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https://issues.apache.org/jira/browse/HBASE-8337?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13636997#comment-13636997
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Jonathan Hsieh commented on HBASE-8337:
---------------------------------------
Chatted with [~cmccabe]. There are essentially three options. 1) disable scr.
2) enable old-style insecure scr. 3) enable new-style (hadoop3 / CDH4.0) scr.
* check for native code enabled and classloader knows about
BlockReaderLocalLegacy => new style SCR
* else => old style SCR
* configuring new-style SCR
** dfs.client.read.shortcircuit = true
** dfs.client.read.shortcircuit.skip.checksum = false
** call DomainSocket.disableBindPathValidation();
** new TemporarySocketDirectory()
*** dfs.domain.socket.path = tempSockDir.getPath();
* configuring old-style (insecure) SCR
** dfs.client.read.shortcircuit = true
** dfs.client.read.shortcircuit.skip.checksum = false
** dfs.block.local-path-access.user = <comma-separated list of usernames
that will be used to access>
** dfs.datanode.data.dir.perm = 755
> Investigate why disabling hadoop short circuit read is required to make
> recovery tests pass consistently under hadoop2
> ----------------------------------------------------------------------------------------------------------------------
>
> Key: HBASE-8337
> URL: https://issues.apache.org/jira/browse/HBASE-8337
> Project: HBase
> Issue Type: Sub-task
> Components: hadoop2, test
> Affects Versions: 0.98.0, 0.95.1
> Reporter: Jonathan Hsieh
> Priority: Critical
> Fix For: 0.95.1
>
>
> HBASE-7636 makes some TestDistributedLogSplitting pass consistently by
> disabling hdfs short circuit reads.
> HBASE-8349 makes datanode node death recovery pass consistently by disabling
> hdfs short circuit reads.
> This will likely require configuration modifications to fix and may have
> different fixes for hadoop1, hadoop2 (HDFS-2246), and hadoop3 (HDFS-347)...
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