in_tail: create stream_id by file inode(#4190)

If stream_id is created by filename, rotated file id will be same. It causes releasing new multiline instance after file rotation. Signed-off-by: Takahiro Yamashita <[email protected]>
fluent · Oct 26, 2021 · 4725fb2 · 4725fb2
1 parent 5eb5658
commit 4725fb2
Showing 1 changed file with 15 additions and 2 deletions.
diff --git a/plugins/in_tail/tail_file.c b/plugins/in_tail/tail_file.c
@@ -795,6 +795,7 @@ int flb_tail_file_append(char *path, struct stat *st, int mode,
     size_t tag_len;
     struct flb_tail_file *file;
     struct stat lst;
+    flb_sds_t inode_str;
 
     if (!S_ISREG(st->st_mode)) {
         return -1;
@@ -882,18 +883,30 @@ int flb_tail_file_append(char *path, struct stat *st, int mode,
 
     /* Multiline core mode */
     if (ctx->ml_ctx) {
+        /*
+         * Create inode str to get stream_id.
+         *
+         * If stream_id is created by filename,
+         * it will be same after file rotation and it causes invalid destruction.
+         * https://github.com/fluent/fluent-bit/issues/4190
+         *
+         */
+        inode_str = flb_sds_create_size(64);
+        flb_sds_printf(&inode_str, "%"PRIu64, file->inode);
         /* Create a stream for this file */
         ret = flb_ml_stream_create(ctx->ml_ctx,
-                                   file->name, file->name_len,
+                                   inode_str, flb_sds_len(inode_str),
                                    ml_flush_callback, file,
                                    &stream_id);
         if (ret != 0) {
             flb_plg_error(ctx->ins,
                           "could not create multiline stream for file: %s",
-                          file->name);
+                          inode_str);
+            flb_sds_destroy(inode_str);
             goto error;
         }
         file->ml_stream_id = stream_id;
+        flb_sds_destroy(inode_str);
     }
 
     /* Local buffer */