shuaiqi.guo created HDFS-17241:
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Summary: long write lock on active NN from rollEditLog()
Key: HDFS-17241
URL: https://issues.apache.org/jira/browse/HDFS-17241
Project: Hadoop HDFS
Issue Type: Bug
Components: namenode
Affects Versions: 3.1.2
Reporter: shuaiqi.guo
when standby NN triggering log roll on active NN and sending fsimage to active
NN at the same time, the active NN while hive a long write lock, which blocks
almost all requests. like:
{code:java}
INFO org.apache.hadoop.hdfs.server.namenode.FSNamesystem: FSNamesystem write
lock held for 27179 ms via java.lang.Thread.getStackTrace(Thread.java:1559)
org.apache.hadoop.util.StringUtils.getStackTrace(StringUtils.java:1032)
org.apache.hadoop.hdfs.server.namenode.FSNamesystemLock.writeUnlock(FSNamesystemLock.java:273)
org.apache.hadoop.hdfs.server.namenode.FSNamesystemLock.writeUnlock(FSNamesystemLock.java:235)
org.apache.hadoop.hdfs.server.namenode.FSNamesystem.writeUnlock(FSNamesystem.java:1617)
org.apache.hadoop.hdfs.server.namenode.FSNamesystem.rollEditLog(FSNamesystem.java:4663)
org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.rollEditLog(NameNodeRpcServer.java:1292)
org.apache.hadoop.hdfs.protocolPB.NamenodeProtocolServerSideTranslatorPB.rollEditLog(NamenodeProtocolServerSideTranslatorPB.java:146)
org.apache.hadoop.hdfs.protocol.proto.NamenodeProtocolProtos$NamenodeProtocolService$2.callBlockingMethod(NamenodeProtocolProtos.java:12974)
org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:523)
org.apache.hadoop.ipc.RPC$Server.call(RPC.java:991)
org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:872)
org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:818)
java.security.AccessController.doPrivileged(Native Method)
javax.security.auth.Subject.doAs(Subject.java:422)
org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1729)
org.apache.hadoop.ipc.Server$Handler.run(Server.java:2678)
{code}
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