[incubator-iotdb] 01/01: fix merge stuck bug

[ejttianyu]

This is an automated email from the ASF dual-hosted git repository.

ejttianyu pushed a commit to branch fix_merge_stuck_bug
in repository https://gitbox.apache.org/repos/asf/incubator-iotdb.git

commit c598cb32b0635a9200c27e393ed4f7b1370821e5
Author: EJTTianyu <1653503...@qq.com>
AuthorDate: Thu Apr 30 13:10:15 2020 +0800

    fix merge stuck bug
---
 .../db/engine/storagegroup/StorageGroupProcessor.java      | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git 
a/server/src/main/java/org/apache/iotdb/db/engine/storagegroup/StorageGroupProcessor.java
 
b/server/src/main/java/org/apache/iotdb/db/engine/storagegroup/StorageGroupProcessor.java
index 4a6037b..1f226ac 100755
--- 
a/server/src/main/java/org/apache/iotdb/db/engine/storagegroup/StorageGroupProcessor.java
+++ 
b/server/src/main/java/org/apache/iotdb/db/engine/storagegroup/StorageGroupProcessor.java
@@ -1383,7 +1383,6 @@ public class StorageGroupProcessor {
 
   @SuppressWarnings("squid:S1141")
   private void updateMergeModification(TsFileResource seqFile) {
-    seqFile.getWriteQueryLock().writeLock().lock();
     try {
       // remove old modifications and write modifications generated during 
merge
       seqFile.removeModFile();
@@ -1401,8 +1400,6 @@ public class StorageGroupProcessor {
     } catch (IOException e) {
       logger.error("{} cannot clean the ModificationFile of {} after merge", 
storageGroupName,
           seqFile.getFile(), e);
-    } finally {
-      seqFile.getWriteQueryLock().writeLock().unlock();
     }
   }
 
@@ -1432,7 +1429,15 @@ public class StorageGroupProcessor {
 
     for (int i = 0; i < seqFiles.size(); i++) {
       TsFileResource seqFile = seqFiles.get(i);
-      mergeLock.writeLock().lock();
+      while (!seqFile.getWriteQueryLock().writeLock().tryLock() || 
!mergeLock.writeLock()
+          .tryLock()) {
+        if (seqFile.getWriteQueryLock().writeLock().isHeldByCurrentThread()) {
+          seqFile.getWriteQueryLock().writeLock().unlock();
+        }
+        if(mergeLock.writeLock().isHeldByCurrentThread()) {
+          mergeLock.writeLock().unlock();
+        }
+      }
       try {
         updateMergeModification(seqFile);
         if (i == seqFiles.size() - 1) {
@@ -1443,6 +1448,7 @@ public class StorageGroupProcessor {
         }
       } finally {
         mergeLock.writeLock().unlock();
+        seqFile.getWriteQueryLock().writeLock().unlock();
       }
     }
     logger.info("{} a merge task ends", storageGroupName);