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https://issues.apache.org/jira/browse/HBASE-5088?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13174623#comment-13174623
]
ramkrishna.s.vasudevan commented on HBASE-5088:
-----------------------------------------------
{code}
"WriterThread-2" prio=10 tid=0x00000000405cb000 nid=0x6a98 runnable
[0x00007fd0c18cf000]
java.lang.Thread.State: RUNNABLE
at org.apache.hadoop.hbase.util.Bytes.compareTo(Bytes.java:916)
at
org.apache.hadoop.hbase.util.Bytes$ByteArrayComparator.compare(Bytes.java:109)
at
org.apache.hadoop.hbase.util.Bytes$ByteArrayComparator.compare(Bytes.java:101)
at java.util.TreeMap.getEntryUsingComparator(TreeMap.java:351)
at java.util.TreeMap.getEntry(TreeMap.java:322)
at java.util.TreeMap.remove(TreeMap.java:580)
at
org.apache.hadoop.hbase.util.SoftValueSortedMap.checkReferences(SoftValueSortedMap.java:76)
at
org.apache.hadoop.hbase.util.SoftValueSortedMap.isEmpty(SoftValueSortedMap.java:150)
- locked <0x00007fd106cd6870> (a
org.apache.hadoop.hbase.util.SoftValueSortedMap)
at
org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.getCachedLocation(HConnectionManager.java:826)
at
org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegionInMeta(HConnectionManager.java:668)
at
org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegion(HConnectionManager.java:594)
at
org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.processBatch(HConnectionManager.java:1133)
at
org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.processBatchOfPuts(HConnectionManager.java:1253)
at org.apache.hadoop.hbase.client.HTable.flushCommits(HTable.java:828)
at org.apache.hadoop.hbase.client.HTable.doPut(HTable.java:684)
at org.apache.hadoop.hbase.client.HTable.put(HTable.java:674)
at
PerRegionLoadData$WriterThread.writeBuffer(PerRegionLoadData.java:350)
at PerRegionLoadData$WriterThread.doRun(PerRegionLoadData.java:314)
{code}
Once we got the above stack trace.. did not dig in much that time.. good finding
> A concurrency issue on SoftValueSortedMap
> -----------------------------------------
>
> Key: HBASE-5088
> URL: https://issues.apache.org/jira/browse/HBASE-5088
> Project: HBase
> Issue Type: Bug
> Components: client
> Affects Versions: 0.90.4, 0.94.0
> Reporter: Jieshan Bean
> Assignee: Jieshan Bean
>
> SoftValueSortedMap is backed by a TreeMap. All the methods in this class are
> synchronized. If we use this method to add/delete elements, it's ok.
> But in HConnectionManager#getCachedLocation, it use heapMap to get a view
> from SoftValueSortedMap#internalMap. Once we operate
> on this view map(like add/delete) in other threads, a concurrency issue may
> occur.
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