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MINOR: Fix typo and rephrase content in ops docs (#8581) 

1. fix typo: `atleast` -> `at least`
2. add missing `--` from `--bootstrap-servers` argument to be consistent
3. rephrase a sentence, to make it more clear:

before: `LinkedIn is currently running JDK 1.8 u5 (looking to upgrade to a newer version) with the G1 collector`

It will misguide the users to use JDK 1.8 u5, while the JDK 1.8 u251 is already released, which will include many important bug fixes. I did some rephrase as below:

after: `At the time this is written, LinkedIn is running JDK 1.8 u5 (looking to upgrade to a newer version) with the G1 collector`

Reviewers: Konstantine Karantasis <konstantine@confluent.io>
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showuon 2020-04-30 14:06:21 +08:00 committed by GitHub
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@ -229,7 +229,7 @@
</ul>
<p>
--reset-offsets also has following scenarios to choose from (atleast one scenario must be selected):
--reset-offsets also has following scenarios to choose from (at least one scenario must be selected):
<ul>
<li>
--to-datetime &lt;String: datetime&gt; : Reset offsets to offsets from datetime. Format: 'YYYY-MM-DDTHH:mm:SS.sss'
@ -273,7 +273,7 @@
<p>
If you are using the old high-level consumer and storing the group metadata in ZooKeeper (i.e. <code>offsets.storage=zookeeper</code>), pass
<code>--zookeeper</code> instead of <code>bootstrap-server</code>:
<code>--zookeeper</code> instead of <code>--bootstrap-server</code>:
<pre class="brush: bash;">
&gt; bin/kafka-consumer-groups.sh --zookeeper localhost:2181 --list
@ -676,7 +676,7 @@
From a security perspective, we recommend you use the latest released version of JDK 1.8 as older freely available versions have disclosed security vulnerabilities.
LinkedIn is currently running JDK 1.8 u5 (looking to upgrade to a newer version) with the G1 collector. LinkedIn's tuning looks like this:
At the time this is written, LinkedIn is running JDK 1.8 u5 (looking to upgrade to a newer version) with the G1 collector. LinkedIn's tuning looks like this:
<pre class="brush: text;">
-Xmx6g -Xms6g -XX:MetaspaceSize=96m -XX:+UseG1GC
-XX:MaxGCPauseMillis=20 -XX:InitiatingHeapOccupancyPercent=35 -XX:G1HeapRegionSize=16M