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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-12419) "Partial cell read caused by EOF" ERRORs on replication source during replication
Date Thu, 06 Nov 2014 00:59:34 GMT

    [ https://issues.apache.org/jira/browse/HBASE-12419?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14199500#comment-14199500
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Andrew Purtell commented on HBASE-12419:
----------------------------------------

bq. Are there cases where we rely on this LOG.error to show that something went wrong?

I think BaseDecoder throwing an EOFException is good enough notice.

Thanks for the +1 for the idea [~jdcryans], I'll put up a patch that does exactly as specified
on this issue and commit it to 0.98+ later tonight unless there's an objection.

> "Partial cell read caused by EOF" ERRORs on replication source during replication
> ---------------------------------------------------------------------------------
>
>                 Key: HBASE-12419
>                 URL: https://issues.apache.org/jira/browse/HBASE-12419
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 0.98.7
>            Reporter: Andrew Purtell
>             Fix For: 2.0.0, 0.98.8, 0.99.2
>
>         Attachments: TestReplicationIngest.patch
>
>
> We are seeing exceptions like these on the replication sources when replication is active:
> {noformat}
> 2014-11-04 01:20:19,738 ERROR [regionserver8120-EventThread.replicationSource,1] codec.BaseDecoder:
> Partial cell read caused by EOF: java.io.IOException: Premature EOF from inputStream
> {noformat}
> HBase 0.98.8-SNAPSHOT, Hadoop 2.4.1.
> Happens both with and without short circuit reads on the source cluster.
> I'm able to reproduce this reliably:
> # Set up two clusters. Can be single slave.
> # Enable replication in configuration
> # Use LoadTestTool -init_only on both clusters
> # On source cluster via shell: alter 'cluster_test',{NAME=>'test_cf',REPLICATION_SCOPE=>1}
> # On source cluster via shell: add_peer 'remote:port:/hbase'
> # On source cluster, LoadTestTool -skip_init -write 1:1024:10 -num_keys 1000000
> # Wait for LoadTestTool to complete
> # Use the shell to verify 1M rows are in 'cluster_test' on the target cluster.
> All 1M rows will replicate without data loss, but I'll see 5-15 instances of "Partial
cell read caused by EOF" messages logged from codec.BaseDecoder at ERROR level on the replication
source. 



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