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Posted to common-issues@hadoop.apache.org by "Sean Busbey (JIRA)" <ji...@apache.org> on 2015/05/14 16:06:59 UTC
[jira] [Work started] (HADOOP-11969) ThreadLocal initialization in
several classes is not thread safe
[ https://issues.apache.org/jira/browse/HADOOP-11969?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Work on HADOOP-11969 started by Sean Busbey.
--------------------------------------------
> ThreadLocal initialization in several classes is not thread safe
> ----------------------------------------------------------------
>
> Key: HADOOP-11969
> URL: https://issues.apache.org/jira/browse/HADOOP-11969
> Project: Hadoop Common
> Issue Type: Bug
> Components: io
> Reporter: Sean Busbey
> Assignee: Sean Busbey
> Priority: Critical
> Labels: thread-safety
>
> Right now, the initialization of hte thread local factories for encoder / decoder in Text are not marked final. This means they end up with a static initializer that is not guaranteed to be finished running before the members are visible.
> Under heavy contention, this means during initialization some users will get an NPE:
> {code}
> (2015-05-05 08:58:03.974 : solr_server_log.log)
> org.apache.solr.common.SolrException; null:java.lang.NullPointerException
> at org.apache.hadoop.io.Text.decode(Text.java:406)
> at org.apache.hadoop.io.Text.decode(Text.java:389)
> at org.apache.hadoop.io.Text.toString(Text.java:280)
> at org.apache.hadoop.hdfs.protocolPB.PBHelper.convert(PBHelper.java:764)
> at org.apache.hadoop.hdfs.protocol.datatransfer.DataTransferProtoUtil.buildBaseHeader(DataTransferProtoUtil.java:81)
> at org.apache.hadoop.hdfs.protocol.datatransfer.DataTransferProtoUtil.buildClientHeader(DataTransferProtoUtil.java:71)
> at org.apache.hadoop.hdfs.protocol.datatransfer.Sender.readBlock(Sender.java:101)
> at org.apache.hadoop.hdfs.RemoteBlockReader2.newBlockReader(RemoteBlockReader2.java:400)
> at org.apache.hadoop.hdfs.BlockReaderFactory.getRemoteBlockReader(BlockReaderFactory.java:785)
> at org.apache.hadoop.hdfs.BlockReaderFactory.getRemoteBlockReaderFromTcp(BlockReaderFactory.java:663)
> at org.apache.hadoop.hdfs.BlockReaderFactory.build(BlockReaderFactory.java:327)
> at org.apache.hadoop.hdfs.DFSInputStream.actualGetFromOneDataNode(DFSInputStream.java:1027)
> at org.apache.hadoop.hdfs.DFSInputStream.fetchBlockByteRange(DFSInputStream.java:974)
> at org.apache.hadoop.hdfs.DFSInputStream.read(DFSInputStream.java:1305)
> at org.apache.hadoop.fs.FSInputStream.readFully(FSInputStream.java:78)
> at org.apache.hadoop.fs.FSDataInputStream.readFully(FSDataInputStream.java:107)
> ... SNIP...
> {code}
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