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https://issues.apache.org/jira/browse/HBASE-9108?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13745971#comment-13745971
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Enis Soztutar commented on HBASE-9108:
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I am not sure ignoring exceptions is the right way to do the test. Agreed that
on CM actions which cause extended unavailability, LoadTestTool will fail the
write. But shouldn't that be an actual error that either the CM is acting very
aggressively, or the cluster does not recover from errors quick enough causing
poor MTTR.
> LoadTestTool need to have a way to ignore keys which were failed during
> write.
> -------------------------------------------------------------------------------
>
> Key: HBASE-9108
> URL: https://issues.apache.org/jira/browse/HBASE-9108
> Project: HBase
> Issue Type: Improvement
> Components: test
> Affects Versions: 0.95.0, 0.95.1, 0.94.9, 0.94.10
> Reporter: gautam
> Assignee: gautam
> Priority: Critical
> Attachments: 9108.patch._trunk.5, 9108.patch._trunk.6,
> HBASE-9108.patch._trunk.2, HBASE-9108.patch._trunk.3,
> HBASE-9108.patch._trunk.4, HBASE-9108.patch._trunk.7,
> HBASE-9108.patch._trunk.8
>
> Original Estimate: 48h
> Remaining Estimate: 48h
>
> While running the chaosmonkey integration tests, it is found that write
> sometimes fails when the cluster components are restarted/stopped/killed etc..
> The data key which was being put, using the LoadTestTool, is added to the
> failed key set, and at the end of the test, this failed key set is checked
> for any entries to assert failures.
> While doing fail-over testing, it is expected that some of the keys may go
> un-written. The point here is to validate that whatever gets into hbase for
> an unstable cluster really goes in, and hence read should be 100% for
> whatever keys went in successfully.
> Currently LoadTestTool has strict checks to validate every key being written
> or not. In case any keys is not written, it fails.
> I wanted to loosen this constraint by allowing users to pass in a set of
> exceptions they expect when doing put/write operations over hbase. If one of
> these expected exception set is thrown while writing key to hbase, the failed
> key would be ignored, and hence wont even be considered again for subsequent
> write as well as read.
> This can be passed to the load test tool as csv list parameter
> -allowed_write_exceptions, or it can be passed through hbase-site.xml by
> writing a value for "test.ignore.exceptions.during.write"
> Here is the usage:
> -allowed_write_exceptions
> "java.io.EOFException,org.apache.hadoop.hbase.NotServingRegionException,org.apache.hadoop.hbase.client.NoServerForRegionException,org.apache.hadoop.hbase.ipc.ServerNotRunningYetException"
> Hence, by doing this the existing integration tests can also make use of this
> change by passing it as property in hbase-site.xml, as well.
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