm>
	For queries submitted through the <cmdname>impala-shell</cmdname> command,
	displays the same output as the <codeph>SUMMARY</codeph> command,
	with the measurements updated in real time as the query progresses.
	When the query finishes, the final <codeph>SUMMARY</codeph> output remains
	visible in the <cmdname>impala-shell</cmdname> console output.
	</p>

	<p>
	</p>

	<p conref="../shared/impala_common.xml#common/type_boolean"/>
	<p conref="../shared/impala_common.xml#common/default_false_0"/>

	<p conref="../shared/impala_common.xml#common/command_line_blurb"/>
	<p>
	You can enable this query option within <cmdname>impala-shell</cmdname>
	by starting the shell with the <codeph>--live_summary</codeph>
	command-line option.
	You can still turn this setting off and on again within the shell through the
	<codeph>SET</codeph> command.
	</p>

	<p conref="../shared/impala_common.xml#common/usage_notes_blurb"/>
	<p>
	The live summary output can be useful for evaluating long-running queries,
	to evaluate which phase of execution takes up the most time, or if some hosts
	take much longer than others for certain operations, dragging overall performance down.
	By making the information available in real time, this feature lets you decide what
	action to take even before you cancel a query that is taking much longer than normal.
	</p>
	<p>
	For example, you might see the HDFS scan phase taking a long time, and therefore revisit
	performance-related aspects of your schema design such as constructing a partitioned table,
	switching to the Parquet file format, running the <codeph>COMPUTE STATS</codeph> statement
	for the table, and so on.
	Or you might see a wide variation between the average and maximum times for all hosts to
	perform some phase of the query, and therefore investigate if one particular host
	needed more memory or was experiencing a network problem.
	</p>
	<p conref="../shared/impala_common.xml#common/live_reporting_details"/>
	<p>
	For a simple and concise way of tracking the progress of an interactive query, see
	<xref href="impala_live_progress.xml#live_progress"/>.
	</p>

	<p conref="../shared/impala_common.xml#common/restrictions_blurb"/>
	<p conref="../shared/impala_common.xml#common/impala_shell_progress_reports_compute_stats_caveat"/>
	<p conref="../shared/impala_common.xml#common/impala_shell_progress_reports_shell_only_caveat"/>

	<p conref="../shared/impala_common.xml#common/added_in_230"/>

	<p conref="../shared/impala_common.xml#common/example_blurb"/>

	<p>
	The following example shows a series of <codeph>LIVE_SUMMARY</codeph> reports that
	are displayed during the course of a query, showing how the numbers increase to
	show the progress of different phases of the distributed query. When you do the same
	in <cmdname>impala-shell</cmdname>, only a single report is displayed at any one time,
	with each update overwriting the previous numbers.
	</p>

	<codeblock><![CDATA[[localhost:21000] > set live_summary=true;
	LIVE_SUMMARY set to true
	[localhost:21000] > select count(*) from customer t1 cross join customer t2;
	+---------------------+--------+----------+----------+---------+------------+----------+---------------+-----------------------+
	\| Operator \| #Hosts \| Avg Time \| Max Time \| #Rows \| Est. #Rows \| Peak Mem \| Est. Peak Mem \| Detail \|
	+---------------------+--------+----------+----------+---------+------------+----------+---------------+-----------------------+
	\| 06:AGGREGATE \| 0 \| 0ns \| 0ns \| 0 \| 1 \| 0 B \| -1 B \| FINALIZE \|
	\| 05:EXCHANGE \| 0 \| 0ns \| 0ns \| 0 \| 1 \| 0 B \| -1 B \| UNPARTITIONED \|
	\| 03:AGGREGATE \| 0 \| 0ns \| 0ns \| 0 \| 1 \| 0 B \| 10.00 MB \| \|
	\| 02:NESTED LOOP JOIN \| 0 \| 0ns \| 0ns \| 0 \| 22.50B \| 0 B \| 0 B \| CROSS JOIN, BROADCAST \|
	\| \|--04:EXCHANGE \| 0 \| 0ns \| 0ns \| 0 \| 150.00K \| 0 B \| 0 B \| BROADCAST \|
	\| \| 01:SCAN HDFS \| 1 \| 503.57ms \| 503.57ms \| 150.00K \| 150.00K \| 24.09 MB \| 64.00 MB \| tpch.customer t2 \|
	\| 00:SCAN HDFS \| 0 \| 0ns \| 0ns \| 0 \| 150.00K \| 0 B \| 64.00 MB \| tpch.customer t1 \|
	+---------------------+--------+----------+----------+---------+------------+----------+---------------+-----------------------+

