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https://issues.apache.org/jira/browse/HBASE-5088?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13174606#comment-13174606
]
Jieshan Bean commented on HBASE-5088:
-------------------------------------
We found this issue while one thread can't get out of the loop in
TreeMap#fixAfterDeletion:
{noformat}
"Thread-923" prio=10 tid=0x00007f3d40553000 nid=0x3ed6 runnable
[0x00007f3d05c1a000]
java.lang.Thread.State: RUNNABLE
at java.util.TreeMap.fixAfterDeletion(TreeMap.java:2193)
at java.util.TreeMap.deleteEntry(TreeMap.java:2151)
at java.util.TreeMap.remove(TreeMap.java:585)
at java.util.TreeMap$NavigableSubMap.remove(TreeMap.java:1395)
at
org.apache.hadoop.hbase.util.SoftValueSortedMap.get(SoftValueSortedMap.java:101)
- locked <0x00007f3d94f24f70> (a
org.apache.hadoop.hbase.util.SoftValueSortedMap)
at
org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.getCachedLocation(HConnectionManager.java:846)
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$HConnectionImplementation.locateRegion(HConnectionManager.java:559)
at
org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.getRegionLocation(HConnectionManager.java:416)
at
org.apache.hadoop.hbase.client.ServerCallable.instantiateServer(ServerCallable.java:57)
at
org.apache.hadoop.hbase.client.ScannerCallable.instantiateServer(ScannerCallable.java:63)
at
org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.getRegionServerWithRetries(HConnectionManager.java:1018)
at
org.apache.hadoop.hbase.client.HTable$ClientScanner.nextScanner(HTable.java:1104)
at
org.apache.hadoop.hbase.client.HTable$ClientScanner.initialize(HTable.java:1027)
at org.apache.hadoop.hbase.client.HTable.getScanner(HTable.java:535)
at
com.huawei.icbc.query.SingleTabQuery.querybatch(SingleTabQuery.java:197)
at
com.huawei.icbc.benchmark.SingleTabQueryAction.query(SingleTabQueryAction.java:181)
at framework.QueryThread.run(QueryThread.java:47)
{noformat}
> 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
>
> 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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