Sean Busbey created HADOOP-11969:
------------------------------------
Summary: Text encoder/decoder factory initialization are 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
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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