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From "Phil Yang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-15378) Scanner can not handle a heartbeat message with no results
Date Wed, 02 Mar 2016 06:04:18 GMT

    [ https://issues.apache.org/jira/browse/HBASE-15378?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15175100#comment-15175100
] 

Phil Yang commented on HBASE-15378:
-----------------------------------

{quote}
Does the class have to be public ?
{quote}
It seems that this filter will be serialized by protobuf and if I set it to non-public there
will be an exception like this:

{quote}
Caused by: java.lang.IllegalAccessException: Class org.apache.hadoop.hbase.protobuf.ProtobufUtil
can not access a member of class org.apache.hadoop.hbase.regionserver.TestScannerHeartbeatMessages$SparseFilter
with modifiers "public static"
	at sun.reflect.Reflection.ensureMemberAccess(Reflection.java:109)
	at java.lang.reflect.AccessibleObject.slowCheckMemberAccess(AccessibleObject.java:261)
{quote}

> Scanner can not handle a heartbeat message with no results
> ----------------------------------------------------------
>
>                 Key: HBASE-15378
>                 URL: https://issues.apache.org/jira/browse/HBASE-15378
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 1.2.0, 1.1.3
>            Reporter: Phil Yang
>            Assignee: Phil Yang
>            Priority: Critical
>         Attachments: HBASE-15378-v1.txt, HBASE-15378-v2.txt
>
>
> When a RS scanner get a TIME_LIMIT_REACHED_MID_ROW state, they will stop scanning and
send back what it has read to client and mark the message as a heartbeat message. If there
is no cell has been read, it will be an empty response. 
> However, ClientScanner only handles the situation that the client gets an empty heartbeat
and its cache is not empty. If the cache is empty too, it will be regarded as end-of-region
and open a new scanner for next region.



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