	+---------------------+--------+----------+----------+---------+------------+----------+---------------+-----------------------+
	\| Operator \| #Hosts \| Avg Time \| Max Time \| #Rows \| Est. #Rows \| Peak Mem \| Est. Peak Mem \| Detail \|
	+---------------------+--------+----------+----------+---------+------------+----------+---------------+-----------------------+
	\| 06:AGGREGATE \| 0 \| 0ns \| 0ns \| 0 \| 1 \| 0 B \| -1 B \| FINALIZE \|
	\| 05:EXCHANGE \| 0 \| 0ns \| 0ns \| 0 \| 1 \| 0 B \| -1 B \| UNPARTITIONED \|
	\| 03:AGGREGATE \| 1 \| 0ns \| 0ns \| 0 \| 1 \| 20.00 KB \| 10.00 MB \| \|
	\| 02:NESTED LOOP JOIN \| 1 \| 17.62s \| 17.62s \| 81.14M \| 22.50B \| 3.23 MB \| 0 B \| CROSS JOIN, BROADCAST \|
	\| \|--04:EXCHANGE \| 1 \| 26.29ms \| 26.29ms \| 150.00K \| 150.00K \| 0 B \| 0 B \| BROADCAST \|
	\| \| 01:SCAN HDFS \| 1 \| 503.57ms \| 503.57ms \| 150.00K \| 150.00K \| 24.09 MB \| 64.00 MB \| tpch.customer t2 \|
	\| 00:SCAN HDFS \| 1 \| 247.53ms \| 247.53ms \| 1.02K \| 150.00K \| 24.39 MB \| 64.00 MB \| tpch.customer t1 \|
	+---------------------+--------+----------+----------+---------+------------+----------+---------------+-----------------------+

	+---------------------+--------+----------+----------+---------+------------+----------+---------------+-----------------------+
	\| Operator \| #Hosts \| Avg Time \| Max Time \| #Rows \| Est. #Rows \| Peak Mem \| Est. Peak Mem \| Detail \|
	+---------------------+--------+----------+----------+---------+------------+----------+---------------+-----------------------+
	\| 06:AGGREGATE \| 0 \| 0ns \| 0ns \| 0 \| 1 \| 0 B \| -1 B \| FINALIZE \|
	\| 05:EXCHANGE \| 0 \| 0ns \| 0ns \| 0 \| 1 \| 0 B \| -1 B \| UNPARTITIONED \|
	\| 03:AGGREGATE \| 1 \| 0ns \| 0ns \| 0 \| 1 \| 20.00 KB \| 10.00 MB \| \|
	\| 02:NESTED LOOP JOIN \| 1 \| 61.85s \| 61.85s \| 283.43M \| 22.50B \| 3.23 MB \| 0 B \| CROSS JOIN, BROADCAST \|
	\| \|--04:EXCHANGE \| 1 \| 26.29ms \| 26.29ms \| 150.00K \| 150.00K \| 0 B \| 0 B \| BROADCAST \|
	\| \| 01:SCAN HDFS \| 1 \| 503.57ms \| 503.57ms \| 150.00K \| 150.00K \| 24.09 MB \| 64.00 MB \| tpch.customer t2 \|
	\| 00:SCAN HDFS \| 1 \| 247.59ms \| 247.59ms \| 2.05K \| 150.00K \| 24.39 MB \| 64.00 MB \| tpch.customer t1 \|
	+---------------------+--------+----------+----------+---------+------------+----------+---------------+-----------------------+
	]]>
	</codeblock>

	<!-- Keeping this sample output that illustrates a couple of glitches in the LIVE_SUMMARY display, hidden, to help filing JIRAs. -->
	<codeblock audience="hidden"><![CDATA[[
	+---------------------+--------+----------+----------+---------+------------+----------+---------------+-----------------------+
	\| Operator \| #Hosts \| Avg Time \| Max Time \| #Rows \| Est. #Rows \| Peak Mem \| Est. Peak Mem \| Detail \|
	+---------------------+--------+----------+----------+---------+------------+----------+---------------+-----------------------+
	\| 06:AGGREGATE \| 0 \| 0ns \| 0ns \| 0 \| 1 \| 0 B \| -1 B \| FINALIZE \|
	\| 05:EXCHANGE \| 0 \| 0ns \| 0ns \| 0 \| 1 \| 0 B \| -1 B \| UNPARTITIONED \|
	\| 03:AGGREGATE \| 1 \| 0ns \| 0ns \| 0 \| 1 \| 20.00 KB \| 10.00 MB \| \|
	\| 02:NESTED LOOP JOIN \| 1 \| 91.34s \| 91.34s \| 419.48M \| 22.50B \| 3.23 MB \| 0 B \| CROSS JOIN, BROADCAST \|
	\| \|--04:EXCHANGE \| 1 \| 26.29ms \| 26.29ms \| 150.00K \| 150.00K \| 0 B \| 0 B \| BROADCAST \|
	\| \| 01:SCAN HDFS \| 1 \| 503.57ms \| 503.57ms \| 150.00K \| 150.00K \| 24.09 MB \| 64.00 MB \| tpch.customer t2 \|
	\| 00:SCAN HDFS \| 1 \| 247.63ms \| 247.63ms \| 3.07K \| 150.00K \| 24.39 MB \| 64.00 MB \| tpch.customer t1 \|
	+---------------------+--------+----------+----------+---------+------------+----------+---------------+-----------------------+

