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https://issues.apache.org/jira/browse/HELIX-536?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14191154#comment-14191154
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Xia Lei commented on HELIX-536:
-------------------------------
The case was found in Espresso, when Espresso does rebalance, it resets
IdealState as:
idealState.setInstanceGroupTag(idealState.getInstanceGroupTag());
which causes the problem when the InstanceGroup is not set before, it ends up
shows "InstanceTagGroup":null in IdealState which is not acceptable by
Espresso.
Espresso may need to verify whether getInstanceGroup() return null, but Helix
should also check and ignore null value in case the caller does not check.
> IdealState should ignore null value for InstanceGroupTag.
> ---------------------------------------------------------
>
> Key: HELIX-536
> URL: https://issues.apache.org/jira/browse/HELIX-536
> Project: Apache Helix
> Issue Type: Bug
> Reporter: Xia Lei
>
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