[ https://issues.apache.org/jira/browse/HDFS-9250?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Xiao Chen updated HDFS-9250: ---------------------------- Attachment: (was: HDFS-9250.002.patch) > LocatedBlock#addCachedLoc may throw ArrayStoreException when cache is empty > --------------------------------------------------------------------------- > > Key: HDFS-9250 > URL: https://issues.apache.org/jira/browse/HDFS-9250 > Project: Hadoop HDFS > Issue Type: Bug > Components: HDFS > Reporter: Xiao Chen > Assignee: Xiao Chen > Attachments: HDFS-9250.001.patch, HDFS-9250.002.patch > > > We may see the following exception: > {noformat} > java.lang.ArrayStoreException > at java.util.ArrayList.toArray(ArrayList.java:389) > at > org.apache.hadoop.hdfs.protocol.LocatedBlock.addCachedLoc(LocatedBlock.java:205) > at > org.apache.hadoop.hdfs.server.namenode.CacheManager.setCachedLocations(CacheManager.java:907) > at > org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getBlockLocationsUpdateTimes(FSNamesystem.java:1974) > at > org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getBlockLocationsInt(FSNamesystem.java:1873) > {noformat} > The cause is that in LocatedBlock.java, when {{addCachedLoc}}: > - Passed in parameter {{loc}}, which is type {{DatanodeDescriptor}}, is added > to {{cachedList}} > - {{cachedList}} was assigned to {{EMPTY_LOCS}}, which is type > {{DatanodeInfoWithStorage}}. > Both {{DatanodeDescriptor}} and {{DatanodeInfoWithStorage}} are subclasses of > {{DatanodeInfo}} but do not inherit from each other, resulting in the > ArrayStoreException. -- This message was sent by Atlassian JIRA (v6.3.4#6332)