	+---------------------+--------+----------+----------+---------+------------+----------+---------------+-----------------------+
	\| Operator \| #Hosts \| Avg Time \| Max Time \| #Rows \| Est. #Rows \| Peak Mem \| Est. Peak Mem \| Detail \|
	+---------------------+--------+----------+----------+---------+------------+----------+---------------+-----------------------+
	\| 06:AGGREGATE \| 0 \| 0ns \| 0ns \| 0 \| 1 \| 0 B \| -1 B \| FINALIZE \|
	\| 05:EXCHANGE \| 0 \| 0ns \| 0ns \| 0 \| 1 \| 0 B \| -1 B \| UNPARTITIONED \|
	\| 03:AGGREGATE \| 1 \| 0ns \| 0ns \| 0 \| 1 \| 20.00 KB \| 10.00 MB \| \|
	\| 02:NESTED LOOP JOIN \| 1 \| 140.49s \| 140.49s \| 646.82M \| 22.50B \| 3.23 MB \| 0 B \| CROSS JOIN, BROADCAST \|
	\| \|--04:EXCHANGE \| 1 \| 26.29ms \| 26.29ms \| 150.00K \| 150.00K \| 0 B \| 0 B \| BROADCAST \|
	\| \| 01:SCAN HDFS \| 1 \| 503.57ms \| 503.57ms \| 150.00K \| 150.00K \| 24.09 MB \| 64.00 MB \| tpch.customer t2 \|
	\| 00:SCAN HDFS \| 1 \| 247.73ms \| 247.73ms \| 5.12K \| 150.00K \| 24.39 MB \| 64.00 MB \| tpch.customer t1 \|
	+---------------------+--------+----------+----------+---------+------------+----------+---------------+-----------------------+

	+---------------------+--------+----------+----------+---------+------------+----------+---------------+-----------------------+
	\| Operator \| #Hosts \| Avg Time \| Max Time \| #Rows \| Est. #Rows \| Peak Mem \| Est. Peak Mem \| Detail \|
	+---------------------+--------+----------+----------+---------+------------+----------+---------------+-----------------------+
	\| 06:AGGREGATE \| 0 \| 0ns \| 0ns \| 0 \| 1 \| 0 B \| -1 B \| FINALIZE \|
	\| 05:EXCHANGE \| 0 \| 0ns \| 0ns \| 0 \| 1 \| 0 B \| -1 B \| UNPARTITIONED \|
	\| 03:AGGREGATE \| 1 \| 0ns \| 0ns \| 0 \| 1 \| 20.00 KB \| 10.00 MB \| \|
	\| 02:NESTED LOOP JOIN \| 1 \| 228.96s \| 228.96s \| 1.06B \| 22.50B \| 3.23 MB \| 0 B \| CROSS JOIN, BROADCAST \|
	\| \|--04:EXCHANGE \| 1 \| 26.29ms \| 26.29ms \| 150.00K \| 150.00K \| 0 B \| 0 B \| BROADCAST \|
	\| \| 01:SCAN HDFS \| 1 \| 503.57ms \| 503.57ms \| 150.00K \| 150.00K \| 24.09 MB \| 64.00 MB \| tpch.customer t2 \|
	\| 00:SCAN HDFS \| 1 \| 247.83ms \| 247.83ms \| 7.17K \| 150.00K \| 24.39 MB \| 64.00 MB \| tpch.customer t1 \|
	+---------------------+--------+----------+----------+---------+------------+----------+---------------+-----------------------+

	+---------------------+--------+----------+----------+---------+------------+----------+---------------+-----------------------+
	\| Operator \| #Hosts \| Avg Time \| Max Time \| #Rows \| Est. #Rows \| Peak Mem \| Est. Peak Mem \| Detail \|
	+---------------------+--------+----------+----------+---------+------------+----------+---------------+-----------------------+
	\| 06:AGGREGATE \| 0 \| 0ns \| 0ns \| 0 \| 1 \| 0 B \| -1 B \| FINALIZE \|
	\| 05:EXCHANGE \| 0 \| 0ns \| 0ns \| 0 \| 1 \| 0 B \| -1 B \| UNPARTITIONED \|
	\| 03:AGGREGATE \| 1 \| 0ns \| 0ns \| 0 \| 1 \| 20.00 KB \| 10.00 MB \| \|
	\| 02:NESTED LOOP JOIN \| 1 \| 563.11s \| 563.11s \| 2.59B \| 22.50B \| 3.23 MB \| 0 B \| CROSS JOIN, BROADCAST \|
	\| \|--04:EXCHANGE \| 1 \| 26.29ms \| 26.29ms \| 150.00K \| 150.00K \| 0 B \| 0 B \| BROADCAST \|
	\| \| 01:SCAN HDFS \| 1 \| 503.57ms \| 503.57ms \| 150.00K \| 150.00K \| 24.09 MB \| 64.00 MB \| tpch.customer t2 \|
	\| 00:SCAN HDFS \| 1 \| 248.11ms \| 248.11ms \| 17.41K \| 150.00K \| 24.39 MB \| 64.00 MB \| tpch.customer t1 \|
	+---------------------+--------+----------+----------+---------+------------+----------+---------------+-----------------------+

