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https://issues.apache.org/jira/browse/HBASE-20093?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16381204#comment-16381204
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Chia-Ping Tsai commented on HBASE-20093:
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Thanks [[email protected]] for the reports.
{quote}what if master runs 2.0 but some region servers are running 1.x ?
{quote}
The report from RS to Master is based on protobuf, and the new class
ServerMetricsImpl can process the protobuf request correctly.
{quote}java.lang.ClassCastException:
org.apache.hadoop.hbase.ServerMetricsBuilder$ServerMetricsImpl cannot be cast
to org.apache.hadoop.hbase.ServerLoad
at
org.apache.hadoop.hbase.master.HMaster.lambda$getClusterMetricsWithoutCoprocessor$2(HMaster.java:2438){quote}
The master won't use ServerLoad anymore (excluding
serverManager.checkAndRecordNewServer...I will push a addendum to fix it). Not
sure why casting still happen. How could I reproduce the error?
> Replace ServerLoad by ServerMetrics for ServerManager
> -----------------------------------------------------
>
> Key: HBASE-20093
> URL: https://issues.apache.org/jira/browse/HBASE-20093
> Project: HBase
> Issue Type: Task
> Reporter: Chia-Ping Tsai
> Assignee: Chia-Ping Tsai
> Priority: Major
> Fix For: 2.0.0
>
> Attachments: HBASE-20093.v0.patch, HBASE-20093.v1.patch
>
>
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