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HDFS-16586. Purge FsDatasetAsyncDiskService threadgroup; it causes BP… (#4347) 

Remove the ThreadGroup used by executor factories; they are unused
and ThreadGroups auto-destroy when their Thread-member count goes to zero.
This behavior is incompatible with the configuration we have on the per-volume
executor which is set to let all threads die if no use inside the
keepalive time.
This commit is contained in:
Michael Stack 2022-05-25 17:02:28 -07:00 committed by GitHub
parent 8c492a1d65
commit ae9d671232
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1 changed files with 1 additions and 3 deletions
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hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsDatasetAsyncDiskService.java
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@ -73,7 +73,6 @@ class FsDatasetAsyncDiskService {
private final DataNode datanode;
private final FsDatasetImpl fsdatasetImpl;
private final ThreadGroup threadGroup;
private Map<String, ThreadPoolExecutor> executors
= new HashMap<String, ThreadPoolExecutor>();
private Map<String, Set<Long>> deletedBlockIds
@ -91,7 +90,6 @@ class FsDatasetAsyncDiskService {
FsDatasetAsyncDiskService(DataNode datanode, FsDatasetImpl fsdatasetImpl) {
this.datanode = datanode;
this.fsdatasetImpl = fsdatasetImpl;
this.threadGroup = new ThreadGroup(getClass().getSimpleName());
maxNumThreadsPerVolume = datanode.getConf().getInt(
DFSConfigKeys.DFS_DATANODE_FSDATASETASYNCDISK_MAX_THREADS_PER_VOLUME_KEY,
DFSConfigKeys.DFS_DATANODE_FSDATASETASYNCDISK_MAX_THREADS_PER_VOLUME_DEFAULT);
@ -110,7 +108,7 @@ class FsDatasetAsyncDiskService {
synchronized (this) {
thisIndex = counter++;
}
Thread t = new Thread(threadGroup, r);
Thread t = new Thread(r);
t.setName("Async disk worker #" + thisIndex +
" for volume " + volume);
return t;