	+---------------------+--------+----------+----------+---------+------------+----------+---------------+-----------------------+
	\| Operator \| #Hosts \| Avg Time \| Max Time \| #Rows \| Est. #Rows \| Peak Mem \| Est. Peak Mem \| Detail \|
	+---------------------+--------+----------+----------+---------+------------+----------+---------------+-----------------------+
	\| 06:AGGREGATE \| 0 \| 0ns \| 0ns \| 0 \| 1 \| 0 B \| -1 B \| FINALIZE \|
	\| 05:EXCHANGE \| 0 \| 0ns \| 0ns \| 0 \| 1 \| 0 B \| -1 B \| UNPARTITIONED \|
	\| 03:AGGREGATE \| 1 \| 0ns \| 0ns \| 0 \| 1 \| 20.00 KB \| 10.00 MB \| \|
	\| 02:NESTED LOOP JOIN \| 1 \| 985.71s \| 985.71s \| 4.54B \| 22.50B \| 3.23 MB \| 0 B \| CROSS JOIN, BROADCAST \|
	\| \|--04:EXCHANGE \| 1 \| 26.29ms \| 26.29ms \| 150.00K \| 150.00K \| 0 B \| 0 B \| BROADCAST \|
	\| \| 01:SCAN HDFS \| 1 \| 503.57ms \| 503.57ms \| 150.00K \| 150.00K \| 24.09 MB \| 64.00 MB \| tpch.customer t2 \|
	\| 00:SCAN HDFS \| 1 \| 248.49ms \| 248.49ms \| 30.72K \| 150.00K \| 24.39 MB \| 64.00 MB \| tpch.customer t1 \|
	+---------------------+--------+----------+----------+---------+------------+----------+---------------+-----------------------+

	+---------------------+--------+----------+----------+---------+------------+----------+---------------+-----------------------+
	\| Operator \| #Hosts \| Avg Time \| Max Time \| #Rows \| Est. #Rows \| Peak Mem \| Est. Peak Mem \| Detail \|
	+---------------------+--------+----------+----------+---------+------------+----------+---------------+-----------------------+
	\| 06:AGGREGATE \| 0 \| 0ns \| 0ns \| 0 \| 1 \| 0 B \| -1 B \| FINALIZE \|
	\| 05:EXCHANGE \| 0 \| 0ns \| 0ns \| 0 \| 1 \| 0 B \| -1 B \| UNPARTITIONED \|
	\| 03:AGGREGATE \| 1 \| 0ns \| 0ns \| 0 \| 1 \| 20.00 KB \| 10.00 MB \| \|
	\| 02:NESTED LOOP JOIN \| 1 \| None \| None \| 5.42B \| 22.50B \| 3.23 MB \| 0 B \| CROSS JOIN, BROADCAST \|
	\| \|--04:EXCHANGE \| 1 \| 26.29ms \| 26.29ms \| 150.00K \| 150.00K \| 0 B \| 0 B \| BROADCAST \|
	\| \| 01:SCAN HDFS \| 1 \| 503.57ms \| 503.57ms \| 150.00K \| 150.00K \| 24.09 MB \| 64.00 MB \| tpch.customer t2 \|
	\| 00:SCAN HDFS \| 1 \| 248.66ms \| 248.66ms \| 36.86K \| 150.00K \| 24.39 MB \| 64.00 MB \| tpch.customer t1 \|
	+---------------------+--------+----------+----------+---------+------------+----------+---------------+-----------------------+

	[localhost:21000] > select count(*) from customer t1 cross join customer t2;
	Query: select count(*) from customer t1 cross join customer t2
	[####################################################################################################] 100%
	+---------------------+--------+----------+----------+---------+------------+----------+---------------+-----------------------+
	\| Operator \| #Hosts \| Avg Time \| Max Time \| #Rows \| Est. #Rows \| Peak Mem \| Est. Peak Mem \| Detail \|
	]]>
	</codeblock>

	<p conref="../shared/impala_common.xml#common/live_progress_live_summary_asciinema"/>

	</conbody>
	</concept>